Sample Code
Windows Driver Samples/ Toaster Sample Driver/ C++/ umdf/ Toastmon/ Driver.cpp/
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | /*++ Copyright (C) Microsoft Corporation, All Rights Reserved. Module Name: Driver.cpp Abstract: This module contains the implementation of the UMDF Sample's core driver callback object. Environment: Windows User-Mode Driver Framework (WUDF) --*/ #include "internal.h" #include "driver.tmh" HRESULT CMyDriver::CreateInstance( _Out_ PCMyDriver * MyDriver ) /*++ Routine Description: This static method is invoked in order to create and initialize a new instance of the driver class. The caller should arrange for the object to be released when it is no longer in use. Arguments: MyDriver - a location to store a referenced pointer to the new instance Return Value: S_OK if successful, or error otherwise. --*/ { PCMyDriver myDriver; HRESULT hr; // // Allocate the callback object. // myDriver = new CMyDriver(); if (NULL == myDriver) { return E_OUTOFMEMORY; } // // Initialize the callback object. // hr = myDriver->Initialize(); if (SUCCEEDED(hr)) { // // Store a pointer to the new, initialized object in the output // parameter. // *MyDriver = myDriver; } else { // // Release the reference on the driver object to get it to delete // itself. // myDriver->Release(); } return hr; } HRESULT CMyDriver::Initialize( VOID ) /*++ Routine Description: This method is called to initialize a newly created driver callback object before it is returned to the creator. Unlike the constructor, the Initialize method contains operations which could potentially fail. Arguments: None Return Value: None --*/ { return S_OK; } HRESULT CMyDriver::QueryInterface( _In_ REFIID InterfaceId, _Out_ PVOID *Interface ) /*++ Routine Description: This method returns a pointer to the requested interface on the callback object. Arguments: InterfaceId - the IID of the interface to query/reference Interface - a location to store the interface pointer. Return Value: S_OK if the interface is supported. E_NOINTERFACE if it is not supported. --*/ { if (IsEqualIID(InterfaceId, __uuidof(IDriverEntry))) { *Interface = QueryIDriverEntry(); return S_OK; } else { return CUnknown::QueryInterface(InterfaceId, Interface); } } HRESULT CMyDriver::OnDeviceAdd( _In_ IWDFDriver *FxDriver, _In_ IWDFDeviceInitialize *FxDeviceInit ) /*++ Routine Description: The FX invokes this method when it wants to install our driver on a device stack. This method creates a device callback object, then calls the Fx to create an Fx device object and associate the new callback object with it. Arguments: FxWdfDriver - the Fx driver object. FxDeviceInit - the initialization information for the device. Return Value: status --*/ { PCMyDevice myDevice = NULL; HRESULT hr; // // Create a new instance of our device callback object // hr = CMyDevice::CreateInstance(FxDriver, FxDeviceInit, &myDevice); // // If that succeeded then call the device's construct method. This // allows the device to create any queues or other structures that it // needs now that the corresponding fx device object has been created. // if (SUCCEEDED(hr)) { hr = myDevice->Configure(); } // // Release the reference on the device callback object now that it's been // associated with an fx device object. // if (NULL != myDevice) { myDevice->Release(); } return hr; } |
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