实现回放中视频图像抓取的源码

bool CDXGraph::SnapshotBitmap(const char * outFile)

{

       if (mBasicVideo)

       {

              long bitmapSize = 0;

              if (SUCCEEDED(mBasicVideo->GetCurrentImage(&bitmapSize, 0)))

              {

                     bool pass = false;

                     unsigned char * buffer = new unsigned char[bitmapSize];

if (SUCCEEDED(mBasicVideo->GetCurrentImage(&bitmapSize, (long *)buffer)))

                     {

                            BITMAPFILEHEADER       hdr;

                            LPBITMAPINFOHEADER       lpbi;

                            lpbi = (LPBITMAPINFOHEADER)buffer;

                            int nColors = 1 << lpbi->biBitCount;

                            if (nColors > 256)       nColors = 0;

                            hdr.bfType              = ((WORD) ('M' << 8) | 'B');       //always is "BM"

                            hdr.bfSize              = bitmapSize + sizeof( hdr );

                            hdr.bfReserved1       = 0;

                            hdr.bfReserved2       = 0;

hdr.bfOff             Bits = (DWORD) (sizeof(BITMAPFILEHEADER) + lpbi->biSize + nColors *sizeof        (RGBQUAD));

CFile bitma            pFile(outFile, CFile::modeReadWrite | CFile::modeCreate | CFile::typeBinary);

                            bitmapFile.Write(&hdr, sizeof(BITMAPFILEHEADER));

                            bitmapFile.Write(buffer, bitmapSize);

                            bitmapFile.Close();

                            pass = true;

                     }

                     delete [] buffer;

                     return pass;

              }

       }

       return false;

}}

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