Windows Driver Development | windows driver samples | USBView sample application | C++

Sample Code

windows driver samples/ USBView sample application/ C++/ enum.c/

/*++
 
Copyright (c) 1997-2011 Microsoft Corporation
 
Module Name:
 
    ENUM.C
 
Abstract:
 
    This source file contains the routines which enumerate the USB bus
    and populate the TreeView control.
 
    The enumeration process goes like this:
 
    (1) Enumerate Host Controllers and Root Hubs
    EnumerateHostControllers()
    EnumerateHostController()
    Host controllers currently have symbolic link names of the form HCDx,
    where x starts at 0.  Use CreateFile() to open each host controller
    symbolic link.  Create a node in the TreeView to represent each host
    controller.
 
    GetRootHubName()
    After a host controller has been opened, send the host controller an
    IOCTL_USB_GET_ROOT_HUB_NAME request to get the symbolic link name of
    the root hub that is part of the host controller.
 
    (2) Enumerate Hubs (Root Hubs and External Hubs)
    EnumerateHub()
    Given the name of a hub, use CreateFile() to map the hub.  Send the
    hub an IOCTL_USB_GET_NODE_INFORMATION request to get info about the
    hub, such as the number of downstream ports.  Create a node in the
    TreeView to represent each hub.
 
    (3) Enumerate Downstream Ports
    EnumerateHubPorts()
    Given an handle to an open hub and the number of downstream ports on
    the hub, send the hub an IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX
    request for each downstream port of the hub to get info about the
    device (if any) attached to each port.  If there is a device attached
    to a port, send the hub an IOCTL_USB_GET_NODE_CONNECTION_NAME request
    to get the symbolic link name of the hub attached to the downstream
    port.  If there is a hub attached to the downstream port, recurse to
    step (2).  
     
    GetAllStringDescriptors()
    GetConfigDescriptor()
    Create a node in the TreeView to represent each hub port
    and attached device.
 
 
Environment:
 
    user mode
 
Revision History:
 
    04-25-97 : created
 
--*/
 
//*****************************************************************************
// I N C L U D E S
//*****************************************************************************
 
#include "uvcview.h"
 
//*****************************************************************************
// D E F I N E S
//*****************************************************************************
 
#define NUM_STRING_DESC_TO_GET 32
 
//*****************************************************************************
// L O C A L    F U N C T I O N    P R O T O T Y P E S
//*****************************************************************************
 
VOID
EnumerateHostControllers (
    HTREEITEM  hTreeParent,
    ULONG     *DevicesConnected
);
 
VOID
EnumerateHostController (
    HTREEITEM                hTreeParent,
    HANDLE                   hHCDev,
    _Inout_ PCHAR            leafName,
    _In_    HANDLE           deviceInfo,
    _In_    PSP_DEVINFO_DATA deviceInfoData
);
 
VOID
EnumerateHub (
    HTREEITEM                                       hTreeParent,
    _In_reads_(cbHubName) PCHAR                     HubName,
    _In_ size_t                                     cbHubName,
    _In_opt_ PUSB_NODE_CONNECTION_INFORMATION_EX    ConnectionInfo,
    _In_opt_ PUSB_NODE_CONNECTION_INFORMATION_EX_V2 ConnectionInfoV2,
    _In_opt_ PUSB_PORT_CONNECTOR_PROPERTIES         PortConnectorProps,
    _In_opt_ PUSB_DESCRIPTOR_REQUEST                ConfigDesc,
    _In_opt_ PUSB_DESCRIPTOR_REQUEST                BosDesc,
    _In_opt_ PSTRING_DESCRIPTOR_NODE                StringDescs,
    _In_opt_ PUSB_DEVICE_PNP_STRINGS                DevProps
);
 
VOID
EnumerateHubPorts (
    HTREEITEM   hTreeParent,
    HANDLE      hHubDevice,
    ULONG       NumPorts
);
 
PCHAR GetRootHubName (
    HANDLE HostController
);
 
PCHAR GetExternalHubName (
    HANDLE  Hub,
    ULONG   ConnectionIndex
);
 
PCHAR GetHCDDriverKeyName (
    HANDLE  HCD
);
 
PCHAR GetDriverKeyName (
    HANDLE  Hub,
    ULONG   ConnectionIndex
);
 
PUSB_DESCRIPTOR_REQUEST
GetConfigDescriptor (
    HANDLE  hHubDevice,
    ULONG   ConnectionIndex,
    UCHAR   DescriptorIndex
    );
 
PUSB_DESCRIPTOR_REQUEST
GetBOSDescriptor (
    HANDLE  hHubDevice,
    ULONG   ConnectionIndex
    );
 
DWORD
GetHostControllerPowerMap(
    HANDLE hHCDev, 
    PUSBHOSTCONTROLLERINFO hcInfo);
 
DWORD
GetHostControllerInfo(
    HANDLE hHCDev, 
    PUSBHOSTCONTROLLERINFO hcInfo);
 
PCHAR WideStrToMultiStr ( 
     _In_reads_bytes_(cbWideStr) PWCHAR WideStr, 
     _In_ size_t                   cbWideStr
     );
 
BOOL
AreThereStringDescriptors (
    PUSB_DEVICE_DESCRIPTOR          DeviceDesc,
    PUSB_CONFIGURATION_DESCRIPTOR   ConfigDesc
);
 
PSTRING_DESCRIPTOR_NODE
GetAllStringDescriptors (
    HANDLE                          hHubDevice,
    ULONG                           ConnectionIndex,
    PUSB_DEVICE_DESCRIPTOR          DeviceDesc,
    PUSB_CONFIGURATION_DESCRIPTOR   ConfigDesc
);
 
PSTRING_DESCRIPTOR_NODE
GetStringDescriptor (
    HANDLE  hHubDevice,
    ULONG   ConnectionIndex,
    UCHAR   DescriptorIndex,
    USHORT  LanguageID
);
 
HRESULT
GetStringDescriptors (
    _In_ HANDLE                         hHubDevice,
    _In_ ULONG                          ConnectionIndex,
    _In_ UCHAR                          DescriptorIndex,
    _In_ ULONG                          NumLanguageIDs,
    _In_reads_(NumLanguageIDs) USHORT  *LanguageIDs,
    _In_ PSTRING_DESCRIPTOR_NODE        StringDescNodeHead
);
 
void
EnumerateAllDevices();
 
 
void
EnumerateAllDevicesWithGuid(
    PDEVICE_GUID_LIST DeviceList, 
    LPGUID Guid
    );
 
void
FreeDeviceInfoNode(
    _In_ PDEVICE_INFO_NODE *ppNode
    );
 
PDEVICE_INFO_NODE
FindMatchingDeviceNodeForDriverName(
    _In_ PSTR    DriverKeyName,
    _In_ BOOLEAN IsHub
    );
 
 
//*****************************************************************************
// G L O B A L S
//*****************************************************************************
 
// List of enumerated host controllers.
//
LIST_ENTRY EnumeratedHCListHead =
{
    &EnumeratedHCListHead,
    &EnumeratedHCListHead
};
 
DEVICE_GUID_LIST gHubList;
DEVICE_GUID_LIST gDeviceList;
 
 
//*****************************************************************************
// G L O B A L S    P R I V A T E    T O    T H I S    F I L E
//*****************************************************************************
 
PCHAR ConnectionStatuses[] =
{
    "",                   // 0  - NoDeviceConnected
    "",                   // 1  - DeviceConnected
    "FailedEnumeration",  // 2  - DeviceFailedEnumeration
    "GeneralFailure",     // 3  - DeviceGeneralFailure
    "Overcurrent",        // 4  - DeviceCausedOvercurrent
    "NotEnoughPower",     // 5  - DeviceNotEnoughPower
    "NotEnoughBandwidth", // 6  - DeviceNotEnoughBandwidth
    "HubNestedTooDeeply", // 7  - DeviceHubNestedTooDeeply
    "InLegacyHub",        // 8  - DeviceInLegacyHub
    "Enumerating",        // 9  - DeviceEnumerating
    "Reset"               // 10 - DeviceReset
};
 
ULONG TotalDevicesConnected;
 
 
//*****************************************************************************
//
// EnumerateHostControllers()
//
// hTreeParent - Handle of the TreeView item under which host controllers
// should be added.
//
//*****************************************************************************
 
VOID
EnumerateHostControllers (
    HTREEITEM  hTreeParent,
    ULONG     *DevicesConnected
)
{
    HANDLE                           hHCDev = NULL;
    HDEVINFO                         deviceInfo = NULL;
    SP_DEVINFO_DATA                  deviceInfoData;
    SP_DEVICE_INTERFACE_DATA         deviceInterfaceData;
    PSP_DEVICE_INTERFACE_DETAIL_DATA deviceDetailData = NULL;
    ULONG                            index = 0;
    ULONG                            requiredLength = 0;
    BOOL                             success;
 
    TotalDevicesConnected = 0;
    TotalHubs = 0;
 
    EnumerateAllDevices();
 
    // Iterate over host controllers using the new GUID based interface
    //
    deviceInfo = SetupDiGetClassDevs((LPGUID)&GUID_CLASS_USB_HOST_CONTROLLER,
                                     NULL,
                                     NULL,
                                     (DIGCF_PRESENT | DIGCF_DEVICEINTERFACE));
 
    deviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
 
    for (index=0;
         SetupDiEnumDeviceInfo(deviceInfo,
                               index,
                               &deviceInfoData);
         index++)
    {
        deviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
 
        success = SetupDiEnumDeviceInterfaces(deviceInfo,
                                              0,
                                              (LPGUID)&GUID_CLASS_USB_HOST_CONTROLLER,
                                              index,
                                              &deviceInterfaceData);
 
        if (!success)
        {
            OOPS();
            break;
        }
 
        success = SetupDiGetDeviceInterfaceDetail(deviceInfo,
                                                  &deviceInterfaceData,
                                                  NULL,
                                                  0,
                                                  &requiredLength,
                                                  NULL);
 
        if (!success && GetLastError() != ERROR_INSUFFICIENT_BUFFER)
        {
            OOPS();
            break;
        }
 
        deviceDetailData = ALLOC(requiredLength);
        if (deviceDetailData == NULL)
        {
            OOPS();
            break;
        }
 
        deviceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
 
        success = SetupDiGetDeviceInterfaceDetail(deviceInfo,
                                                  &deviceInterfaceData,
                                                  deviceDetailData,
                                                  requiredLength,
                                                  &requiredLength,
                                                  NULL);
 
        if (!success)
        {
            OOPS();
            break;
        }
 
        hHCDev = CreateFile(deviceDetailData->DevicePath,
                            GENERIC_WRITE,
                            FILE_SHARE_WRITE,
                            NULL,
                            OPEN_EXISTING,
                            0,
                            NULL);
 
        // If the handle is valid, then we've successfully opened a Host
        // Controller.  Display some info about the Host Controller itself,
        // then enumerate the Root Hub attached to the Host Controller.
        //
        if (hHCDev != INVALID_HANDLE_VALUE)
        {
            EnumerateHostController(hTreeParent,
                                    hHCDev,
                                    deviceDetailData->DevicePath,
                                    deviceInfo,
                                    &deviceInfoData);
 
            CloseHandle(hHCDev);
        }
 
        FREE(deviceDetailData);
    }
 
    SetupDiDestroyDeviceInfoList(deviceInfo);
 
    *DevicesConnected = TotalDevicesConnected;
 
    return;
}
 
//*****************************************************************************
//
// EnumerateHostController()
//
// hTreeParent - Handle of the TreeView item under which host controllers
// should be added.
//
//*****************************************************************************
 
VOID
EnumerateHostController (
    HTREEITEM                hTreeParent,
    HANDLE                   hHCDev,    _Inout_ PCHAR            leafName,
    _In_    HANDLE           deviceInfo,
    _In_    PSP_DEVINFO_DATA deviceInfoData
)
{
    PCHAR                   driverKeyName = NULL;
    HTREEITEM               hHCItem = NULL;
    PCHAR                   rootHubName = NULL;
    PLIST_ENTRY             listEntry = NULL;
    PUSBHOSTCONTROLLERINFO  hcInfo = NULL;
    PUSBHOSTCONTROLLERINFO  hcInfoInList = NULL;
    DWORD                   dwSuccess;
    BOOL                    success = FALSE;
    ULONG                   deviceAndFunction = 0;
    PUSB_DEVICE_PNP_STRINGS DevProps = NULL;
 
 
    // Allocate a structure to hold information about this host controller.
    //
    hcInfo = (PUSBHOSTCONTROLLERINFO)ALLOC(sizeof(USBHOSTCONTROLLERINFO));
 
