通过一个简单MFC程序例子，介绍MFC程序的运行机制和开发过程, 如事件驱动，数据交换(DoDataExchange)等,适合MFC编程入门。-By a simple example to introduce the operation mechanism and development process of MFC program, such as event-driven, DoDataExchange and so on, suitable for a new MFC programm