说明：  本代码为用VS2003中开发基于Pocket PC设备串口通信而设计的一个单独的类。 考虑到系统运行稳定，在此类中将“打开”和“关闭”串口事件设成私有方法， 同时为了使用方便，对外提供一系列公共属性来在程序运行中实时设置， 其中包括布尔型串口打开事件，以及“发送”与“接收”两个公共方法。
(the code developed using VS2003 based Pocket PC serial communication equipment designed a separate category. Taking into account the stability of system operation, such references to the "open" and "closed" serial port into an incident private, also for the convenience of users, providing a series of public external attributes to the procedure set up real-time operations, including Boolean-type serial port opened, and "send" and "receive" two public methods.)