使用DirectShow驱动摄像头

CComPtr<ICaptureGraphBuilder2> m_pCapture;

DWORD m_dwGraphRegister;

bool bInit(HWND hWnd)

{

HRESULT hr;

//获得接口

hr=CoCreateInstance (CLSID_FilterGraph, NULL, CLSCTX_INPROC,

IID_IGraphBuilder, (void **) &m_pGraph);

if (FAILED(hr))

return false;

hr=CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,

IID_ICaptureGraphBuilder2, (void **) &m_pCapture);

if (FAILED(hr))

return false;

m_pMC=m_pGraph;

m_pVW=m_pGraph;

m_pME=m_pGraph;

//取得消息

m_pME->SetNotifyWindow((OAHWND)(m_hWnd=hWnd), WM_GRAPHNOTIFY, 0);