    // just return if could not alloc memory
    if (NULL == hcInfo)
        return;
 
    hcInfo->DeviceInfoType = HostControllerInfo;
 
    // Obtain the driver key name for this host controller.
    //
    driverKeyName = GetHCDDriverKeyName(hHCDev);
 
    if (NULL == driverKeyName)
    {
        // Failure obtaining driver key name.
        OOPS();
        FREE(hcInfo);
        return;
    }
 
    // Don't enumerate this host controller again if it already
    // on the list of enumerated host controllers.
    //
    listEntry = EnumeratedHCListHead.Flink;
 
    while (listEntry != &EnumeratedHCListHead)
    {
        hcInfoInList = CONTAINING_RECORD(listEntry,
                                         USBHOSTCONTROLLERINFO,
                                         ListEntry);
 
        if (strcmp(driverKeyName, hcInfoInList->DriverKey) == 0)
        {
            // Already on the list, exit
            //
            FREE(driverKeyName);
            FREE(hcInfo);
            return;
        }
 
        listEntry = listEntry->Flink;
    }
 
    // Obtain host controller device properties
    {
        size_t cbDriverName = 0;
        HRESULT hr = S_OK;
 
        hr = StringCbLength(driverKeyName, MAX_DRIVER_KEY_NAME, &cbDriverName);
        if (SUCCEEDED(hr))
        {
            DevProps = DriverNameToDeviceProperties(driverKeyName, cbDriverName);
        }
    }
 
    hcInfo->DriverKey = driverKeyName;
 
    if (DevProps)
    {
        ULONG   ven, dev, subsys, rev;
        ven = dev = subsys = rev = 0;
 
        if (sscanf_s(DevProps->DeviceId,
                   "PCI\\VEN_%x&DEV_%x&SUBSYS_%x&REV_%x",
                   &ven, &dev, &subsys, &rev) != 4)
        {
            OOPS();
        }
 
        hcInfo->VendorID = ven;
        hcInfo->DeviceID = dev;
        hcInfo->SubSysID = subsys;
        hcInfo->Revision = rev;
        hcInfo->UsbDeviceProperties = DevProps;
    }
    else
    {
        OOPS();
    }
 
    if (DevProps != NULL && DevProps->DeviceDesc != NULL)
    {
        leafName = DevProps->DeviceDesc;
    }
    else
    {
        OOPS();
    }
 
    // Get the USB Host Controller power map
    dwSuccess = GetHostControllerPowerMap(hHCDev, hcInfo);
 
    if (ERROR_SUCCESS != dwSuccess)
    {
        OOPS();
    }
 
 
    // Get bus, device, and function
    //
    hcInfo->BusDeviceFunctionValid = FALSE;
 
    success = SetupDiGetDeviceRegistryProperty(deviceInfo,
                                               deviceInfoData,
                                               SPDRP_BUSNUMBER,
                                               NULL,
                                               (PBYTE)&hcInfo->BusNumber,
                                               sizeof(hcInfo->BusNumber),
                                               NULL);
 
    if (success)
    {
        success = SetupDiGetDeviceRegistryProperty(deviceInfo,
                                                   deviceInfoData,
                                                   SPDRP_ADDRESS,
                                                   NULL,
                                                   (PBYTE)&deviceAndFunction,
                                                   sizeof(deviceAndFunction),
                                                   NULL);
    }
 
    if (success)
    {
        hcInfo->BusDevice = deviceAndFunction >> 16;
        hcInfo->BusFunction = deviceAndFunction & 0xffff;
        hcInfo->BusDeviceFunctionValid = TRUE;
    }
 
    // Get the USB Host Controller info
    dwSuccess = GetHostControllerInfo(hHCDev, hcInfo);
 
    if (ERROR_SUCCESS != dwSuccess)
    {
        OOPS();
    }
 
    // Add this host controller to the USB device tree view.
    //
    hHCItem = AddLeaf(hTreeParent,
                      (LPARAM)hcInfo,
                      leafName,
                      hcInfo->Revision == UsbSuperSpeed ? GoodSsDeviceIcon : GoodDeviceIcon);
 
    if (NULL == hHCItem)
    {
        // Failure adding host controller to USB device tree
        // view.
 
        OOPS();
        FREE(driverKeyName);
        FREE(hcInfo);
        return;
    }
 
    // Add this host controller to the list of enumerated
    // host controllers.
    //
    InsertTailList(&EnumeratedHCListHead,
                   &hcInfo->ListEntry);
 
    // Get the name of the root hub for this host
    // controller and then enumerate the root hub.
    //
    rootHubName = GetRootHubName(hHCDev);
 
    if (rootHubName != NULL)
    {
        size_t cbHubName = 0;
        HRESULT hr = S_OK;
 
        hr = StringCbLength(rootHubName, MAX_DRIVER_KEY_NAME, &cbHubName);
        if (SUCCEEDED(hr))
        {
            EnumerateHub(hHCItem,
                         rootHubName,
                         cbHubName,
                         NULL,       // ConnectionInfo
                         NULL,       // ConnectionInfoV2
                         NULL,       // PortConnectorProps
                         NULL,       // ConfigDesc
                         NULL,       // BosDesc
                         NULL,       // StringDescs
                         NULL);      // We do not pass DevProps for RootHub
        }
    }
    else
    {
        // Failure obtaining root hub name.
 
        OOPS();
    }
 
    return;
}
 
 
//*****************************************************************************
//
// EnumerateHub()
//
// hTreeParent - Handle of the TreeView item under which this hub should be
// added.
//
// HubName - Name of this hub.  This pointer is kept so the caller can neither
// free nor reuse this memory.
//
// ConnectionInfo - NULL if this is a root hub, else this is the connection
// info for an external hub.  This pointer is kept so the caller can neither
// free nor reuse this memory.
//
// ConfigDesc - NULL if this is a root hub, else this is the Configuration
// Descriptor for an external hub.  This pointer is kept so the caller can
// neither free nor reuse this memory.
//
// StringDescs - NULL if this is a root hub.
//
// DevProps - Device properties of the hub
//
//*****************************************************************************
 
VOID
EnumerateHub (
    HTREEITEM                                       hTreeParent,
    _In_reads_(cbHubName) PCHAR                     HubName,
    _In_ size_t                                     cbHubName,
    _In_opt_ PUSB_NODE_CONNECTION_INFORMATION_EX    ConnectionInfo,
    _In_opt_ PUSB_NODE_CONNECTION_INFORMATION_EX_V2 ConnectionInfoV2,
    _In_opt_ PUSB_PORT_CONNECTOR_PROPERTIES         PortConnectorProps,
    _In_opt_ PUSB_DESCRIPTOR_REQUEST                ConfigDesc,
    _In_opt_ PUSB_DESCRIPTOR_REQUEST                BosDesc,
    _In_opt_ PSTRING_DESCRIPTOR_NODE                StringDescs,
    _In_opt_ PUSB_DEVICE_PNP_STRINGS                DevProps
    )
{
    // Initialize locals to not allocated state so the error cleanup routine
    // only tries to cleanup things that were successfully allocated.
    //
    PUSB_NODE_INFORMATION    hubInfo = NULL;
    PUSB_HUB_INFORMATION_EX  hubInfoEx = NULL;
    PUSB_HUB_CAPABILITIES_EX hubCapabilityEx = NULL;
    HANDLE                  hHubDevice = INVALID_HANDLE_VALUE;
    HTREEITEM               hItem = NULL;
    PVOID                   info = NULL;
    PCHAR                   deviceName = NULL;
    ULONG                   nBytes = 0;
    BOOL                    success = 0;
    DWORD                   dwSizeOfLeafName = 0;
    CHAR                    leafName[512] = {0}; 
    HRESULT                 hr = S_OK;
    size_t                  cchHeader = 0;
    size_t                  cchFullHubName = 0;
 
    // Allocate some space for a USBDEVICEINFO structure to hold the
    // hub info, hub name, and connection info pointers.  GPTR zero
    // initializes the structure for us.
    //
    info = ALLOC(sizeof(USBEXTERNALHUBINFO));
    if (info == NULL)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    // Allocate some space for a USB_NODE_INFORMATION structure for this Hub
    //
    hubInfo = (PUSB_NODE_INFORMATION)ALLOC(sizeof(USB_NODE_INFORMATION));
    if (hubInfo == NULL)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    hubInfoEx = (PUSB_HUB_INFORMATION_EX)ALLOC(sizeof(USB_HUB_INFORMATION_EX));
    if (hubInfoEx == NULL)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    hubCapabilityEx = (PUSB_HUB_CAPABILITIES_EX)ALLOC(sizeof(USB_HUB_CAPABILITIES_EX));
    if(hubCapabilityEx == NULL)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    // Keep copies of the Hub Name, Connection Info, and Configuration
    // Descriptor pointers
    //
    ((PUSBROOTHUBINFO)info)->HubInfo   = hubInfo;
    ((PUSBROOTHUBINFO)info)->HubName   = HubName;
 
    if (ConnectionInfo != NULL)
    {
        ((PUSBEXTERNALHUBINFO)info)->DeviceInfoType = ExternalHubInfo;
        ((PUSBEXTERNALHUBINFO)info)->ConnectionInfo = ConnectionInfo;
        ((PUSBEXTERNALHUBINFO)info)->ConfigDesc = ConfigDesc;
        ((PUSBEXTERNALHUBINFO)info)->StringDescs = StringDescs;
        ((PUSBEXTERNALHUBINFO)info)->PortConnectorProps = PortConnectorProps;
        ((PUSBEXTERNALHUBINFO)info)->HubInfoEx = hubInfoEx;
        ((PUSBEXTERNALHUBINFO)info)->HubCapabilityEx = hubCapabilityEx;
        ((PUSBEXTERNALHUBINFO)info)->BosDesc = BosDesc;
        ((PUSBEXTERNALHUBINFO)info)->ConnectionInfoV2 = ConnectionInfoV2;
        ((PUSBEXTERNALHUBINFO)info)->UsbDeviceProperties = DevProps;
    }
    else
    {
        ((PUSBROOTHUBINFO)info)->DeviceInfoType = RootHubInfo;
        ((PUSBROOTHUBINFO)info)->HubInfoEx = hubInfoEx;
        ((PUSBROOTHUBINFO)info)->HubCapabilityEx = hubCapabilityEx;
        ((PUSBROOTHUBINFO)info)->PortConnectorProps = PortConnectorProps;
        ((PUSBROOTHUBINFO)info)->UsbDeviceProperties = DevProps;
    }
 
    // Allocate a temp buffer for the full hub device name.
    //
    hr = StringCbLength("\\\\.\\", MAX_DEVICE_PROP, &cchHeader);
    if (FAILED(hr))
    {
        goto EnumerateHubError;
    }
    cchFullHubName = cchHeader + cbHubName + 1;
    deviceName = (PCHAR)ALLOC((DWORD) cchFullHubName);
    if (deviceName == NULL)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    // Create the full hub device name
    //
    hr = StringCchCopyN(deviceName, cchFullHubName, "\\\\.\\", cchHeader);
    if (FAILED(hr))
    {
        goto EnumerateHubError;
    }
    hr = StringCchCatN(deviceName, cchFullHubName, HubName, cbHubName);
    if (FAILED(hr))
    {
        goto EnumerateHubError;
    }
 
    // Try to hub the open device
    //
    hHubDevice = CreateFile(deviceName,
                            GENERIC_WRITE,
                            FILE_SHARE_WRITE,
                            NULL,
                            OPEN_EXISTING,
                            0,
                            NULL);
 
    // Done with temp buffer for full hub device name
    //
    FREE(deviceName);
 
    if (hHubDevice == INVALID_HANDLE_VALUE)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    //
    // Now query USBHUB for the USB_NODE_INFORMATION structure for this hub.
    // This will tell us the number of downstream ports to enumerate, among
    // other things.
    //
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_NODE_INFORMATION,
                              hubInfo,
                              sizeof(USB_NODE_INFORMATION),
                              hubInfo,
                              sizeof(USB_NODE_INFORMATION),
                              &nBytes,
                              NULL);
 
    if (!success)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_HUB_INFORMATION_EX,
                              hubInfoEx,
                              sizeof(USB_HUB_INFORMATION_EX),
                              hubInfoEx,
                              sizeof(USB_HUB_INFORMATION_EX),
                              &nBytes,
                              NULL);
 
