4.1 步骤3加入菜单消息处理函数 Class name Objects IDs Messages CMenuTest view ID DRAW REct COMmaND 2. CMenuTest view ID DRAW CIRCLE COMMAND void CMenu TestView: OnDrawRecto void CMenu TestView On Circle CClientDC dc(this CClientDc dc(this) dc Rectangle (50, 50, 200, 150) dc Ellipse(250,50,400,150)步骤3 加入菜单消息处理函数 Class Name Objects IDs Messages 1. CMenuTestView ID_DRAW_RECT COMMAND 2. CMenuTestView ID_DRAW_ CIRCLE COMMAND 4.1 void CMenuTestView::OnDrawRect() { CClientDC dc(this); dc.Rectangle(50,50,200,150); } void CMenuTestView::OnDrawCircle() { CClientDC dc(this); dc.Ellipse(250,50,400,150); }