说明：  该程序利用注册表进行软件注册，未注册受使用次数限制，是保护软件的基础，供初学Visual c++ MFC编程的人员下载学习。
(This program uses a registry for software registration. Unregistered software is limited by usage times and serves as the foundation for protecting the software. It is available for beginners in Visual c++MFC programming to download and learn.)