    //
    // Fail gracefully for downlevel OS's from Win8
    //
    if (!success || nBytes < sizeof(USB_HUB_INFORMATION_EX))
    {
        FREE(hubInfoEx);
        hubInfoEx = NULL;
        if (ConnectionInfo != NULL)
        {
            ((PUSBEXTERNALHUBINFO)info)->HubInfoEx = NULL;
        }
        else
        {
            ((PUSBROOTHUBINFO)info)->HubInfoEx = NULL;
        }
    }
 
    //
    // Obtain Hub Capabilities
    //
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_HUB_CAPABILITIES_EX,
                              hubCapabilityEx,
                              sizeof(USB_HUB_CAPABILITIES_EX),
                              hubCapabilityEx,
                              sizeof(USB_HUB_CAPABILITIES_EX),
                              &nBytes,
                              NULL);
 
    //
    // Fail gracefully
    //
    if (!success || nBytes < sizeof(USB_HUB_CAPABILITIES_EX))
    {
        FREE(hubCapabilityEx);
        hubCapabilityEx = NULL;
        if (ConnectionInfo != NULL)
        {
            ((PUSBEXTERNALHUBINFO)info)->HubCapabilityEx = NULL;
        }
        else
        {
            ((PUSBROOTHUBINFO)info)->HubCapabilityEx = NULL;
        }
    }
 
    // Build the leaf name from the port number and the device description
    //
    dwSizeOfLeafName = sizeof(leafName);
    if (ConnectionInfo)
    {
        StringCchPrintf(leafName, dwSizeOfLeafName, "[Port%d] ", ConnectionInfo->ConnectionIndex);
        StringCchCat(leafName, 
            dwSizeOfLeafName, 
            ConnectionStatuses[ConnectionInfo->ConnectionStatus]);
        StringCchCatN(leafName, 
            dwSizeOfLeafName, 
            " :  ",
            sizeof(" :  "));
    }
 
    if (DevProps)
    {
        size_t cbDeviceDesc = 0;
        hr = StringCbLength(DevProps->DeviceDesc, MAX_DRIVER_KEY_NAME, &cbDeviceDesc);
        if(SUCCEEDED(hr))
        {
            StringCchCatN(leafName, 
                    dwSizeOfLeafName, 
                    DevProps->DeviceDesc,
                    cbDeviceDesc);
        }
    }
    else
    {
        if(ConnectionInfo != NULL)
        {
            // External hub
            StringCchCatN(leafName, 
                    dwSizeOfLeafName, 
                    HubName,
                    cbHubName);
        }
        else
        {
            // Root hub
            StringCchCatN(leafName, 
                    dwSizeOfLeafName, 
                    "RootHub",
                    sizeof("RootHub")); 
        }
    }
 
    // Now add an item to the TreeView with the PUSBDEVICEINFO pointer info
    // as the LPARAM reference value containing everything we know about the
    // hub.
    //
    hItem = AddLeaf(hTreeParent,
                    (LPARAM)info,
                    leafName,
                    HubIcon);
 
    if (hItem == NULL)
    {
        OOPS();
        goto EnumerateHubError;
    }
 
    // Now recursively enumerate the ports of this hub.
    //
    EnumerateHubPorts(
        hItem,
        hHubDevice,
        hubInfo->u.HubInformation.HubDescriptor.bNumberOfPorts
        );
 
 
    CloseHandle(hHubDevice);
    return;
 
EnumerateHubError:
    //
    // Clean up any stuff that got allocated
    //
 
    if (hHubDevice != INVALID_HANDLE_VALUE)
    {
        CloseHandle(hHubDevice);
        hHubDevice = INVALID_HANDLE_VALUE;
    }
 
    if (hubInfo)
    {
        FREE(hubInfo);
    }
 
    if (hubInfoEx)
    {
        FREE(hubInfoEx);
    }
 
    if (info)
    {
        FREE(info);
    }
 
    if (HubName)
    {
        FREE(HubName);
    }
 
    if (ConnectionInfo)
    {
        FREE(ConnectionInfo);
    }
 
    if (ConfigDesc)
    {
        FREE(ConfigDesc);
    }
 
    if (BosDesc)
    {
        FREE(BosDesc);
    }
 
    if (StringDescs != NULL)
    {
        PSTRING_DESCRIPTOR_NODE Next;
 
        do {
 
            Next = StringDescs->Next;
            FREE(StringDescs);
            StringDescs = Next;
 
        } while (StringDescs != NULL);
    }
}
 
//*****************************************************************************
//
// EnumerateHubPorts()
//
// hTreeParent - Handle of the TreeView item under which the hub port should
// be added.
//
// hHubDevice - Handle of the hub device to enumerate.
//
// NumPorts - Number of ports on the hub.
//
//*****************************************************************************
 
VOID
EnumerateHubPorts (
    HTREEITEM   hTreeParent,
    HANDLE      hHubDevice,
    ULONG       NumPorts
)
{
    ULONG       index = 0;
    BOOL        success = 0;
    HRESULT     hr = S_OK;
    PCHAR       driverKeyName = NULL;
    PUSB_DEVICE_PNP_STRINGS DevProps;
    DWORD       dwSizeOfLeafName = 0;
    CHAR        leafName[512];
    int         icon = 0;
 
    PUSB_NODE_CONNECTION_INFORMATION_EX    connectionInfoEx;
    PUSB_PORT_CONNECTOR_PROPERTIES         pPortConnectorProps;
    USB_PORT_CONNECTOR_PROPERTIES          portConnectorProps;
    PUSB_DESCRIPTOR_REQUEST                configDesc;
    PUSB_DESCRIPTOR_REQUEST                bosDesc;
    PSTRING_DESCRIPTOR_NODE                stringDescs;
    PUSBDEVICEINFO                         info;
    PUSB_NODE_CONNECTION_INFORMATION_EX_V2 connectionInfoExV2;
    PDEVICE_INFO_NODE                      pNode;
 
    // Loop over all ports of the hub.
    //
    // Port indices are 1 based, not 0 based.
    //
    for (index = 1; index <= NumPorts; index++)
    {
        ULONG nBytesEx;
        ULONG nBytes = 0;
 
        connectionInfoEx = NULL;
        pPortConnectorProps = NULL;
        ZeroMemory(&portConnectorProps, sizeof(portConnectorProps));
        configDesc = NULL;
        bosDesc = NULL;
        stringDescs = NULL;
        info = NULL;
        connectionInfoExV2 = NULL;
        pNode = NULL;
        DevProps = NULL;
        ZeroMemory(leafName, sizeof(leafName));
 
        //
        // Allocate space to hold the connection info for this port.
        // For now, allocate it big enough to hold info for 30 pipes.
        //
        // Endpoint numbers are 0-15.  Endpoint number 0 is the standard
        // control endpoint which is not explicitly listed in the Configuration
        // Descriptor.  There can be an IN endpoint and an OUT endpoint at
        // endpoint numbers 1-15 so there can be a maximum of 30 endpoints
        // per device configuration.
        //
        // Should probably size this dynamically at some point.
        //
 
        nBytesEx = sizeof(USB_NODE_CONNECTION_INFORMATION_EX) +
                 (sizeof(USB_PIPE_INFO) * 30);
 
        connectionInfoEx = (PUSB_NODE_CONNECTION_INFORMATION_EX)ALLOC(nBytesEx);
 
        if (connectionInfoEx == NULL)
        {
            OOPS();
            break;
        }
 
        connectionInfoExV2 = (PUSB_NODE_CONNECTION_INFORMATION_EX_V2) 
                                    ALLOC(sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2));
 
        if (connectionInfoExV2 == NULL)
        {
            OOPS();
            FREE(connectionInfoEx);
            break;
        }
         
        //
        // Now query USBHUB for the structures
        // for this port.  This will tell us if a device is attached to this
        // port, among other things.
        // The fault tolerate code is executed first.
        //
 
        portConnectorProps.ConnectionIndex = index;
 
        success = DeviceIoControl(hHubDevice,
                                  IOCTL_USB_GET_PORT_CONNECTOR_PROPERTIES,
                                  &portConnectorProps,
                                  sizeof(USB_PORT_CONNECTOR_PROPERTIES),
                                  &portConnectorProps,
                                  sizeof(USB_PORT_CONNECTOR_PROPERTIES),
                                  &nBytes,
                                  NULL);
 
        if (success && nBytes == sizeof(USB_PORT_CONNECTOR_PROPERTIES)) 
        {
            pPortConnectorProps = (PUSB_PORT_CONNECTOR_PROPERTIES)
                                        ALLOC(portConnectorProps.ActualLength);
 
            if (pPortConnectorProps != NULL)
            {
                pPortConnectorProps->ConnectionIndex = index;
                 
                success = DeviceIoControl(hHubDevice,
                                          IOCTL_USB_GET_PORT_CONNECTOR_PROPERTIES,
                                          pPortConnectorProps,
                                          portConnectorProps.ActualLength,
                                          pPortConnectorProps,
                                          portConnectorProps.ActualLength,
                                          &nBytes,
                                          NULL);
 
                if (!success || nBytes < portConnectorProps.ActualLength)
                {
                    FREE(pPortConnectorProps);
                    pPortConnectorProps = NULL;
                }
            }
        }
         
        connectionInfoExV2->ConnectionIndex = index;
        connectionInfoExV2->Length = sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2);
        connectionInfoExV2->SupportedUsbProtocols.Usb300 = 1;
 
        success = DeviceIoControl(hHubDevice,
                                  IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2,
                                  connectionInfoExV2,
                                  sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2),
                                  connectionInfoExV2,
                                  sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2),
                                  &nBytes,
                                  NULL);
 
        if (!success || nBytes < sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2)) 
        {
            FREE(connectionInfoExV2);
            connectionInfoExV2 = NULL;
        }
 
        connectionInfoEx->ConnectionIndex = index;
 
        success = DeviceIoControl(hHubDevice,
                                  IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX,
                                  connectionInfoEx,
                                  nBytesEx,
                                  connectionInfoEx,
                                  nBytesEx,
                                  &nBytesEx,
                                  NULL);
 
        if (success)
        {
            //
            // Since the USB_NODE_CONNECTION_INFORMATION_EX is used to display
            // the device speed, but the hub driver doesn't support indication
            // of superspeed, we overwrite the value if the super speed
            // data structures are available and indicate the device is operating
            // at SuperSpeed.
            // 
             
            if (connectionInfoEx->Speed == UsbHighSpeed 
                && connectionInfoExV2 != NULL 
                && connectionInfoExV2->Flags.DeviceIsOperatingAtSuperSpeedOrHigher)
            {
                connectionInfoEx->Speed = UsbSuperSpeed;
            }
        } 
        else
        {
            PUSB_NODE_CONNECTION_INFORMATION    connectionInfo = NULL;
 
            // Try using IOCTL_USB_GET_NODE_CONNECTION_INFORMATION
            // instead of IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX
            //
 
            nBytes = sizeof(USB_NODE_CONNECTION_INFORMATION) +
                     sizeof(USB_PIPE_INFO) * 30;
 
            connectionInfo = (PUSB_NODE_CONNECTION_INFORMATION)ALLOC(nBytes);
 
            if (connectionInfo == NULL) 
            {
                OOPS();
 
                FREE(connectionInfoEx);
                if (pPortConnectorProps != NULL)
                {
                    FREE(pPortConnectorProps);
                }
                if (connectionInfoExV2 != NULL)
                {
                    FREE(connectionInfoExV2);
                }
                continue;                
            }
 
            connectionInfo->ConnectionIndex = index;
 
            success = DeviceIoControl(hHubDevice,
                                      IOCTL_USB_GET_NODE_CONNECTION_INFORMATION,
                                      connectionInfo,
                                      nBytes,
                                      connectionInfo,
                                      nBytes,
                                      &nBytes,
                                      NULL);
 
            if (!success)
            {
                OOPS();
 
                FREE(connectionInfo);
                FREE(connectionInfoEx);
                if (pPortConnectorProps != NULL)
                {
                    FREE(pPortConnectorProps);
                }
                if (connectionInfoExV2 != NULL)
                {
                    FREE(connectionInfoExV2);
                }
                continue;
            }
 
