• C#中的socket编程UDP


    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Net;
    using System.Net.Sockets;

    namespace UDPServer
    {
        class Program
        {
            static void Main(string[] args)
            {
                int recv;
                byte[] data = new byte[1024];

                //构建TCP 服务器

                //得到本机IP,设置TCP端口号         
                IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 8001);
                Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

                //绑定网络地址
                newsock.Bind(ipep);

                Console.WriteLine("This is a Server, host name is {0}", Dns.GetHostName());

                //等待客户机连接
                Console.WriteLine("Waiting for a client");

                //得到客户机IP
                IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
                EndPoint Remote = (EndPoint)(sender);
                recv = newsock.ReceiveFrom(data, ref Remote);
                Console.WriteLine("Message received from {0}: ", Remote.ToString());
                Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));

                //客户机连接成功后,发送欢迎信息
                string welcome = "Welcome ! ";

                //字符串与字节数组相互转换
                data = Encoding.ASCII.GetBytes(welcome);

                //发送信息
                newsock.SendTo(data, data.Length, SocketFlags.None, Remote);
                while (true)
                {
                    data = new byte[1024];
                    //发送接受信息
                    recv = newsock.ReceiveFrom(data, ref Remote);
                    Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
                    newsock.SendTo(data, recv, SocketFlags.None, Remote);
                }
            }
            static void Send(string[] args)
            {
                byte[] data = new byte[1024];
                string input, stringData;

                //构建TCP 服务器

                Console.WriteLine("This is a Client, host name is {0}", Dns.GetHostName());

                //设置服务IP,设置TCP端口号
                IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8001);

                //定义网络类型,数据连接类型和网络协议UDP
                Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

                string welcome = "Hello! ";
                data = Encoding.ASCII.GetBytes(welcome);
                server.SendTo(data, data.Length, SocketFlags.None, ipep);
                IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
                EndPoint Remote = (EndPoint)sender;

                data = new byte[1024];
                //对于不存在的IP地址,加入此行代码后,可以在指定时间内解除阻塞模式限制
                //server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 100);
                int recv = server.ReceiveFrom(data, ref Remote);
                Console.WriteLine("Message received from {0}: ", Remote.ToString());
                Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
                while (true)
                {
                    input = Console.ReadLine();
                    if (input == "exit")
                        break;
                    server.SendTo(Encoding.ASCII.GetBytes(input), Remote);
                    data = new byte[1024];
                    recv = server.ReceiveFrom(data, ref Remote);
                    stringData = Encoding.ASCII.GetString(data, 0, recv);
                    Console.WriteLine(stringData);
                }
                Console.WriteLine("Stopping Client.");
                server.Close();
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/bayonetxxx/p/1459301.html
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