IStream* IImage *终于搞定了！

             感觉还是不够细心，没有看IImage 接口的源码，非要到走投无路时才去瞄一下，图形图象确实要细心，总算搞定了，这个周末可以休息下了，看了多普达S1精英版好长时间了，周末去把它买了！谗了我好久了。


HBITMAP CImageLoader::loadImageFile( CString &strFileName)
{    

   int  n_start=0,n_end=0;

 GetPos(n_start,n_end,strFileName);

 CString m_filename(L"1.data");//文件名

 CFile m_file(m_filename,CFile::modeRead );

 m_file.Seek(n_start,CFile::begin);
 //获取文件长度
 DWORD m_filelen =n_end-n_start;//m_file.GetLength()

 CString str=L"^-^";
 str.Format(L"%d",m_filelen);
 AfxMessageBox(str);
 //在堆上分配空间
 HGLOBAL m_hglobal = GlobalAlloc(GMEM_MOVEABLE,m_filelen);

 LPVOID pvdata = NULL;
 //锁定堆空间,获取指向堆空间的指针
 pvdata = GlobalLock(m_hglobal);

 //将文件数据读区到堆中
 m_file.Read(pvdata,m_filelen);

 IStream*  m_stream;

 GlobalUnlock(m_hglobal);

 //在堆中创建流对象
 CreateStreamOnHGlobal(m_hglobal,TRUE,&m_stream);

    IImagingFactory *pImgFactory =NULL; 
    IImage *pImage =NULL; 
    CoInitializeEx(NULL,COINIT_MULTITHREADED);
   HBITMAP hResult =0; 
    if   (SUCCEEDED(CoCreateInstance(CLSID_ImagingFactory, 
                                     NULL, 
                                     CLSCTX_INPROC_SERVER, 
                                     IID_IImagingFactory, 
                                     (void   **)&pImgFactory))) 
 { 
  ImageInfo imageInfo;  
      //直接将流数据传进去
       if(SUCCEEDED(pImgFactory->CreateImageFromStream(m_stream,&pImage)) 
    // if(SUCCEEDED(pImgFactory->CreateImageFromFile(strFileName,&pImage))
     && SUCCEEDED(pImage->GetImageInfo(&imageInfo))) 
        { 
   CWindowDC dc(0); 
   CDC dcBitmap; 
   dcBitmap.CreateCompatibleDC(&dc); 
   hResult =CreateCompatibleBitmap(dc.GetSafeHdc(),imageInfo.Width,imageInfo.Height); 
   if(hResult){ 
    HGDIOBJ   hOldBitmap   =   dcBitmap.SelectObject(hResult); 
                pImage->Draw(dcBitmap.GetSafeHdc(),CRect(0,0,imageInfo.Width,imageInfo.Height),NULL); 
    dcBitmap.SelectObject(hOldBitmap); 
    
   } 
   pImage->Release(); 
        }

        pImgFactory->Release(); 
     
 }
    CoUninitialize(); 
 
 return hResult;
}