            // Copy IOCTL_USB_GET_NODE_CONNECTION_INFORMATION into
            // IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX structure.
            //
            connectionInfoEx->ConnectionIndex = connectionInfo->ConnectionIndex;
            connectionInfoEx->DeviceDescriptor = connectionInfo->DeviceDescriptor;
            connectionInfoEx->CurrentConfigurationValue = connectionInfo->CurrentConfigurationValue;
            connectionInfoEx->Speed = connectionInfo->LowSpeed ? UsbLowSpeed : UsbFullSpeed;
            connectionInfoEx->DeviceIsHub = connectionInfo->DeviceIsHub;
            connectionInfoEx->DeviceAddress = connectionInfo->DeviceAddress;
            connectionInfoEx->NumberOfOpenPipes = connectionInfo->NumberOfOpenPipes;
            connectionInfoEx->ConnectionStatus = connectionInfo->ConnectionStatus;
 
            memcpy(&connectionInfoEx->PipeList[0],
                   &connectionInfo->PipeList[0],
                   sizeof(USB_PIPE_INFO) * 30);
 
            FREE(connectionInfo);
        }
 
        // Update the count of connected devices
        //
        if (connectionInfoEx->ConnectionStatus == DeviceConnected)
        {
            TotalDevicesConnected++;
        }
 
        if (connectionInfoEx->DeviceIsHub)
        {
            TotalHubs++;
        }
 
        // If there is a device connected, get the Device Description
        //
        if (connectionInfoEx->ConnectionStatus != NoDeviceConnected)
        {
            driverKeyName = GetDriverKeyName(hHubDevice, index);
 
            if (driverKeyName)
            {
                size_t cbDriverName = 0;
 
                hr = StringCbLength(driverKeyName, MAX_DRIVER_KEY_NAME, &cbDriverName);
                if (SUCCEEDED(hr))
                {
                    DevProps = DriverNameToDeviceProperties(driverKeyName, cbDriverName);
                    pNode = FindMatchingDeviceNodeForDriverName(driverKeyName, connectionInfoEx->DeviceIsHub);
                }
                FREE(driverKeyName);
            }
 
        }
 
        // If there is a device connected to the port, try to retrieve the
        // Configuration Descriptor from the device.
        //
        if (gDoConfigDesc &&
            connectionInfoEx->ConnectionStatus == DeviceConnected)
        {
            configDesc = GetConfigDescriptor(hHubDevice,
                                             index,
                                             0);
        }
        else
        {
            configDesc = NULL;
        }
 
        if (configDesc != NULL &&
            connectionInfoEx->DeviceDescriptor.bcdUSB >= 0x0210)
        {
            bosDesc = GetBOSDescriptor(hHubDevice,
                                       index);
        }
        else
        {
            bosDesc = NULL;
        }
 
        if (configDesc != NULL &&
            AreThereStringDescriptors(&connectionInfoEx->DeviceDescriptor,
                                      (PUSB_CONFIGURATION_DESCRIPTOR)(configDesc+1)))
        {
            stringDescs = GetAllStringDescriptors (
                              hHubDevice,
                              index,
                              &connectionInfoEx->DeviceDescriptor,
                              (PUSB_CONFIGURATION_DESCRIPTOR)(configDesc+1));
        }
        else
        {
            stringDescs = NULL;
        }
 
        // If the device connected to the port is an external hub, get the
        // name of the external hub and recursively enumerate it.
        //
        if (connectionInfoEx->DeviceIsHub)
        {
            PCHAR extHubName;
            size_t cbHubName = 0;
 
            extHubName = GetExternalHubName(hHubDevice, index);
            if (extHubName != NULL)
            {
                hr = StringCbLength(extHubName, MAX_DRIVER_KEY_NAME, &cbHubName);
                if (SUCCEEDED(hr))
                {
                    EnumerateHub(hTreeParent, //hPortItem,
                            extHubName,
                            cbHubName,
                            connectionInfoEx,
                            connectionInfoExV2,
                            pPortConnectorProps,
                            configDesc,
                            bosDesc,
                            stringDescs,
                            DevProps);
                }
            }
        }
        else
        {
            // Allocate some space for a USBDEVICEINFO structure to hold the
            // hub info, hub name, and connection info pointers.  GPTR zero
            // initializes the structure for us.
            //
            info = (PUSBDEVICEINFO) ALLOC(sizeof(USBDEVICEINFO));
 
            if (info == NULL)
            {
                OOPS();
                if (configDesc != NULL)
                {
                    FREE(configDesc);
                }
                if (bosDesc != NULL)
                {
                    FREE(bosDesc);
                }
                FREE(connectionInfoEx);
                 
                if (pPortConnectorProps != NULL)
                {
                    FREE(pPortConnectorProps);
                }
                if (connectionInfoExV2 != NULL)
                {
                    FREE(connectionInfoExV2);
                }
                break;
            }
 
            info->DeviceInfoType = DeviceInfo;
            info->ConnectionInfo = connectionInfoEx;
            info->PortConnectorProps = pPortConnectorProps;
            info->ConfigDesc = configDesc;
            info->StringDescs = stringDescs;
            info->BosDesc = bosDesc;
            info->ConnectionInfoV2 = connectionInfoExV2;
            info->UsbDeviceProperties = DevProps;
            info->DeviceInfoNode = pNode;
 
            StringCchPrintf(leafName, sizeof(leafName), "[Port%d] ", index);
 
            // Add error description if ConnectionStatus is other than NoDeviceConnected / DeviceConnected
            StringCchCat(leafName, 
                sizeof(leafName), 
                ConnectionStatuses[connectionInfoEx->ConnectionStatus]);
 
            if (DevProps)
            {
                size_t cchDeviceDesc = 0;
 
                hr = StringCbLength(DevProps->DeviceDesc, MAX_DEVICE_PROP, &cchDeviceDesc);
                if (FAILED(hr))
                {
                    OOPS();
                }
                dwSizeOfLeafName = sizeof(leafName);
                StringCchCatN(leafName, 
                    dwSizeOfLeafName - 1, 
                    " :  ",
                    sizeof(" :  "));
                StringCchCatN(leafName, 
                    dwSizeOfLeafName - 1, 
                    DevProps->DeviceDesc,
                    cchDeviceDesc );
            }
 
            if (connectionInfoEx->ConnectionStatus == NoDeviceConnected)
            {
                if (connectionInfoExV2 != NULL &&
                    connectionInfoExV2->SupportedUsbProtocols.Usb300 == 1)
                {
                    icon = NoSsDeviceIcon;
                }
                else
                {
                    icon = NoDeviceIcon;
                }
            }
            else if (connectionInfoEx->CurrentConfigurationValue)
            {
                if (connectionInfoEx->Speed == UsbSuperSpeed)
                {
                    icon = GoodSsDeviceIcon;
                }
                else
                {
                    icon = GoodDeviceIcon;
                }
            }
            else
            {
                icon = BadDeviceIcon;
            }
 
            AddLeaf(hTreeParent, //hPortItem,
                            (LPARAM)info,
                            leafName,
                            icon);
        }
    } // for
}
 
 
//*****************************************************************************
//
// WideStrToMultiStr()
//
//*****************************************************************************
 
PCHAR WideStrToMultiStr ( 
                         _In_reads_bytes_(cbWideStr) PWCHAR WideStr, 
                         _In_ size_t                   cbWideStr
                         )
{
    ULONG  nBytes = 0;
    PCHAR  MultiStr = NULL;
    PWCHAR pWideStr = NULL;
 
    // Use local string to guarantee zero termination
    pWideStr = (PWCHAR) ALLOC((DWORD) cbWideStr + 1);
    if (NULL == pWideStr)
    {
        return NULL;
    }
    memset(pWideStr, 0, cbWideStr + 1);
    memcpy(pWideStr, WideStr, cbWideStr);
 
    // Get the length of the converted string
    //
    nBytes = WideCharToMultiByte(
                 CP_ACP,
                 WC_NO_BEST_FIT_CHARS,
                 pWideStr,
                 -1,
                 NULL,
                 0,
                 NULL,
                 NULL);
 
    if (nBytes == 0)
    {
        FREE(pWideStr);
        return NULL;
    }
 
    // Allocate space to hold the converted string
    //
    MultiStr = ALLOC(nBytes);
    if (MultiStr == NULL)
    {
        FREE(pWideStr);
        return NULL;
    }
 
    // Convert the string
    //
    nBytes = WideCharToMultiByte(
                 CP_ACP,
                 WC_NO_BEST_FIT_CHARS,
                 pWideStr,
                 -1,
                 MultiStr,
                 nBytes,
                 NULL,
                 NULL);
 
    if (nBytes == 0)
    {
        FREE(MultiStr);
        FREE(pWideStr);
        return NULL;
    }
 
    FREE(pWideStr);
    return MultiStr;
}
 
//*****************************************************************************
//
// GetRootHubName()
//
//*****************************************************************************
 
PCHAR GetRootHubName (
    HANDLE HostController
)
{
    BOOL                success = 0;
    ULONG               nBytes = 0;
    USB_ROOT_HUB_NAME   rootHubName;
    PUSB_ROOT_HUB_NAME  rootHubNameW = NULL;
    PCHAR               rootHubNameA = NULL;
 
    // Get the length of the name of the Root Hub attached to the
    // Host Controller
    //
    success = DeviceIoControl(HostController,
                              IOCTL_USB_GET_ROOT_HUB_NAME,
                              0,
                              0,
                              &rootHubName,
                              sizeof(rootHubName),
                              &nBytes,
                              NULL);
 
    if (!success)
    {
        OOPS();
        goto GetRootHubNameError;
    }
 
    // Allocate space to hold the Root Hub name
    //
    nBytes = rootHubName.ActualLength;
 
    rootHubNameW = ALLOC(nBytes);
    if (rootHubNameW == NULL)
    {
        OOPS();
        goto GetRootHubNameError;
    }
 
    // Get the name of the Root Hub attached to the Host Controller
    //
    success = DeviceIoControl(HostController,
                              IOCTL_USB_GET_ROOT_HUB_NAME,
                              NULL,
                              0,
                              rootHubNameW,
                              nBytes,
                              &nBytes,
                              NULL);
    if (!success)
    {
        OOPS();
        goto GetRootHubNameError;
    }
 
    // Convert the Root Hub name
    //
    rootHubNameA = WideStrToMultiStr(rootHubNameW->RootHubName, nBytes);
 
    // All done, free the uncoverted Root Hub name and return the
    // converted Root Hub name
    //
    FREE(rootHubNameW);
 
    return rootHubNameA;
 
GetRootHubNameError:
    // There was an error, free anything that was allocated
    //
    if (rootHubNameW != NULL)
    {
        FREE(rootHubNameW);
        rootHubNameW = NULL;
    }
    return NULL;
}
 
 
//*****************************************************************************
//
// GetExternalHubName()
//
//*****************************************************************************
 
PCHAR GetExternalHubName (
    HANDLE  Hub,
    ULONG   ConnectionIndex
)
{
    BOOL                        success = 0;
    ULONG                       nBytes = 0;
    USB_NODE_CONNECTION_NAME    extHubName;
    PUSB_NODE_CONNECTION_NAME   extHubNameW = NULL;
    PCHAR                       extHubNameA = NULL;
 
    // Get the length of the name of the external hub attached to the
    // specified port.
    //
    extHubName.ConnectionIndex = ConnectionIndex;
 
    success = DeviceIoControl(Hub,
                              IOCTL_USB_GET_NODE_CONNECTION_NAME,
                              &extHubName,
                              sizeof(extHubName),
                              &extHubName,
                              sizeof(extHubName),
                              &nBytes,
                              NULL);
 
    if (!success)
    {
        OOPS();
        goto GetExternalHubNameError;
    }
 
    // Allocate space to hold the external hub name
    //
    nBytes = extHubName.ActualLength;
 
    if (nBytes <= sizeof(extHubName))
    {
        OOPS();
        goto GetExternalHubNameError;
    }
 
    extHubNameW = ALLOC(nBytes);
 
    if (extHubNameW == NULL)
    {
        OOPS();
        goto GetExternalHubNameError;
    }
 
    // Get the name of the external hub attached to the specified port
    //
    extHubNameW->ConnectionIndex = ConnectionIndex;
 
    success = DeviceIoControl(Hub,
                              IOCTL_USB_GET_NODE_CONNECTION_NAME,
                              extHubNameW,
                              nBytes,
                              extHubNameW,
                              nBytes,
                              &nBytes,
                              NULL);
 
    if (!success)
    {
        OOPS();
        goto GetExternalHubNameError;
    }
 
    // Convert the External Hub name
    //
    extHubNameA = WideStrToMultiStr(extHubNameW->NodeName, nBytes);
 
    // All done, free the uncoverted external hub name and return the
    // converted external hub name
    //
    FREE(extHubNameW);
 
    return extHubNameA;
 
 
GetExternalHubNameError:
    // There was an error, free anything that was allocated
    //
    if (extHubNameW != NULL)
    {
        FREE(extHubNameW);
        extHubNameW = NULL;
    }
 
    return NULL;
}
 
 
//*****************************************************************************
//
// GetDriverKeyName()
//
//*****************************************************************************
 
