IPicture接口导入jpg、bmp图片

void CTestDemoView::OnDraw(CDC* pDC)

{

    CTestDemoDoc* pDoc = GetDocument();

    ASSERT_VALID(pDoc);

    if (!pDoc)

       return;

 

    // TODO: 在此处为本机数据添加绘制代码

    m_sPath = _T("C://Angel Light.jpg");

      

 

 

    IPicture* pPicture = NULL;

    LPSTREAM  pStream  = NULL;

   

    CFileStatus cFileStatus;

    CFile       cFile;

 

    LONG  nSize;

    int   nWidth = 0,nHeight = 0;

    HGLOBAL hGlobal = NULL;

    LPVOID  lpData  = NULL;

   

    if ( cFile.Open(m_sPath,CFile::modeRead))

    {

       cFile.GetStatus(m_sPath,cFileStatus);

       nSize = (long)cFileStatus.m_size;

      

       hGlobal = ::GlobalAlloc(GMEM_MOVEABLE,nSize);//分配全局内存

       if ((hGlobal != NULL) )

       {

          lpData = ::GlobalLock(hGlobal);

         if ( lpData != NULL)

         {

             cFile.Read(lpData,nSize);

             ::GlobalUnlock(hGlobal);

             ::CreateStreamOnHGlobal(hGlobal,TRUE,&pStream);

 

             //基于流创建文件

             if( SUCCEEDED(::OleLoadPicture(pStream,nSize,TRUE,IID_IPicture,(LPVOID*)&pPicture)))

             {

                OLE_XSIZE_HIMETRIC  hmWidth = 0;

                OLE_YSIZE_HIMETRIC  hmHeight = 0;

 

                pPicture->get_Width(&hmWidth);

                pPicture->get_Height(&hmHeight);

 

                //转换宽度

                nWidth  = pDC->GetDeviceCaps(HORZRES);//物理显示宽度（以毫米为单位）

                nHeight = pDC->GetDeviceCaps(VERTRES);//物理显示高度（以毫米为单位）

 

             

                CRect rect;

                this->GetClientRect(&rect);

                nWidth  = rect.Width();//图片显示的宽度

                nHeight = rect.Height();//图片显示的高度

             

               

                if ( FAILED(pPicture->Render(pDC->m_hDC,0,0,nWidth,nHeight,0,hmHeight,hmWidth,-hmHeight,NULL)))

                   

                {

                    AfxMessageBox(_T("Failed to render"),MB_OK);

                }

                pPicture->Release();

 

             }

         }

 

       }

    }

   

 

}