This article analyzes three methods of realizing serial communication program automation, including software polling, communication event and multithread in details.
详细分析了实现串行通讯程序自动化的三种方法：软件查询、通讯事件和多线程。
For example, polling, billing, and logger functions must be invoked before the actual program begins.
例如投票、支付和登录函数必须在实际种程序启动前运行。
This can be useful when polling a serial port for data, as your program can determine the number of bytes in the input buffer before attempting a read.
在查询串口是否有数据到来的时候这一段是很有用的，可以让程序在准备读取之前用来确定输入缓冲区里面的可读字节数。
This can be useful when polling a serial port for data, as your program can determine the number of bytes in the input buffer before attempting a read.
在查询串口是否有数据到来的时候这一段是很有用的，可以让程序在准备读取之前用来确定输入缓冲区里面的可读字节数。
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