PCHAR GetDriverKeyName (
    HANDLE  Hub,
    ULONG   ConnectionIndex
)
{
    BOOL                                success = 0;
    ULONG                               nBytes = 0;
    USB_NODE_CONNECTION_DRIVERKEY_NAME  driverKeyName;
    PUSB_NODE_CONNECTION_DRIVERKEY_NAME driverKeyNameW = NULL;
    PCHAR                               driverKeyNameA = NULL;
 
    // Get the length of the name of the driver key of the device attached to
    // the specified port.
    //
    driverKeyName.ConnectionIndex = ConnectionIndex;
 
    success = DeviceIoControl(Hub,
                              IOCTL_USB_GET_NODE_CONNECTION_DRIVERKEY_NAME,
                              &driverKeyName,
                              sizeof(driverKeyName),
                              &driverKeyName,
                              sizeof(driverKeyName),
                              &nBytes,
                              NULL);
 
    if (!success)
    {
        OOPS();
        goto GetDriverKeyNameError;
    }
 
    // Allocate space to hold the driver key name
    //
    nBytes = driverKeyName.ActualLength;
 
    if (nBytes <= sizeof(driverKeyName))
    {
        OOPS();
        goto GetDriverKeyNameError;
    }
 
    driverKeyNameW = ALLOC(nBytes);
    if (driverKeyNameW == NULL)
    {
        OOPS();
        goto GetDriverKeyNameError;
    }
 
    // Get the name of the driver key of the device attached to
    // the specified port.
    //
    driverKeyNameW->ConnectionIndex = ConnectionIndex;
 
    success = DeviceIoControl(Hub,
                              IOCTL_USB_GET_NODE_CONNECTION_DRIVERKEY_NAME,
                              driverKeyNameW,
                              nBytes,
                              driverKeyNameW,
                              nBytes,
                              &nBytes,
                              NULL);
 
    if (!success)
    {
        OOPS();
        goto GetDriverKeyNameError;
    }
 
    // Convert the driver key name
    //
    driverKeyNameA = WideStrToMultiStr(driverKeyNameW->DriverKeyName, nBytes);
 
    // All done, free the uncoverted driver key name and return the
    // converted driver key name
    //
    FREE(driverKeyNameW);
 
    return driverKeyNameA;
 
 
GetDriverKeyNameError:
    // There was an error, free anything that was allocated
    //
    if (driverKeyNameW != NULL)
    {
        FREE(driverKeyNameW);
        driverKeyNameW = NULL;
    }
 
    return NULL;
}
 
 
//*****************************************************************************
//
// GetHCDDriverKeyName()
//
//*****************************************************************************
 
PCHAR GetHCDDriverKeyName (
    HANDLE  HCD
)
{
    BOOL                    success = 0;
    ULONG                   nBytes = 0;
    USB_HCD_DRIVERKEY_NAME  driverKeyName = {0};
    PUSB_HCD_DRIVERKEY_NAME driverKeyNameW = NULL;
    PCHAR                   driverKeyNameA = NULL;
 
    ZeroMemory(&driverKeyName, sizeof(driverKeyName));
 
    // Get the length of the name of the driver key of the HCD
    //
    success = DeviceIoControl(HCD,
                              IOCTL_GET_HCD_DRIVERKEY_NAME,
                              &driverKeyName,
                              sizeof(driverKeyName),
                              &driverKeyName,
                              sizeof(driverKeyName),
                              &nBytes,
                              NULL);
 
    if (!success)
    {
        OOPS();
        goto GetHCDDriverKeyNameError;
    }
 
    // Allocate space to hold the driver key name
    //
    nBytes = driverKeyName.ActualLength;
    if (nBytes <= sizeof(driverKeyName))
    {
        OOPS();
        goto GetHCDDriverKeyNameError;
    }
 
    // Allocate size of name plus 1 for terminal zero
    driverKeyNameW = ALLOC(nBytes + 1);
    if (driverKeyNameW == NULL)
    {
        OOPS();
        goto GetHCDDriverKeyNameError;
    }
 
    // Get the name of the driver key of the device attached to
    // the specified port.
    //
 
    success = DeviceIoControl(HCD,
                              IOCTL_GET_HCD_DRIVERKEY_NAME,
                              driverKeyNameW,
                              nBytes,
                              driverKeyNameW,
                              nBytes,
                              &nBytes,
                              NULL);
    if (!success)
    {
        OOPS();
        goto GetHCDDriverKeyNameError;
    }
 
    // Convert the driver key name
    //
    driverKeyNameA = WideStrToMultiStr(driverKeyNameW->DriverKeyName, nBytes);
 
    // All done, free the uncoverted driver key name and return the
    // converted driver key name
    //
    FREE(driverKeyNameW);
 
    return driverKeyNameA;
 
GetHCDDriverKeyNameError:
    // There was an error, free anything that was allocated
    //
    if (driverKeyNameW != NULL)
    {
        FREE(driverKeyNameW);
        driverKeyNameW = NULL;
    }
 
    return NULL;
}
 
 
//*****************************************************************************
//
// GetConfigDescriptor()
//
// hHubDevice - Handle of the hub device containing the port from which the
// Configuration Descriptor will be requested.
//
// ConnectionIndex - Identifies the port on the hub to which a device is
// attached from which the Configuration Descriptor will be requested.
//
// DescriptorIndex - Configuration Descriptor index, zero based.
//
//*****************************************************************************
 
PUSB_DESCRIPTOR_REQUEST
GetConfigDescriptor (
    HANDLE  hHubDevice,
    ULONG   ConnectionIndex,
    UCHAR   DescriptorIndex
)
{
    BOOL    success = 0;
    ULONG   nBytes = 0;
    ULONG   nBytesReturned = 0;
 
    UCHAR   configDescReqBuf[sizeof(USB_DESCRIPTOR_REQUEST) +
                             sizeof(USB_CONFIGURATION_DESCRIPTOR)];
 
    PUSB_DESCRIPTOR_REQUEST         configDescReq = NULL;
    PUSB_CONFIGURATION_DESCRIPTOR   configDesc = NULL;
 
 
    // Request the Configuration Descriptor the first time using our
    // local buffer, which is just big enough for the Cofiguration
    // Descriptor itself.
    //
    nBytes = sizeof(configDescReqBuf);
 
    configDescReq = (PUSB_DESCRIPTOR_REQUEST)configDescReqBuf;
    configDesc = (PUSB_CONFIGURATION_DESCRIPTOR)(configDescReq+1);
 
    // Zero fill the entire request structure
    //
    memset(configDescReq, 0, nBytes);
 
    // Indicate the port from which the descriptor will be requested
    //
    configDescReq->ConnectionIndex = ConnectionIndex;
 
    //
    // USBHUB uses URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE to process this
    // IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION request.
    //
    // USBD will automatically initialize these fields:
    //     bmRequest = 0x80
    //     bRequest  = 0x06
    //
    // We must inititialize these fields:
    //     wValue    = Descriptor Type (high) and Descriptor Index (low byte)
    //     wIndex    = Zero (or Language ID for String Descriptors)
    //     wLength   = Length of descriptor buffer
    //
    configDescReq->SetupPacket.wValue = (USB_CONFIGURATION_DESCRIPTOR_TYPE << 8)
                                        | DescriptorIndex;
 
    configDescReq->SetupPacket.wLength = (USHORT)(nBytes - sizeof(USB_DESCRIPTOR_REQUEST));
 
    // Now issue the get descriptor request.
    //
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
                              configDescReq,
                              nBytes,
                              configDescReq,
                              nBytes,
                              &nBytesReturned,
                              NULL);
 
    if (!success)
    {
        OOPS();
        return NULL;
    }
 
    if (nBytes != nBytesReturned)
    {
        OOPS();
        return NULL;
    }
 
    if (configDesc->wTotalLength < sizeof(USB_CONFIGURATION_DESCRIPTOR))
    {
        OOPS();
        return NULL;
    }
 
    // Now request the entire Configuration Descriptor using a dynamically
    // allocated buffer which is sized big enough to hold the entire descriptor
    //
    nBytes = sizeof(USB_DESCRIPTOR_REQUEST) + configDesc->wTotalLength;
 
    configDescReq = (PUSB_DESCRIPTOR_REQUEST)ALLOC(nBytes);
 
    if (configDescReq == NULL)
    {
        OOPS();
        return NULL;
    }
 
    configDesc = (PUSB_CONFIGURATION_DESCRIPTOR)(configDescReq+1);
 
    // Indicate the port from which the descriptor will be requested
    //
    configDescReq->ConnectionIndex = ConnectionIndex;
 
    //
    // USBHUB uses URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE to process this
    // IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION request.
    //
    // USBD will automatically initialize these fields:
    //     bmRequest = 0x80
    //     bRequest  = 0x06
    //
    // We must inititialize these fields:
    //     wValue    = Descriptor Type (high) and Descriptor Index (low byte)
    //     wIndex    = Zero (or Language ID for String Descriptors)
    //     wLength   = Length of descriptor buffer
    //
    configDescReq->SetupPacket.wValue = (USB_CONFIGURATION_DESCRIPTOR_TYPE << 8)
                                        | DescriptorIndex;
 
    configDescReq->SetupPacket.wLength = (USHORT)(nBytes - sizeof(USB_DESCRIPTOR_REQUEST));
 
    // Now issue the get descriptor request.
    //
 
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
                              configDescReq,
                              nBytes,
                              configDescReq,
                              nBytes,
                              &nBytesReturned,
                              NULL);
 
    if (!success)
    {
        OOPS();
        FREE(configDescReq);
        return NULL;
    }
 
    if (nBytes != nBytesReturned)
    {
        OOPS();
        FREE(configDescReq);
        return NULL;
    }
 
    if (configDesc->wTotalLength != (nBytes - sizeof(USB_DESCRIPTOR_REQUEST)))
    {
        OOPS();
        FREE(configDescReq);
        return NULL;
    }
 
    return configDescReq;
}
 
 
 
//*****************************************************************************
//
// GetBOSDescriptor()
//
// hHubDevice - Handle of the hub device containing the port from which the
// Configuration Descriptor will be requested.
//
// ConnectionIndex - Identifies the port on the hub to which a device is
// attached from which the BOS Descriptor will be requested.
//
//*****************************************************************************
 
PUSB_DESCRIPTOR_REQUEST
GetBOSDescriptor (
    HANDLE  hHubDevice,
    ULONG   ConnectionIndex
)
{
    BOOL    success = 0;
    ULONG   nBytes = 0;
    ULONG   nBytesReturned = 0;
 
    UCHAR   bosDescReqBuf[sizeof(USB_DESCRIPTOR_REQUEST) +
                          sizeof(USB_BOS_DESCRIPTOR)];
 
    PUSB_DESCRIPTOR_REQUEST bosDescReq = NULL;
    PUSB_BOS_DESCRIPTOR     bosDesc = NULL;
 
 
    // Request the BOS Descriptor the first time using our
    // local buffer, which is just big enough for the BOS
    // Descriptor itself.
    //
    nBytes = sizeof(bosDescReqBuf);
 
    bosDescReq = (PUSB_DESCRIPTOR_REQUEST)bosDescReqBuf;
    bosDesc = (PUSB_BOS_DESCRIPTOR)(bosDescReq+1);
 
    // Zero fill the entire request structure
    //
    memset(bosDescReq, 0, nBytes);
 
    // Indicate the port from which the descriptor will be requested
    //
    bosDescReq->ConnectionIndex = ConnectionIndex;
 
    //
    // USBHUB uses URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE to process this
    // IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION request.
    //
    // USBD will automatically initialize these fields:
    //     bmRequest = 0x80
    //     bRequest  = 0x06
    //
    // We must inititialize these fields:
    //     wValue    = Descriptor Type (high) and Descriptor Index (low byte)
    //     wIndex    = Zero (or Language ID for String Descriptors)
    //     wLength   = Length of descriptor buffer
    //
    bosDescReq->SetupPacket.wValue = (USB_BOS_DESCRIPTOR_TYPE << 8);
 
    bosDescReq->SetupPacket.wLength = (USHORT)(nBytes - sizeof(USB_DESCRIPTOR_REQUEST));
 
