在串口通讯程序中，对于收到的数据包，经常需要从中提取需要的数据，以及如何处理校验等，在这篇文章里举两个例子予以说明。此文也适于其它通讯程序中对数据报文的处理。
,In the serial communication program, received packets, often need to extract the needed data, as well as how to deal with parity and so on, in this article, give two examples to explain. This article is also suitable for other communications procedures for the handling of data packets.