CPen Pen;
Pen.CreatePen(PS_INSIDEFRAME,1,RGB(225,225,0));
CBrush Brush;
Brush.CreateSolidBrush(RGB(225,225,0));
CDC dcMem;
CBitmap bm;
CRect rc;
GetClientRect(&rc);
// Step 1:为屏幕DC创建兼容的内存DC :CreateCompatibleDC()
dcMem.CreateCompatibleDC(pDC);
// Step 2:创建位图：CreateCompatibleBitmap()
bm.CreateCompatibleBitmap(pDC,rc.Width(),rc.Height());
// Step 3:把位图选入设备环境：SelectObject()，可以理解为选择画布
dcMem.SelectObject(&bm);
dcMem.SelectObject(Pen);
dcMem.SelectObject(Brush);
dcMem.Ellipse(0,0,50,50);//画椭圆
// Step 4:把绘制好的图形“拷贝“到屏幕上:BitBlt()
pDC->BitBlt(0,0,rc.Width(),rc.Height(),&dcMem,0,0,SRCCOPY);
dcMem.DeleteDC();
bm.DeleteObject();
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