    // Now issue the get descriptor request.
    //
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
                              bosDescReq,
                              nBytes,
                              bosDescReq,
                              nBytes,
                              &nBytesReturned,
                              NULL);
 
    if (!success)
    {
        OOPS();
        return NULL;
    }
 
    if (nBytes != nBytesReturned)
    {
        OOPS();
        return NULL;
    }
 
    if (bosDesc->wTotalLength < sizeof(USB_BOS_DESCRIPTOR))
    {
        OOPS();
        return NULL;
    }
 
    // Now request the entire BOS Descriptor using a dynamically
    // allocated buffer which is sized big enough to hold the entire descriptor
    //
    nBytes = sizeof(USB_DESCRIPTOR_REQUEST) + bosDesc->wTotalLength;
 
    bosDescReq = (PUSB_DESCRIPTOR_REQUEST)ALLOC(nBytes);
 
    if (bosDescReq == NULL)
    {
        OOPS();
        return NULL;
    }
 
    bosDesc = (PUSB_BOS_DESCRIPTOR)(bosDescReq+1);
 
    // Indicate the port from which the descriptor will be requested
    //
    bosDescReq->ConnectionIndex = ConnectionIndex;
 
    //
    // USBHUB uses URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE to process this
    // IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION request.
    //
    // USBD will automatically initialize these fields:
    //     bmRequest = 0x80
    //     bRequest  = 0x06
    //
    // We must inititialize these fields:
    //     wValue    = Descriptor Type (high) and Descriptor Index (low byte)
    //     wIndex    = Zero (or Language ID for String Descriptors)
    //     wLength   = Length of descriptor buffer
    //
    bosDescReq->SetupPacket.wValue = (USB_BOS_DESCRIPTOR_TYPE << 8);
 
    bosDescReq->SetupPacket.wLength = (USHORT)(nBytes - sizeof(USB_DESCRIPTOR_REQUEST));
 
    // Now issue the get descriptor request.
    //
 
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
                              bosDescReq,
                              nBytes,
                              bosDescReq,
                              nBytes,
                              &nBytesReturned,
                              NULL);
 
    if (!success)
    {
        OOPS();
        FREE(bosDescReq);
        return NULL;
    }
 
    if (nBytes != nBytesReturned)
    {
        OOPS();
        FREE(bosDescReq);
        return NULL;
    }
 
    if (bosDesc->wTotalLength != (nBytes - sizeof(USB_DESCRIPTOR_REQUEST)))
    {
        OOPS();
        FREE(bosDescReq);
        return NULL;
    }
 
    return bosDescReq;
}
 
 
//*****************************************************************************
//
// AreThereStringDescriptors()
//
// DeviceDesc - Device Descriptor for which String Descriptors should be
// checked.
//
// ConfigDesc - Configuration Descriptor (also containing Interface Descriptor)
// for which String Descriptors should be checked.
//
//*****************************************************************************
 
BOOL
AreThereStringDescriptors (
    PUSB_DEVICE_DESCRIPTOR          DeviceDesc,
    PUSB_CONFIGURATION_DESCRIPTOR   ConfigDesc
)
{
    PUCHAR                  descEnd = NULL;
    PUSB_COMMON_DESCRIPTOR  commonDesc = NULL;
 
    //
    // Check Device Descriptor strings
    //
 
    if (DeviceDesc->iManufacturer ||
        DeviceDesc->iProduct      ||
        DeviceDesc->iSerialNumber
       )
    {
        return TRUE;
    }
 
 
    //
    // Check the Configuration and Interface Descriptor strings
    //
 
    descEnd = (PUCHAR)ConfigDesc + ConfigDesc->wTotalLength;
 
    commonDesc = (PUSB_COMMON_DESCRIPTOR)ConfigDesc;
 
    while ((PUCHAR)commonDesc + sizeof(USB_COMMON_DESCRIPTOR) < descEnd &&
           (PUCHAR)commonDesc + commonDesc->bLength <= descEnd)
    {
        switch (commonDesc->bDescriptorType)
        {
            case USB_CONFIGURATION_DESCRIPTOR_TYPE:
            case USB_OTHER_SPEED_CONFIGURATION_DESCRIPTOR_TYPE:
                if (commonDesc->bLength != sizeof(USB_CONFIGURATION_DESCRIPTOR))
                {
                    OOPS();
                    break;
                }
                if (((PUSB_CONFIGURATION_DESCRIPTOR)commonDesc)->iConfiguration)
                {
                    return TRUE;
                }
                commonDesc = (PUSB_COMMON_DESCRIPTOR) ((PUCHAR) commonDesc + commonDesc->bLength);
                continue;
 
            case USB_INTERFACE_DESCRIPTOR_TYPE:
                if (commonDesc->bLength != sizeof(USB_INTERFACE_DESCRIPTOR) &&
                    commonDesc->bLength != sizeof(USB_INTERFACE_DESCRIPTOR2))
                {
                    OOPS();
                    break;
                }
                if (((PUSB_INTERFACE_DESCRIPTOR)commonDesc)->iInterface)
                {
                    return TRUE;
                }
                commonDesc = (PUSB_COMMON_DESCRIPTOR) ((PUCHAR) commonDesc + commonDesc->bLength);
                continue;
 
            default:
                commonDesc = (PUSB_COMMON_DESCRIPTOR) ((PUCHAR) commonDesc + commonDesc->bLength);
                continue;
        }
        break;
    }
 
    return FALSE;
}
 
 
//*****************************************************************************
//
// GetAllStringDescriptors()
//
// hHubDevice - Handle of the hub device containing the port from which the
// String Descriptors will be requested.
//
// ConnectionIndex - Identifies the port on the hub to which a device is
// attached from which the String Descriptors will be requested.
//
// DeviceDesc - Device Descriptor for which String Descriptors should be
// requested.
//
// ConfigDesc - Configuration Descriptor (also containing Interface Descriptor)
// for which String Descriptors should be requested.
//
//*****************************************************************************
 
PSTRING_DESCRIPTOR_NODE
GetAllStringDescriptors (
    HANDLE                          hHubDevice,
    ULONG                           ConnectionIndex,
    PUSB_DEVICE_DESCRIPTOR          DeviceDesc,
    PUSB_CONFIGURATION_DESCRIPTOR   ConfigDesc
)
{
    PSTRING_DESCRIPTOR_NODE supportedLanguagesString = NULL;
    ULONG                   numLanguageIDs = 0;
    USHORT                  *languageIDs = NULL;
 
    PUCHAR                  descEnd = NULL;
    PUSB_COMMON_DESCRIPTOR  commonDesc = NULL;
    UCHAR                   uIndex = 1;
    UCHAR                   bInterfaceClass = 0;
    BOOL                    getMoreStrings = FALSE;
    HRESULT                 hr = S_OK;
 
    //
    // Get the array of supported Language IDs, which is returned
    // in String Descriptor 0
    //
    supportedLanguagesString = GetStringDescriptor(hHubDevice,
                                                   ConnectionIndex,
                                                   0,
                                                   0);
 
    if (supportedLanguagesString == NULL)
    {
        return NULL;
    }
 
    numLanguageIDs = (supportedLanguagesString->StringDescriptor->bLength - 2) / 2;
 
    languageIDs = &supportedLanguagesString->StringDescriptor->bString[0];
 
    //
    // Get the Device Descriptor strings
    //
 
    if (DeviceDesc->iManufacturer)
    {
        GetStringDescriptors(hHubDevice,
                             ConnectionIndex,
                             DeviceDesc->iManufacturer,
                             numLanguageIDs,
                             languageIDs,
                             supportedLanguagesString);
    }
 
    if (DeviceDesc->iProduct)
    {
        GetStringDescriptors(hHubDevice,
                             ConnectionIndex,
                             DeviceDesc->iProduct,
                             numLanguageIDs,
                             languageIDs,
                             supportedLanguagesString);
    }
 
    if (DeviceDesc->iSerialNumber)
    {
        GetStringDescriptors(hHubDevice,
                             ConnectionIndex,
                             DeviceDesc->iSerialNumber,
                             numLanguageIDs,
                             languageIDs,
                             supportedLanguagesString);
    }
 
    //
    // Get the Configuration and Interface Descriptor strings
    //
 
    descEnd = (PUCHAR)ConfigDesc + ConfigDesc->wTotalLength;
 
    commonDesc = (PUSB_COMMON_DESCRIPTOR)ConfigDesc;
 
    while ((PUCHAR)commonDesc + sizeof(USB_COMMON_DESCRIPTOR) < descEnd &&
           (PUCHAR)commonDesc + commonDesc->bLength <= descEnd)
    {
        switch (commonDesc->bDescriptorType)
        {
            case USB_CONFIGURATION_DESCRIPTOR_TYPE:
                if (commonDesc->bLength != sizeof(USB_CONFIGURATION_DESCRIPTOR))
                {
                    OOPS();
                    break;
                }
                if (((PUSB_CONFIGURATION_DESCRIPTOR)commonDesc)->iConfiguration)
                {
                    GetStringDescriptors(hHubDevice,
                                         ConnectionIndex,
                                         ((PUSB_CONFIGURATION_DESCRIPTOR)commonDesc)->iConfiguration,
                                         numLanguageIDs,
                                         languageIDs,
                                         supportedLanguagesString);
                }
                commonDesc = (PUSB_COMMON_DESCRIPTOR) ((PUCHAR) commonDesc + commonDesc->bLength);
                continue;
 
            case USB_IAD_DESCRIPTOR_TYPE:
                if (commonDesc->bLength < sizeof(USB_IAD_DESCRIPTOR))
                {
                    OOPS();
                    break;
                }
                if (((PUSB_IAD_DESCRIPTOR)commonDesc)->iFunction)
                {
                    GetStringDescriptors(hHubDevice,
                                         ConnectionIndex,
                                         ((PUSB_IAD_DESCRIPTOR)commonDesc)->iFunction,
                                         numLanguageIDs,
                                         languageIDs,
                                         supportedLanguagesString);
                }
                commonDesc = (PUSB_COMMON_DESCRIPTOR) ((PUCHAR) commonDesc + commonDesc->bLength);
                continue;
 
            case USB_INTERFACE_DESCRIPTOR_TYPE:
                if (commonDesc->bLength != sizeof(USB_INTERFACE_DESCRIPTOR) &&
                    commonDesc->bLength != sizeof(USB_INTERFACE_DESCRIPTOR2))
                {
                    OOPS();
                    break;
                }
                if (((PUSB_INTERFACE_DESCRIPTOR)commonDesc)->iInterface)
                {
                    GetStringDescriptors(hHubDevice,
                                         ConnectionIndex,
                                         ((PUSB_INTERFACE_DESCRIPTOR)commonDesc)->iInterface,
                                         numLanguageIDs,
                                         languageIDs,
                                         supportedLanguagesString);
                }
 
                //
                // We need to display more string descriptors for the following
                // interface classes
                //
                bInterfaceClass = ((PUSB_INTERFACE_DESCRIPTOR)commonDesc)->bInterfaceClass;
                if (bInterfaceClass == USB_DEVICE_CLASS_VIDEO)
                {
                    getMoreStrings = TRUE;
                }
                commonDesc = (PUSB_COMMON_DESCRIPTOR) ((PUCHAR) commonDesc + commonDesc->bLength);
                continue;
 
            default:
                commonDesc = (PUSB_COMMON_DESCRIPTOR) ((PUCHAR) commonDesc + commonDesc->bLength);
                continue;
        }
        break;
    }
 
    if (getMoreStrings)
    {
        //
        // We might need to display strings later that are referenced only in
        // class-specific descriptors. Get String Descriptors 1 through 32 (an
        // arbitrary upper limit for Strings needed due to "bad devices"
        // returning an infinite repeat of Strings 0 through 4) until one is not
        // found.
        //
        // There are also "bad devices" that have issues even querying 1-32, but
        // historically USBView made this query, so the query should be safe for
        // video devices.
        //
        for (uIndex = 1; SUCCEEDED(hr) && (uIndex < NUM_STRING_DESC_TO_GET); uIndex++) 
        {
            hr = GetStringDescriptors(hHubDevice,
                                      ConnectionIndex,
                                      uIndex,
                                      numLanguageIDs,
                                      languageIDs,
                                      supportedLanguagesString);
        }
    }
 
    return supportedLanguagesString;
}
             
 
 
//*****************************************************************************
//
// GetStringDescriptor()
//
// hHubDevice - Handle of the hub device containing the port from which the
// String Descriptor will be requested.
//
// ConnectionIndex - Identifies the port on the hub to which a device is
// attached from which the String Descriptor will be requested.
//
// DescriptorIndex - String Descriptor index.
//
// LanguageID - Language in which the string should be requested.
//
//*****************************************************************************
 
