socket通讯

/*
  服务端代码
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

//额外导入的两个命名空间
using System.Net.Sockets;
using System.Net;

namespace SocketServer
{
    class Program
    {
        /// <summary>
        /// Socket Server 演示
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            //创建一个新的Socket,这里我们使用最常用的基于TCP的Stream Socket（流式套接字）
            var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            //将该socket绑定到主机上面的某个端口
            //方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.bind.aspx
            socket.Bind(new IPEndPoint(IPAddress.Any, 4530));

            //启动监听，并且设置一个最大的队列长度
            //方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.listen(v=VS.100).aspx
            socket.Listen(4);

            //开始接受客户端连接请求
            //方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginaccept.aspx
            socket.BeginAccept(new AsyncCallback(ClientAccepted), socket);


            Console.WriteLine("Server is ready!");
            Console.Read();
        }


        public static void ClientAccepted(IAsyncResult ar)
        {

            var socket = ar.AsyncState as Socket;

            //这就是客户端的Socket实例，我们后续可以将其保存起来
            var client = socket.EndAccept(ar);

            //给客户端发送一个欢迎消息
            client.Send(Encoding.Unicode.GetBytes("Hi there, I accept you request at " + DateTime.Now.ToString()));


            //实现每隔两秒钟给服务器发一个消息
            //这里我们使用了一个定时器
            var timer = new System.Timers.Timer();
            timer.Interval = 2000D;
            timer.Enabled = true;
            timer.Elapsed += (o, a) =>
            {
                //检测客户端Socket的状态
                if(client.Connected)
                {
                    try
                    {
                        client.Send(Encoding.Unicode.GetBytes("Message from server at " + DateTime.Now.ToString()));
                    }
                    catch(SocketException ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                }
                else
                {
                    timer.Stop();
                    timer.Enabled = false;
                    Console.WriteLine("Client is disconnected, the timer is stop.");
                }
            };
            timer.Start();


            //接收客户端的消息(这个和在客户端实现的方式是一样的）
            client.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveMessage), client);

            //准备接受下一个客户端请求
            socket.BeginAccept(new AsyncCallback(ClientAccepted), socket);
        }

        static byte[] buffer = new byte[1024];

        public static void ReceiveMessage(IAsyncResult ar)
        {

            try
            {
                var socket = ar.AsyncState as Socket;

                //方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx
                var length = socket.EndReceive(ar);
                //读取出来消息内容
                var message = Encoding.Unicode.GetString(buffer, 0, length);
                //显示消息
                Console.WriteLine(message);

                //接收下一个消息(因为这是一个递归的调用，所以这样就可以一直接收消息了）
                socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveMessage), socket);
            }
            catch(Exception ex){
                Console.WriteLine(ex.Message);
            }
        }
    }
}

/*

客户端代码

*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

//导入的命名空间
using System.Net.Sockets;

namespace SocketClient
{
    class Program
    {
        /// <summary>
        /// Socket Server 演示
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            //创建一个Socket
            var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            //连接到指定服务器的指定端口
            //方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.connect.aspx
            socket.Connect("localhost", 4530);

            Console.WriteLine("connect to the server");
            //实现接受消息的方法

            //方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.beginreceive.aspx
            socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveMessage), socket);

            //接受用户输入，将消息发送给服务器端
            while(true)
            {
                var message = "Message from client : " + Console.ReadLine();
                var outputBuffer = Encoding.Unicode.GetBytes(message);
                socket.BeginSend(outputBuffer, 0, outputBuffer.Length, SocketFlags.None, null, null);
            }

        }


        static byte[] buffer = new byte[1024];

        public static void ReceiveMessage(IAsyncResult ar)
        {
            try
            {
                var socket = ar.AsyncState as Socket;

                //方法参考：http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socket.endreceive.aspx
                var length = socket.EndReceive(ar);
                //读取出来消息内容
                var message = Encoding.Unicode.GetString(buffer, 0, length);
                //显示消息
                Console.WriteLine(message);

                //接收下一个消息(因为这是一个递归的调用，所以这样就可以一直接收消息了）
                socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveMessage), socket);
            }
            catch(Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

　　

/*

文章摘自

https://www.cnblogs.com/chenxizhang/archive/2011/09/10/2172994.html

*/