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)
}