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CDC *pDC;
pDC=GetDC();
CPen GreenPen(PS_SOLID,1,RGB(0,255,0)),*pOldPen;
pOldPen=pDC->SelectObject(&GreenPen); //选择画笔
int x1,x2,y1,y2;
pDC->Arc(CRect(x1,y1,x2,y2),CPoint(x1,y1),CPoint(x1,y1));
pDC->SelectObject(pOldPen);
GreenPen.DeleteObject();
ReleaseDC(pDC);