自己做UDP练习时写的，仅一个发送按钮和一个接收监听线程，消息是自己发给自己，IP内容端口都写死了，是在VS2003下写的-UDP myself when writing exercises, only to receive a send button, and a listener thread, the message is issued to their own, IP content port are written to die is written in VS2003 under