C# Socket编程

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服务端（server side）

sing System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading.Tasks;namespace MyChatServer{       internal class server    {        [STAThread]        private static void Main(string[] args)        {            int recv;            byte[] data = new byte[1024];            IPEndPoint ipEnd = new IPEndPoint(IPAddress.Any, 9050);            Socket newSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            newSocket.Bind(ipEnd);            newSocket.Listen(10);            Console.WriteLine("Waiting for a client...");            Socket client = newSocket.Accept();            IPEndPoint clientIp = client.RemoteEndPoint as IPEndPoint;            Console.WriteLine("connect with client: " + clientIp.Address + " at port; " + clientIp.Port);            string welcome = "welcome here";            data = Encoding.ASCII.GetBytes(welcome);            client.Send(data, data.Length, SocketFlags.None);            while (true)            {                data = new byte[1024];                recv = client.Receive(data);                Console.WriteLine("recv = " + recv);                if (recv == 0)                {                    break;                }                                Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));                client.Send(data, recv, SocketFlags.None);            }            Console.WriteLine("Disconnected from " + clientIp.Address);            client.Close();            newSocket.Close();        }    }}

客户端（Client Side）

using System;using System.Net;using System.Net.Sockets;using System.Text;namespace tcpclient{    /// <summary>    /// Class1 的摘要说明。    /// </summary>    class client    {        /// <summary>        /// 应用程序的主入口点。        /// </summary>        [STAThread]        static void Main(string[] args)        {            //            // TODO: 在此处添加代码以启动应用程序            //            byte[] data=new byte[1024];            Socket newclient=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);            Console.Write("please input the server ip:");            string ipadd=Console.ReadLine();            Console.WriteLine();            Console.Write("please input the server port:");            int port=Convert.ToInt32(Console.ReadLine());            IPEndPoint ie=new IPEndPoint(IPAddress.Parse(ipadd),port);//服务器的IP和端口            try            {                //因为客户端只是用来向特定的服务器发送信息，所以不需要绑定本机的IP和端口。不需要监听。                newclient.Connect(ie);            }            catch(SocketException e)            {                Console.WriteLine("unable to connect to server");                Console.WriteLine(e.ToString());                return;            }            int recv = newclient.Receive(data);            string stringdata=Encoding.ASCII.GetString(data,0,recv);            Console.WriteLine(stringdata);            while(true)            {                string input=Console.ReadLine();                if(input=="exit")                    break;                newclient.Send(Encoding.ASCII.GetBytes(input));                data=new byte[1024];                recv=newclient.Receive(data);                stringdata=Encoding.ASCII.GetString(data,0,recv);                Console.WriteLine(stringdata);            }            Console.WriteLine("disconnect from sercer");            newclient.Shutdown(SocketShutdown.Both);            newclient.Close();        }    }}

如果要在Unity中在web platform使用Socket编程（Window平台），需要做以下操作：

1、首先找到sockpol.exe文件。文件路径..\Unity\Editor\Data\Tools\SocketPolicyServer\sockpol.exe

2、然后打开cmd控制台，并且进入到sockpol.exe目录，打开sockpol服务，服务不能关闭。在cmd中使用netstat -ano命令可以看到一个843端口的服务。

3、在客户端连接（Unity中）的开始部分，加上下面这句代码。

Security.PrefetchSocketPolicy(ipAddress, 843); //端口号843固定，ipAddress为服务器的ip

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