如何访问预定义的GDI对象

 可以通过调用CDC:: SlectStockObject使用Windows的几个预定义的对象，诸
如刷子、笔以及字体。下例使用了Windows预定义的笔和刷子GDI对象在视窗中画一
个椭圆。
//Draw ellipse using stock black pen and gray brush.
void CSampleView:: OnDraw (CDC* pDC)
{
     //Determine size of view.
     CRect rcView;
     GetClientRect (rcView);

     //Use stock black pen and stock gray brush to draw ellipse.
     pDC->SelectStockObject (BLACK_PEN);
     pDC->SelectStockObject (GRAY_BRUSH)
     //Draw the ellipse.
     pDC->Ellipse (reView);
}
    也可以调用新的SDK函数GetSysColorBrush获取一个系统颜色刷子，下例用背景
色在视窗中画一个椭圆：
void CsampleView:: OnDraw (CDC* pDC)
{
     //Determine size of view.
     CRect rcView;
     GetClientRect (rcView);

     //Use background color for tooltips brush.
     CBrush * pOrgBrush=pDC->SelectObject (
          CBrush::FromHandle (::GetSysColorBrush (COLOR_INFOBK)));

     //Draw the ellipse.
     pDC->Ellipse (rcView);

     //Restore original brush.
     pDC->SelectObject (pOrgBrush);
}