VC++使用CImage在内存中Bmp转换Jpeg图片

unsigned long BMP2JPEG(char* pUnZipData,unsigned long ulUnZipDataLen,char** pBuffer)

{

    unsigned long ulBufferLen = 0;

    HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, ulUnZipDataLen); 

    void* pData = GlobalLock(hGlobal); 

    memcpy(pData, pUnZipData, ulUnZipDataLen); 

    GlobalUnlock(hGlobal); 

    IStream* pStream = NULL; 

    if(CreateStreamOnHGlobal(hGlobal, TRUE,  & pStream) == S_OK) 

    {

        CImage image; 

        if (SUCCEEDED(image.Load(pStream))) 

        {

            IStream* pOutStream = NULL; 

            if(CreateStreamOnHGlobal(NULL, TRUE,  & pOutStream) == S_OK) 

            {

                image.Save(pOutStream, Gdiplus::ImageFormatJPEG);

                HGLOBAL hOutGlobal= NULL;

                GetHGlobalFromStream(pOutStream,&hOutGlobal);

                LPBYTE pBits= (LPBYTE)GlobalLock(hOutGlobal);

                ulBufferLen =(DWORD)GlobalSize(pBits);

                *pBuffer = new char[ulBufferLen];

                memcpy(*pBuffer, pBits, ulBufferLen);

                 

                GlobalUnlock(hOutGlobal);

                pOutStream->Release();

            }

        }  

        pStream->Release();      

    }  

    GlobalFree(hGlobal); 

    return ulBufferLen;

}