Sample Code
Windows Driver Samples/ WPD service sample driver/ C++/ WpdObjectResources.h/
#pragma once #define FILE_OPTIMAL_READ_BUFFER_SIZE_VALUE (2 * 1024 * 1024) #define FILE_OPTIMAL_WRITE_BUFFER_SIZE_VALUE (2 * 1024 * 1024) // This class is used to store the context for a specific resource operation. class WpdObjectResourceContext : public IUnknown { public: WpdObjectResourceContext() : m_cRef(1), m_Resource(WPD_RESOURCE_DEFAULT), m_BytesTransferred(0), m_BytesTotal(0), m_Scope(FULL_DEVICE_ACCESS) { } ~WpdObjectResourceContext() { } public: // IUnknown ULONG __stdcall AddRef() { InterlockedIncrement((long*) &m_cRef); return m_cRef; } _At_(this, __drv_freesMem(Mem)) ULONG __stdcall Release() { ULONG ulRefCount = m_cRef - 1; if (InterlockedDecrement((long*) &m_cRef) == 0) { delete this; return 0; } return ulRefCount; } HRESULT __stdcall QueryInterface( REFIID riid, void** ppv) { HRESULT hr = S_OK; if(riid == IID_IUnknown) { *ppv = static_cast<IUnknown*>(this); AddRef(); } else { *ppv = NULL; hr = E_NOINTERFACE; } return hr; } private: DWORD m_cRef; // WpdObjectResourceContext specific data public: CAtlStringW m_strObjectID; // object identifier of the object whose resource is being transferred PROPERTYKEY m_Resource; // the specific resource being transferred ULONGLONG m_BytesTransferred; // number of bytes transferred from the resource to the caller ULONGLONG m_BytesTotal; // total number of bytes of the resource data ACCESS_SCOPE m_Scope; // client access scope }; class WpdObjectResources { public: WpdObjectResources(); virtual ~WpdObjectResources(); HRESULT Initialize(_In_ FakeDevice* pDevice); HRESULT DispatchWpdMessage( _In_ REFPROPERTYKEY Command, _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnGetSupportedResources( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnGetResourceAttributes( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnOpenResource( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnReadResource( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnCloseResource( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); private: FakeDevice* m_pDevice; };
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