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> HDC hMemDC; 
>     hMemDC=::CreateCompatibleDC(hdc); 
> //      HBITMAP hBM=::CreateCompatibleBitmap(dc.m_ps.hdc,rect.right-rect.left,rect.bottom-rect.top); 
> //      HBITMAP hOldBM=(HBITMAP)SelectObject(hMemDC,hBM); 
>      
>     SetBkMode(hMemDC,OPAQUE);  
> //    SetBkMode(hMemDC,TRANSPARENT); 
>     SetBkColor(hMemDC,RGB(255,0,0));  
>         GetClientRect(&rect); 
>   ::FillRect(hMemDC,&rect,(HBRUSH)GetStockObject(BLACK_BRUSH)); 
>   ::BitBlt(hdc,rect.left,rect.top,rect.right-rect.left,rect.bottom-rect.top,hMemDC,0,0,SRCCOPY); 
>    
>   DeleteObject(hMemDC); 
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        RECT    rect;
        HDC hdc=pDC->m_hDC;
        GetClientRect(&rect);

        // create display memory DC
        HDC hMemDC=::CreateCompatibleDC(hdc);
        // create new bitmap
        HBITMAP bm=::CreateCompatibleBitmap(hdc,rect.right,rect.bottom);
        // select new bitmap and save old
        HBITMAP hOldBM=(HBITMAP)SelectObject(hMemDC,bm);

   ::FillRect(hMemDC,&rect,(HBRUSH)GetStockObject(BLACK_BRUSH));
   ::BitBlt(hdc,rect.left,rect.top,rect.right-rect.left,
           rect.bottom-rect.top,hMemDC,0,0,SRCCOPY);

   SelectObject(hMemDC,hOldBM);

��MFC��
        CDC             *m_pMemDC;
        CRect   rect;
        GetClientRect(&rect);

// create display memory DC
        m_pMemDC=new CDC;
        m_pMemDC->CreateCompatibleDC(pDC);

// create new bitmap
        CBitmap *pBitmap=new CBitmap;
        pBitmap->CreateCompatibleBitmap(pDC,rect.right,rect.bottom);

// select new bitmap and save old
        CBitmap *pOldBitmap=(CBitmap *)m_pMemDC->SelectObject(pBitmap);

        CBrush  backgroundBrush
                ((COLORREF)::GetSysColor(COLOR_3DFACE));
        CBrush  *pOldBrush=m_pMemDC->SelectObject(&backgroundBrush);
        m_pMemDC->PatBlt(0,0,rect.right,rect.bottom,PATCOPY);

        pDC->BitBlt(rect.left,rect.top,
                rect.Width(),rect.Height(),m_pMemDC,
                rect.left,rect.top,SRCCOPY);

        m_pMemDC->SelectObject(pOldBitmap);
        m_pMemDC->SelectObject(pOldBrush);


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 * Origin: NJU PowerBBS <bbs.nju.edu.cn>