Spcomm控件测试，Spcomm应用的核心在于主线程、读线程和写线程之间的消息传递机制，而通信数据相关信息的传递也是以消息传递的方式进行的-Spcomm Control Test, Spcomm application lies in the main thread, read thread and write the message passing between threads, and communications data related to the transfer of info