为什么小弟我这个代码不能把图片拷贝到小弟我的打印DC上呢，请大家帮忙看看，多谢了

    hBitmap = LoadBitmap(AfxGetInstanceHandle(), TEXT ("Bricks")) ;
    GetObject (hBitmap, sizeof (BITMAP), &bitmap) ;
    int cxSource = bitmap.bmWidth ;
    int cySource = bitmap.bmHeight ;

    hdcMem = CreateCompatibleDC (hdcprint) ;
    SelectObject (hdcMem, hBitmap) ;

    BitBlt (hdcprint, 20, 40, cxSource, cySource, hdcMem, 0, 0, SRCCOPY) ;

    DeleteDC (hdcMem);