Sample Code
Windows Driver Samples/ WPD WUDF sample driver/ C++/ WpdObjectEnum.h/
#pragma once // This class is used to store the context for a specific enumeration. // Currrently, this is done by storing the object index. class EnumContext : public IUnknown { public: EnumContext() : m_cRef(1), SearchIndex(0) { } ~EnumContext() { } 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; } public: DWORD SearchIndex; CAtlStringW ParentID; private: DWORD m_cRef; }; class WpdObjectEnumerator { public: WpdObjectEnumerator(); ~WpdObjectEnumerator(); HRESULT Initialize(_In_ FakeDevice *pFakeDevice); 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: HRESULT CreateEnumContext( _In_ ContextMap* pContextMap, _In_ LPCWSTR pszParentID, _Outptr_result_nullonfailure_ LPWSTR* ppszEnumContext); HRESULT DestroyEnumContext( _In_ ContextMap* pContextMap, _In_ LPCWSTR pszEnumContext); HRESULT GetObjectIDs( _In_ ContextMap* pContextMap, _In_ const DWORD dwNumObjects, _In_ LPCWSTR pszEnumContext, _COM_Outptr_ IPortableDevicePropVariantCollection** ppCollection); FakeDevice* m_pFakeDevice; };
Our Services
-
What our customers say about us?
Read our customer testimonials to find out why our clients keep returning for their projects.
View Testimonials