VC GDI+ 窗口截图内存BMP转JPG,压缩、JPG再转IStream流，IStream流再转 BYTE

最近用到 PC远程监控，用GDI+屏幕截图内存BMP转JPG，压缩 ,JPG再转IStream流，IStream流再转BYTE，通过SOCKET 转发；

/****************BMP转JPG*********用法示例**************************Bitmap newbitmap(L"d:\\d.bmp");//加载BMP
const unsigned short *pFileName=L"d:\\new.jpg";//保存路径
SaveFile(&newbitmap,pFileName );************************************************************/void SaveFile(Bitmap* pImage, const wchar_t* pFileName)//
{EncoderParameters encoderParameters;CLSID jpgClsid; GetEncoderClsid(L"image/jpeg", &jpgClsid);encoderParameters.Count = 1;encoderParameters.Parameter[0].Guid = EncoderQuality;encoderParameters.Parameter[0].Type = EncoderParameterValueTypeLong;encoderParameters.Parameter[0].NumberOfValues = 1;// Save the image as a JPEG with quality level 100.ULONG             quality;quality = 100;encoderParameters.Parameter[0].Value = &quality;Status status = pImage->Save(pFileName, &jpgClsid, &encoderParameters);if (status != Ok) {wprintf(L"%d Attempt to save %s failed.\n", status, pFileName);}
}

/****************BMP转JPG 压缩 转字节流*********用法示例**************************// 将当前屏幕保存成为jpg图片
// 参数   xs = 图象x轴大小 (压缩后)  ys = 图象y轴大小(压缩后) ,   quality = jpeg图象质量  ************************************************************/void SaveCurScreenJpg(LPCWSTR   pszFileName,   int   xs,   int   ys,   int   quality)
{   HWND hwnd = ::GetDesktopWindow();   HDC hdc = GetWindowDC(NULL);   int x = GetDeviceCaps(hdc, HORZRES);   int y = GetDeviceCaps(hdc, VERTRES);   HBITMAP hbmp = ::CreateCompatibleBitmap(hdc, x, y), hold;   HDC hmemdc = ::CreateCompatibleDC(hdc);   hold = (HBITMAP)::SelectObject(hmemdc,   hbmp);   BitBlt(hmemdc, 0, 0, x, y, hdc, 0, 0, SRCCOPY);   SelectObject(hmemdc, hold);   Bitmap bit(xs, ys), bit2(hbmp, NULL);   Graphics g(&bit);   g.ScaleTransform((float)xs/x,   (float)ys/y);   g.DrawImage(&bit2,   0,   0);   CLSID                           encoderClsid;   EncoderParameters   encoderParameters;   encoderParameters.Count   =   1;   encoderParameters.Parameter[0].Guid   =   EncoderQuality;   encoderParameters.Parameter[0].Type   =   EncoderParameterValueTypeLong;   encoderParameters.Parameter[0].NumberOfValues   =   1;   encoderParameters.Parameter[0].Value   =   &quality;   GetEncoderClsid(L"image/jpeg",   &encoderClsid);   bit.Save(pszFileName,   &encoderClsid,   &encoderParameters);   IStream *stream = NULL;if( ::CreateStreamOnHGlobal( NULL, TRUE, &stream ) != S_OK ){return  ;}/* save the image to stream */VOID * outbuf = NULL;size_t nDatalen =0;/* read the stream to buffer */if( !stream_to_mem( stream, &outbuf, &nDatalen  ) ){stream->Release();//return  ;}stream->Release();///可以把数据流通过 线程 socket  发送出去；free(outbuf);::DeleteObject(hbmp);   ::DeleteObject(hmemdc);   return;
}  /****************stream_to_mem **************************Stream to byte
************************************************************/
static bool stream_to_mem( IStream *stream, void **outbuf, size_t *size )
{ULARGE_INTEGER ulnSize;LARGE_INTEGER lnOffset;lnOffset.QuadPart = 0;/* get the stream size */if( stream->Seek( lnOffset, STREAM_SEEK_END, &ulnSize ) != S_OK ){return false;}if( stream->Seek( lnOffset, STREAM_SEEK_SET, NULL ) != S_OK ){return false;}/* read it */*outbuf = malloc( (size_t)ulnSize.QuadPart );*size = (size_t) ulnSize.QuadPart;ULONG bytesRead;if( stream->Read( *outbuf, (ULONG)ulnSize.QuadPart, &bytesRead ) != S_OK ){free( *outbuf );return false;}return true;
}同时还用到了一个函数
int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{   UINT num = 0;                     // number of image encoders   UINT size = 0;                   // size of the image encoder array in bytes   ImageCodecInfo* pImageCodecInfo = NULL;   GetImageEncodersSize(&num, &size);   if(size == 0)   return -1;     //   Failure   pImageCodecInfo = (ImageCodecInfo*)(malloc(size));   if(pImageCodecInfo == NULL)   return -1;     //   Failure   GetImageEncoders(num, size, pImageCodecInfo);   for(UINT j = 0; j < num; ++j)   {   if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )   {   *pClsid = pImageCodecInfo[j].Clsid;   free(pImageCodecInfo);   return j;     //   Success   }           }   free(pImageCodecInfo);   return -1;     //   Failure
}demo

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VC GDI+ 窗口截图内存BMP转JPG,压缩、JPG再转IStream流，IStream流再转 BYTE

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