GDI+中使用Image从IStream创建图像

   首先：创建内存文件，并将数据放入

       BYTE* lpDataImg=new BYTE[length];

       memcpy(lpDataImg,lpData,length);

       m_image=NULL;

       CMemFile memFile(lpData,length);

       int size=memFile.GetLength();

       IStream* pStmBmp = NULL;

       HGLOBAL hMemBmp = GlobalAlloc(GMEM_FIXED, size);

       if (hMemBmp == NULL) return;

 创建流：

       CreateStreamOnHGlobal(hMemBmp, FALSE, &pStmBmp);

       if (pStmBmp == NULL)

       {

              GlobalFree(hMemBmp);

       }

 

       BYTE* pbyBmp = (BYTE *)GlobalLock(hMemBmp);

       memFile.SeekToBegin();

       memFile.Read(pbyBmp, size);

 

       m_image=new Image(pStmBmp,FALSE);

       if(m_image==NULL)

       {

              GlobalFree(hMemBmp);

              delete lpDataImg;

       }

       m_ImageData.nWidth=m_image->GetWidth();

       m_ImageData.nHeight=m_image->GetHeight();

       delete lpDataImg;