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copied!<p>OK, after a lot of effort here's the answer:</p> <pre><code>int SaveJpeg(HBITMAP hBmp, LPCWSTR lpszFilename, ULONG uQuality) { ULONG *pBitmap = NULL; CLSID imageCLSID; EncoderParameters encoderParams; int iRes = 0; typedef Status (WINAPI *pGdipCreateBitmapFromHBITMAP)(HBITMAP, HPALETTE, ULONG**); pGdipCreateBitmapFromHBITMAP lGdipCreateBitmapFromHBITMAP; typedef Status (WINAPI *pGdipSaveImageToFile)(ULONG *, const WCHAR*, const CLSID*, const EncoderParameters*); pGdipSaveImageToFile lGdipSaveImageToFile; // load GdipCreateBitmapFromHBITMAP lGdipCreateBitmapFromHBITMAP = (pGdipCreateBitmapFromHBITMAP)GetProcAddress(hModuleThread, "GdipCreateBitmapFromHBITMAP"); if(lGdipCreateBitmapFromHBITMAP == NULL) { // error return 0; } // load GdipSaveImageToFile lGdipSaveImageToFile = (pGdipSaveImageToFile)GetProcAddress(hModuleThread, "GdipSaveImageToFile"); if(lGdipSaveImageToFile == NULL) { // error return 0; } lGdipCreateBitmapFromHBITMAP(hBmp, NULL, &pBitmap); iRes = GetEncoderClsid(L"image/jpeg", &imageCLSID); if(iRes == -1) { // error return 0; } encoderParams.Count = 1; encoderParams.Parameter[0].NumberOfValues = 1; encoderParams.Parameter[0].Guid = EncoderQuality; encoderParams.Parameter[0].Type = EncoderParameterValueTypeLong; encoderParams.Parameter[0].Value = &uQuality; lGdipSaveImageToFile(pBitmap, lpszFilename, &imageCLSID, &encoderParams); return 1; } </code></pre> <ul> <li><p>what is hModuleThread? Look in <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms683212%28v=vs.85%29.aspx" rel="noreferrer">here</a>. You can replace with <code>GetModuleHandle()</code></p></li> <li><p>what is GetEncoderClsid? Look <a href="http://msdn.microsoft.com/en-us/library/ms533843%28v=vs.85%29.aspx" rel="noreferrer">here</a>.</p></li> </ul> <p>Now the question is, how do I save the encoded pBitmap (as a jpeg) into a BYTE buffer?</p>

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