一个实现不规则形状窗体的例子。该例子除了创建vc提供的一些圆角矩形、椭圆、多边形之外，还介绍了如何实现自定义形状的窗口，比如字体窗口。-The example is a realization of irregular shape s Window. In addition to providing the example to create a number of vc rounded rectangle, ellipse, polygon, it also explains how to c