記憶體緩衝作圖

void C***View::OnPaint() 

{

    CPaintDC dc(this); 

    RECT rect;

    GetClientRect(&rect);

    CBitmap *bitmap;

    bitmap=new CBitmap;

    bitmap->m_hObject=(HBITMAP)::LoadImage(NULL,"0.bmp",IMAGE_BITMAP,rect.right,rect.bottom,LR_LOADFROMFILE);


    CDC *mdc;

    mdc=new CDC;

    mdc->CreateCompatibleDC(&dc);

    mdc->SelectStockObject(BLACK_BRUSH);

    mdc->SelectObject(bitmap);//先載入位元影像

    mdc->Rectangle(0,0,300,300);    //再操作記憶體dc作圖

    dc.BitBlt(0,0,rect.right,rect.bottom,mdc,0,0,SRCCOPY);//拷貝顯示

    delete mdc;

}