Sample Code
Windows Driver Samples/ WPD service sample driver/ C++/ WpdObjectEnum.h/
#pragma once // This class is used to store the context for a specific enumeration. class WpdObjectEnumeratorContext : public IUnknown { public: WpdObjectEnumeratorContext() : m_cRef(1), m_TotalChildren(0), m_ChildrenEnumerated(0), m_Scope(FULL_DEVICE_ACCESS) { } ~WpdObjectEnumeratorContext() { } 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; public: bool HasMoreChildrenToEnumerate() { return ((m_TotalChildren - m_ChildrenEnumerated) > 0); } // WpdObjectEnumeratorContext specific data public: ACCESS_SCOPE m_Scope; CAtlStringW m_strParentObjectID; // object identifier of the object whose children are being enumerated DWORD m_TotalChildren; // number of bytes transferred from the resource to the caller DWORD m_ChildrenEnumerated; // number of children returned during the enumeration operation }; class WpdObjectEnumerator { public: WpdObjectEnumerator(); virtual ~WpdObjectEnumerator(); HRESULT Initialize(_In_ FakeDevice* pDevice); HRESULT DispatchWpdMessage( _In_ REFPROPERTYKEY Command, _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnStartFind( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnFindNext( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); HRESULT OnEndFind( _In_ IPortableDeviceValues* pParams, _In_ IPortableDeviceValues* pResults); private: FakeDevice* m_pDevice; };
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