MFC画图小程序。可以画直线、矩形、椭圆等；还可以输入字符并显示；实现了简单的保存功能，再次打开后可以见到保存前的图形；-MFC drawing applet. Can draw lines, rectangles, ellipses, etc. can also enter a character and display to achieve a simple save function, after re-opening to see the graphics before saving