说明：  MSComm控件使用详解 这篇东西来不及好好整理，因有朋友经常提及，先放在这里，如果有必要，再详细理顺一下，更为详细的信息请去看MSDN。
(Control the use of MSComm explain this a good time to organize things, because we have friends often mentioned first here, if necessary, and then straighten out some details, more detailed information, please see MSDN.)