无连接通信是通过“用户数据报协议”（User Dadagram Protocol，UDP）来完成的。它不保障可靠数据的传输，但能够向若干个目标发送数据，接收来自若干个源的数据。本例程是一个UDP示例程序。使用UDP异步通讯，并利用事件机制判断数据的接收。-Connectionless communication is through the " User Datagram Protocol"　(User Dadagram Protocol, UDP) to complete. It does not guarantee reliable data transmission, but a number of goals to send data to, receive data from several sources. UDP is an example of this routine procedure. Asynchronous communication using UDP, and use the event mechanism to determine the data reception.