PSTRING_DESCRIPTOR_NODE
GetStringDescriptor (
    HANDLE  hHubDevice,
    ULONG   ConnectionIndex,
    UCHAR   DescriptorIndex,
    USHORT  LanguageID
)
{
    BOOL    success = 0;
    ULONG   nBytes = 0;
    ULONG   nBytesReturned = 0;
 
    UCHAR   stringDescReqBuf[sizeof(USB_DESCRIPTOR_REQUEST) +
                             MAXIMUM_USB_STRING_LENGTH];
 
    PUSB_DESCRIPTOR_REQUEST stringDescReq = NULL;
    PUSB_STRING_DESCRIPTOR  stringDesc = NULL;
    PSTRING_DESCRIPTOR_NODE stringDescNode = NULL;
 
    nBytes = sizeof(stringDescReqBuf);
 
    stringDescReq = (PUSB_DESCRIPTOR_REQUEST)stringDescReqBuf;
    stringDesc = (PUSB_STRING_DESCRIPTOR)(stringDescReq+1);
 
    // Zero fill the entire request structure
    //
    memset(stringDescReq, 0, nBytes);
 
    // Indicate the port from which the descriptor will be requested
    //
    stringDescReq->ConnectionIndex = ConnectionIndex;
 
    //
    // USBHUB uses URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE to process this
    // IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION request.
    //
    // USBD will automatically initialize these fields:
    //     bmRequest = 0x80
    //     bRequest  = 0x06
    //
    // We must inititialize these fields:
    //     wValue    = Descriptor Type (high) and Descriptor Index (low byte)
    //     wIndex    = Zero (or Language ID for String Descriptors)
    //     wLength   = Length of descriptor buffer
    //
    stringDescReq->SetupPacket.wValue = (USB_STRING_DESCRIPTOR_TYPE << 8)
                                        | DescriptorIndex;
 
    stringDescReq->SetupPacket.wIndex = LanguageID;
 
    stringDescReq->SetupPacket.wLength = (USHORT)(nBytes - sizeof(USB_DESCRIPTOR_REQUEST));
 
    // Now issue the get descriptor request.
    //
    success = DeviceIoControl(hHubDevice,
                              IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
                              stringDescReq,
                              nBytes,
                              stringDescReq,
                              nBytes,
                              &nBytesReturned,
                              NULL);
 
    //
    // Do some sanity checks on the return from the get descriptor request.
    //
 
    if (!success)
    {
        OOPS();
        return NULL;
    }
 
    if (nBytesReturned < 2)
    {
        OOPS();
        return NULL;
    }
 
    if (stringDesc->bDescriptorType != USB_STRING_DESCRIPTOR_TYPE)
    {
        OOPS();
        return NULL;
    }
 
    if (stringDesc->bLength != nBytesReturned - sizeof(USB_DESCRIPTOR_REQUEST))
    {
        OOPS();
        return NULL;
    }
 
    if (stringDesc->bLength % 2 != 0)
    {
        OOPS();
        return NULL;
    }
 
    //
    // Looks good, allocate some (zero filled) space for the string descriptor
    // node and copy the string descriptor to it.
    //
 
    stringDescNode = (PSTRING_DESCRIPTOR_NODE)ALLOC(sizeof(STRING_DESCRIPTOR_NODE) +
                                                    stringDesc->bLength);
 
    if (stringDescNode == NULL)
    {
        OOPS();
        return NULL;
    }
 
    stringDescNode->DescriptorIndex = DescriptorIndex;
    stringDescNode->LanguageID = LanguageID;
 
    memcpy(stringDescNode->StringDescriptor,
           stringDesc,
           stringDesc->bLength);
 
    return stringDescNode;
}
 
 
//*****************************************************************************
//
// GetStringDescriptors()
//
// hHubDevice - Handle of the hub device containing the port from which the
// String Descriptor will be requested.
//
// ConnectionIndex - Identifies the port on the hub to which a device is
// attached from which the String Descriptor will be requested.
//
// DescriptorIndex - String Descriptor index.
//
// NumLanguageIDs -  Number of languages in which the string should be
// requested.
//
// LanguageIDs - Languages in which the string should be requested.
//
// StringDescNodeHead - First node in linked list of device's string descriptors
//
// Return Value: HRESULT indicating whether the string is on the list
//
//*****************************************************************************
 
HRESULT
GetStringDescriptors (
    _In_ HANDLE                         hHubDevice,
    _In_ ULONG                          ConnectionIndex,
    _In_ UCHAR                          DescriptorIndex,
    _In_ ULONG                          NumLanguageIDs,
    _In_reads_(NumLanguageIDs) USHORT  *LanguageIDs,
    _In_ PSTRING_DESCRIPTOR_NODE        StringDescNodeHead
)
{
    PSTRING_DESCRIPTOR_NODE tail = NULL;
    PSTRING_DESCRIPTOR_NODE trailing = NULL;
    ULONG i = 0;
 
    //
    // Go to the end of the linked list, searching for the requested index to
    // see if we've already retrieved it
    //
    for (tail = StringDescNodeHead; tail != NULL; tail = tail->Next)
    {
        if (tail->DescriptorIndex == DescriptorIndex)
        {
            return S_OK;
        }
 
        trailing = tail;
    }
 
    tail = trailing;
 
    //
    // Get the next String Descriptor. If this is NULL, then we're done (return)
    // Otherwise, loop through all Language IDs
    //
    for (i = 0; (tail != NULL) && (i < NumLanguageIDs); i++)
    {
        tail->Next = GetStringDescriptor(hHubDevice,
                                         ConnectionIndex,
                                         DescriptorIndex,
                                         LanguageIDs[i]);
 
        tail = tail->Next;
    }
 
    if (tail == NULL)
    {
        return E_FAIL;
    } else {
        return S_OK;
    }
}
 
 
//*****************************************************************************
//
// CleanupItem()
//
//*****************************************************************************
 
VOID
CleanupItem (
    HWND      hTreeWnd,
    HTREEITEM hTreeItem,
    PVOID pContext
)
{
    TV_ITEM tvi;
    PVOID   info = NULL;
 
    UNREFERENCED_PARAMETER(pContext);
 
    tvi.mask = TVIF_HANDLE | TVIF_PARAM;
    tvi.hItem = hTreeItem;
 
    TreeView_GetItem(hTreeWnd,
                     &tvi);
 
    info = (PVOID)tvi.lParam;
 
    if (info)
    {
        PCHAR                                  DriverKey = NULL;
        PUSB_NODE_INFORMATION                  HubInfo = NULL;
        PCHAR                                  HubName = NULL;
        PUSB_NODE_CONNECTION_INFORMATION_EX    ConnectionInfoEx = NULL;
        PUSB_DESCRIPTOR_REQUEST                ConfigDesc = NULL;
        PUSB_DESCRIPTOR_REQUEST                BosDesc = NULL;
        PSTRING_DESCRIPTOR_NODE                StringDescs = NULL;
        PUSB_HUB_INFORMATION_EX                HubInfoEx = NULL;
        PUSB_PORT_CONNECTOR_PROPERTIES         PortConnectorProps = NULL;
        PUSB_NODE_CONNECTION_INFORMATION_EX_V2 ConnectionInfoV2 = NULL;
        PUSB_HUB_CAPABILITIES_EX               HubCapabilityEx = NULL;
        PUSB_DEVICE_PNP_STRINGS                UsbDeviceProperties = NULL;
        PUSB_CONTROLLER_INFO_0                 ControllerInfo = NULL;
 
        //
        // All structures except DEVICE_INFO_NODE are free'd up here. DEVICE_INFO_NODE structures are free'd while
        // destroying device info lists (ClearDeviceList())
        // 
        switch (*(PUSBDEVICEINFOTYPE)info)
        {
            case HostControllerInfo:
                //
                // Remove this host controller from the list of enumerated
                // host controllers.
                //
                RemoveEntryList(&((PUSBHOSTCONTROLLERINFO)info)->ListEntry);
                DriverKey = ((PUSBHOSTCONTROLLERINFO)info)->DriverKey;
                ControllerInfo = ((PUSBHOSTCONTROLLERINFO)info)->ControllerInfo;
                UsbDeviceProperties = ((PUSBHOSTCONTROLLERINFO)info)->UsbDeviceProperties;
                break;
 
            case RootHubInfo:
                HubInfo = ((PUSBROOTHUBINFO)info)->HubInfo;
                HubInfoEx = ((PUSBROOTHUBINFO)info)->HubInfoEx;
                HubName = ((PUSBROOTHUBINFO)info)->HubName;
                PortConnectorProps = ((PUSBROOTHUBINFO)info)->PortConnectorProps;
                UsbDeviceProperties = ((PUSBROOTHUBINFO)info)->UsbDeviceProperties;
                HubCapabilityEx = ((PUSBROOTHUBINFO)info)->HubCapabilityEx;
                break;
 
            case ExternalHubInfo:
                HubInfo = ((PUSBEXTERNALHUBINFO)info)->HubInfo;
                HubInfoEx = ((PUSBEXTERNALHUBINFO)info)->HubInfoEx;
                HubName = ((PUSBEXTERNALHUBINFO)info)->HubName;
                ConnectionInfoEx = ((PUSBEXTERNALHUBINFO)info)->ConnectionInfo;
                PortConnectorProps = ((PUSBEXTERNALHUBINFO)info)->PortConnectorProps;
                ConfigDesc = ((PUSBEXTERNALHUBINFO)info)->ConfigDesc;
                BosDesc = ((PUSBEXTERNALHUBINFO)info)->BosDesc;
                StringDescs = ((PUSBEXTERNALHUBINFO)info)->StringDescs;
                ConnectionInfoV2 = ((PUSBEXTERNALHUBINFO)info)->ConnectionInfoV2;
                UsbDeviceProperties = ((PUSBEXTERNALHUBINFO)info)->UsbDeviceProperties;
                HubCapabilityEx = ((PUSBEXTERNALHUBINFO)info)->HubCapabilityEx;
                break;
 
            case DeviceInfo:
                ConnectionInfoEx = ((PUSBDEVICEINFO)info)->ConnectionInfo;
                PortConnectorProps = ((PUSBDEVICEINFO)info)->PortConnectorProps;
                ConfigDesc = ((PUSBDEVICEINFO)info)->ConfigDesc;
                BosDesc = ((PUSBDEVICEINFO)info)->BosDesc;
                StringDescs = ((PUSBDEVICEINFO)info)->StringDescs;
                ConnectionInfoV2 = ((PUSBDEVICEINFO)info)->ConnectionInfoV2;
                UsbDeviceProperties = ((PUSBDEVICEINFO)info)->UsbDeviceProperties;
                break;
        }
 
        if(UsbDeviceProperties)
        {
            FreeDeviceProperties(&UsbDeviceProperties);
        }
 
        if(ControllerInfo)
        {
            FREE(ControllerInfo);
        }
 
        if(HubCapabilityEx)
        {
            FREE(HubCapabilityEx);
        }
 
        if (DriverKey)
        {
            FREE(DriverKey);
        }
 
        if (HubInfo)
        {
            FREE(HubInfo);
        }
 
        if (HubName)
        {
            FREE(HubName);
        }
 
        if (ConfigDesc)
        {
            FREE(ConfigDesc);
        }
 
        if (BosDesc)
        {
            FREE(BosDesc);
        }
 
        if (StringDescs)
        {
            PSTRING_DESCRIPTOR_NODE Next;
 
            do {
 
                Next = StringDescs->Next;
                FREE(StringDescs);
                StringDescs = Next;
 
            } while (StringDescs);
        }
 
        if (ConnectionInfoEx)
        {
            FREE(ConnectionInfoEx);
        }
 
        if (HubInfoEx) 
        {
            FREE(HubInfoEx);        
        }
 
        if (PortConnectorProps)
        {
            FREE(PortConnectorProps);
        }
 
        if (ConnectionInfoV2)
        {
            FREE(ConnectionInfoV2);
        }
 
        FREE(info);
    }
}
 
//*****************************************************************************
//
// GetHostControllerPowerMap()
//
// HANDLE hHCDev
//      - handle to USB Host Controller
//
// PUSBHOSTCONTROLLERINFO hcInfo
//      - data structure to receive the Power Map Info
//
// return DWORD dwError
//      - return ERROR_SUCCESS or last error
//
//*****************************************************************************
 
