Directshow抓图

   1: //Capture bitmap form directshow by IVMRWindowlessControl9 interface

   2: HRESULT CaptureBitmap(IVMRWindowlessControl9 *pVMRControl9, int destWidth, int destHeight, LPCWSTR fileName)

   3: {

   4:     BYTE* pDib = NULL;

   5:     HRESULT hr = pVMRControl9->GetCurrentImage(&pDib);

   6:     if (FAILED(hr))

   7:         return hr;

   8:  

   9:     BITMAPINFO* pBitmapInfo = (BITMAPINFO*)pDib;

  10:     HDC hScreenDC = ::GetDC(NULL);

  11:     ASSERT(hScreenDC != NULL);

  12:     void* pBits = pDib + sizeof(BITMAPINFOHEADER);

  13:     HBITMAP hBitmap = ::CreateDIBitmap(hScreenDC,&(pBitmapInfo->bmiHeader),CBM_INIT,pBits,pBitmapInfo,DIB_RGB_COLORS);

  14:     //

  15:     //Do something with hBitmap here

  16:     //

  17:     ::DeleteObject(hBitmap);

  18:     ::ReleaseDC(NULL,hScreenDC);

  19:     ::CoTaskMemFree(pDib);

  20:  

  21:     return hr;

  22: }