这个类可以插入到任何一个程序当中，它提供一个统一的接口，接口函数接收图象的资源索引号、长、宽3个参数。当然，你也可以加上一个父窗口的指针参数，用来决定该类对象Create行为，便于指定该图象代表的窗口应该依附在哪个父窗口之上。

编写这个类需要熟悉对CRgn类的运用。如成员函数CombineRgn和SetWindowRgn，具体信息请查阅msdn。

那么好，下面我们来一步步创建这个类。

-This class can be inserted into any one of these procedures, it provides a unified interface, interface function to receive image resources index number, length, width 3 parameters. Of course, you can also add a parent window pointer parameter, used to determine the type of object Create behavior, to facilitate the designation of the representative images in which the window should be dependent on the parent window. The preparation of this type need to be familiar with the use of CRgn category. Member functions such as CombineRgn and SetWindowRgn, specific information please refer to msdn. Well, well, let' s step by step to create this category.