DWORD
GetHostControllerPowerMap(
    HANDLE hHCDev, 
    PUSBHOSTCONTROLLERINFO hcInfo)
{
    USBUSER_POWER_INFO_REQUEST UsbPowerInfoRequest;
    PUSB_POWER_INFO            pUPI = &UsbPowerInfoRequest.PowerInformation ;
    DWORD                      dwError = 0;
    DWORD                      dwBytes = 0;
    BOOL                       bSuccess = FALSE;
    int                        nIndex = 0;
    int                        nPowerState = WdmUsbPowerSystemWorking;
 
    for ( ; nPowerState <= WdmUsbPowerSystemShutdown; nIndex++, nPowerState++) 
    {
        // zero initialize our request
        memset(&UsbPowerInfoRequest, 0, sizeof(UsbPowerInfoRequest));
 
        // set the header and request sizes
        UsbPowerInfoRequest.Header.UsbUserRequest = USBUSER_GET_POWER_STATE_MAP;
        UsbPowerInfoRequest.Header.RequestBufferLength = sizeof(UsbPowerInfoRequest);
        UsbPowerInfoRequest.PowerInformation.SystemState = nPowerState;
 
        //
        // Now query USBHUB for the USB_POWER_INFO structure for this hub.
        // For Selective Suspend support
        //
        bSuccess = DeviceIoControl(hHCDev,
                                  IOCTL_USB_USER_REQUEST,
                                  &UsbPowerInfoRequest,
                                  sizeof(UsbPowerInfoRequest),
                                  &UsbPowerInfoRequest,
                                  sizeof(UsbPowerInfoRequest),
                                  &dwBytes,
                                  NULL);
 
        if (!bSuccess)
        {
            dwError = GetLastError();
            OOPS();
        }
        else
        {
            // copy the data into our USB Host Controller's info structure
            memcpy( &(hcInfo->USBPowerInfo[nIndex]), pUPI, sizeof(USB_POWER_INFO));
        }
    }
 
    return dwError;
}
 
void
EnumerateAllDevices()
{
    EnumerateAllDevicesWithGuid(&gDeviceList, 
                                (LPGUID)&GUID_DEVINTERFACE_USB_DEVICE);
 
    EnumerateAllDevicesWithGuid(&gHubList, 
                                (LPGUID)&GUID_DEVINTERFACE_USB_HUB);
}
 
 
//*****************************************************************************
//
// GetHostControllerInfo()
//
// HANDLE hHCDev
//      - handle to USB Host Controller
//
// PUSBHOSTCONTROLLERINFO hcInfo
//      - data structure to receive the Power Map Info
//
// return DWORD dwError
//      - return ERROR_SUCCESS or last error
//
//*****************************************************************************
 
DWORD
GetHostControllerInfo(
    HANDLE hHCDev, 
    PUSBHOSTCONTROLLERINFO hcInfo)
{
    USBUSER_CONTROLLER_INFO_0 UsbControllerInfo;
    DWORD                      dwError = 0;
    DWORD                      dwBytes = 0;
    BOOL                       bSuccess = FALSE;
 
    memset(&UsbControllerInfo, 0, sizeof(UsbControllerInfo));
 
    // set the header and request sizes
    UsbControllerInfo.Header.UsbUserRequest = USBUSER_GET_CONTROLLER_INFO_0;
    UsbControllerInfo.Header.RequestBufferLength = sizeof(UsbControllerInfo);
 
    //
    // Query for the USB_CONTROLLER_INFO_0 structure
    //
    bSuccess = DeviceIoControl(hHCDev,
            IOCTL_USB_USER_REQUEST,
            &UsbControllerInfo,
            sizeof(UsbControllerInfo),
            &UsbControllerInfo,
            sizeof(UsbControllerInfo),
            &dwBytes,
            NULL);
 
    if (!bSuccess)
    {
        dwError = GetLastError();
        OOPS();
    }
    else
    {
        hcInfo->ControllerInfo = (PUSB_CONTROLLER_INFO_0) ALLOC(sizeof(USB_CONTROLLER_INFO_0));
        if(NULL == hcInfo->ControllerInfo)
        {
            dwError = GetLastError();
            OOPS();
        }
        else
        {
            // copy the data into our USB Host Controller's info structure
            memcpy(hcInfo->ControllerInfo, &UsbControllerInfo.Info0, sizeof(USB_CONTROLLER_INFO_0));
        }
    }
    return dwError;
}
 
_Success_(return == TRUE)
BOOL
GetDeviceProperty(
    _In_    HDEVINFO         DeviceInfoSet,
    _In_    PSP_DEVINFO_DATA DeviceInfoData,
    _In_    DWORD            Property,
    _Outptr_  LPTSTR        *ppBuffer
    )
{
    BOOL bResult;
    DWORD requiredLength = 0;
    DWORD lastError;
 
    if (ppBuffer == NULL)
    {
        return FALSE;
    }
 
    *ppBuffer = NULL;
 
    bResult = SetupDiGetDeviceRegistryProperty(DeviceInfoSet,
                                               DeviceInfoData,
                                               Property ,
                                               NULL,
                                               NULL,
                                               0,
                                               &requiredLength);
    lastError = GetLastError();
 
    if ((requiredLength == 0) || (bResult != FALSE && lastError != ERROR_INSUFFICIENT_BUFFER))
    {
        return FALSE;
    }
 
    *ppBuffer = ALLOC(requiredLength);
 
    if (*ppBuffer == NULL)
    {
        return FALSE;
    }
 
    bResult = SetupDiGetDeviceRegistryProperty(DeviceInfoSet,
                                                DeviceInfoData,
                                                Property ,
                                                NULL,
                                                (PBYTE) *ppBuffer,
                                                requiredLength,
                                                &requiredLength);
    if(bResult == FALSE)
    {
        FREE(*ppBuffer);
        *ppBuffer = NULL;
        return FALSE;
    }
 
    return TRUE;
}
 
 
void
EnumerateAllDevicesWithGuid(
    PDEVICE_GUID_LIST DeviceList, 
    LPGUID Guid
    )
{
    if (DeviceList->DeviceInfo != INVALID_HANDLE_VALUE)
    {
        ClearDeviceList(DeviceList);
    }
 
    DeviceList->DeviceInfo = SetupDiGetClassDevs(Guid,
                                     NULL,
                                     NULL,
                                     (DIGCF_PRESENT | DIGCF_DEVICEINTERFACE));
 
    if (DeviceList->DeviceInfo != INVALID_HANDLE_VALUE)
    {
        ULONG                    index;
        DWORD error;
 
        error = 0;
        index = 0;
 
        while (error != ERROR_NO_MORE_ITEMS)
        {
            BOOL success;
            PDEVICE_INFO_NODE pNode;
 
            pNode = ALLOC(sizeof(DEVICE_INFO_NODE));
            if (pNode == NULL)
            {
                OOPS();
                break;
            }
            pNode->DeviceInfo = DeviceList->DeviceInfo;
            pNode->DeviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
            pNode->DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
 
            success = SetupDiEnumDeviceInfo(DeviceList->DeviceInfo,
                                            index,
                                            &pNode->DeviceInfoData);
 
            index++;
 
            if (success == FALSE)
            {
                error = GetLastError();
 
                if (error != ERROR_NO_MORE_ITEMS)
                {
                    OOPS();
                }
 
                FreeDeviceInfoNode(&pNode);
            }
            else
            {
                BOOL   bResult;
                ULONG  requiredLength;
 
                bResult = GetDeviceProperty(DeviceList->DeviceInfo,
                                            &pNode->DeviceInfoData,
                                            SPDRP_DEVICEDESC,
                                            &pNode->DeviceDescName);
                if (bResult == FALSE)
                {
                    FreeDeviceInfoNode(&pNode);
                    OOPS();
                    break;
                }
 
                bResult = GetDeviceProperty(DeviceList->DeviceInfo,
                                            &pNode->DeviceInfoData,
                                            SPDRP_DRIVER,
                                            &pNode->DeviceDriverName);
                if (bResult == FALSE)
                {
                    FreeDeviceInfoNode(&pNode);
                    OOPS();
                    break;
                }
 
                pNode->DeviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
         
                success = SetupDiEnumDeviceInterfaces(DeviceList->DeviceInfo,
                                                      0,
                                                      Guid,
                                                      index-1,
                                                      &pNode->DeviceInterfaceData);
                if (!success)
                {
                    FreeDeviceInfoNode(&pNode);
                    OOPS();
                    break;
                }
              
                success = SetupDiGetDeviceInterfaceDetail(DeviceList->DeviceInfo,
                                                          &pNode->DeviceInterfaceData,
                                                          NULL,
                                                          0,
                                                          &requiredLength,
                                                          NULL);
         
                error = GetLastError();
                 
                if (!success && error != ERROR_INSUFFICIENT_BUFFER)
                {
                    FreeDeviceInfoNode(&pNode);
                    OOPS();
                    break;
                }
                 
                pNode->DeviceDetailData = ALLOC(requiredLength);
 
                if (pNode->DeviceDetailData == NULL)
                {
                    FreeDeviceInfoNode(&pNode);
                    OOPS();
                    break;
                }
                 
                pNode->DeviceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
                 
                success = SetupDiGetDeviceInterfaceDetail(DeviceList->DeviceInfo,
                                                          &pNode->DeviceInterfaceData,
                                                          pNode->DeviceDetailData,
                                                          requiredLength,
                                                          &requiredLength,
                                                          NULL);
                if (!success)
                {
                    FreeDeviceInfoNode(&pNode);
                    OOPS();
                    break;
                }        
         
                InsertTailList(&DeviceList->ListHead, &pNode->ListEntry);
            }
        }
    }
}
 
DEVICE_POWER_STATE
AcquireDevicePowerState(
    _Inout_ PDEVICE_INFO_NODE pNode
    )
{
    CM_POWER_DATA cmPowerData = {0};
    BOOL bResult;
 
    bResult =  SetupDiGetDeviceRegistryProperty(pNode->DeviceInfo,
                                               &pNode->DeviceInfoData,
                                               SPDRP_DEVICE_POWER_DATA,
                                               NULL,
                                               (PBYTE)&cmPowerData,
                                               sizeof(cmPowerData),
                                               NULL);
 
    pNode->LatestDevicePowerState = bResult ? cmPowerData.PD_MostRecentPowerState : PowerDeviceUnspecified;
 
    return pNode->LatestDevicePowerState; 
}
 
 
void
ClearDeviceList(
    PDEVICE_GUID_LIST DeviceList
    )
{
    if (DeviceList->DeviceInfo != INVALID_HANDLE_VALUE)
    {
        SetupDiDestroyDeviceInfoList(DeviceList->DeviceInfo);
        DeviceList->DeviceInfo = INVALID_HANDLE_VALUE;
    }
 
    while (!IsListEmpty(&DeviceList->ListHead))
    {
        PDEVICE_INFO_NODE pNode = NULL;
        PLIST_ENTRY pEntry;
 
        pEntry = RemoveHeadList(&DeviceList->ListHead);
 
        pNode = CONTAINING_RECORD(pEntry,
                                  DEVICE_INFO_NODE,
                                  ListEntry);
 
        FreeDeviceInfoNode(&pNode);
    }
}
 
VOID
FreeDeviceInfoNode(
    _In_ PDEVICE_INFO_NODE *ppNode
    )
{
    if (ppNode == NULL)
    {
        return;
    }
 
    if (*ppNode == NULL)
    {
        return;
    }
 
    if ((*ppNode)->DeviceDetailData != NULL)
    {
        FREE((*ppNode)->DeviceDetailData);
    }
 
    if ((*ppNode)->DeviceDescName != NULL)
    {
        FREE((*ppNode)->DeviceDescName);
    }
 
    if ((*ppNode)->DeviceDriverName != NULL)
    {
        FREE((*ppNode)->DeviceDriverName);
    }
 
    FREE(*ppNode);
    *ppNode = NULL;
}
 
PDEVICE_INFO_NODE
FindMatchingDeviceNodeForDriverName(
    _In_ PSTR   DriverKeyName,
    _In_ BOOLEAN IsHub
    )
{
    PDEVICE_INFO_NODE pNode  = NULL;
    PDEVICE_GUID_LIST pList  = NULL;
    PLIST_ENTRY       pEntry = NULL;
 
    pList = IsHub ? &gHubList : &gDeviceList;
 
    pEntry = pList->ListHead.Flink;
 
    while (pEntry != &pList->ListHead)
    {
        pNode = CONTAINING_RECORD(pEntry,
                                  DEVICE_INFO_NODE,
                                  ListEntry);
        if (_stricmp(DriverKeyName, pNode->DeviceDriverName) == 0)
        {
            return pNode;
        }
 
        pEntry = pEntry->Flink;
    }
     
    return NULL;
}
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