Spy本来是vc中的一个窗口推测工具。在学VC时，界面是很重要的一部分内容。通过自己做一个Spy可以深刻了解windows窗口应用程序的特性。-Spy was originally vc speculation tool in a window. VC in school, the interface is a very important part of the content. Make a Spy through their windows can be a deep understand