C#的socket:tcp/udp/unix

红太狼 2021-09-21 13:24 341阅读 0赞

# ![cd08eb284e4db054e9f27a6eb7248a39.gif][] #

MS还为我们提供了几个助手类：TcpClient类、TcpListener类、UDPClient类。这几个类简化了一些操作

以下是原生c\#的原生socket编写上述服务

# tcp\_socket #

server

using System;
    using System.Net;
    using System.Net.Sockets;
    using System.Text;
    
    namespace tcpserver
    {
        /// <summary>
        /// Class1 的摘要说明。
        /// </summary>
        class server
        {
            /// <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
                //
                int recv;//用于表示客户端发送的信息长度
                byte[] data=new byte[1024];//用于缓存客户端所发送的信息,通过socket传递的信息必须为字节数组
                IPEndPoint ipep=new IPEndPoint(IPAddress.Any,9050);//本机预使用的IP和端口
                Socket newsock=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
                newsock.Bind(ipep);//绑定
                newsock.Listen(10);//监听
                Console.WriteLine("waiting for a client");
                Socket client=newsock.Accept();//当有可用的客户端连接尝试时执行，并返回一个新的socket,用于与客户端之间的通信
                IPEndPoint clientip=(IPEndPoint)client.RemoteEndPoint;
                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);//发送信息
                while(true)
                {//用死循环来不断的从客户端获取信息
                    data=new byte[1024];
                    recv=client.Receive(data);
                    Console.WriteLine("recv="+recv);
                    if (recv==0)//当信息长度为0，说明客户端连接断开
                        break;
                    Console.WriteLine(Encoding.ASCII.GetString(data,0,recv));
                    client.Send(data,recv,SocketFlags.None);
                }
                Console.WriteLine("Disconnected from"+clientip.Address);
                client.Close();
                newsock.Close();
    
            }
        }
    }

client

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();
    
            }
        }
    }

# udp\_socket #

server

using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Net;
    using System.Net.Sockets;
    namespace SimpleUdpSrvr
    {
        class Program
        {
            static void Main(string[] args)
            {
                int recv;
                byte[] data = new byte[1024];
                IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 9050);//定义一网络端点
                Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//定义一个Socket
                newsock.Bind(ipep);//Socket与本地的一个终结点相关联
                Console.WriteLine("Waiting for a client..");
    
                IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);//定义要发送的计算机的地址
                EndPoint Remote = (EndPoint)(sender);//
                recv = newsock.ReceiveFrom(data, ref Remote);//接受数据           
                Console.WriteLine("Message received from{0}:", Remote.ToString());
                Console.WriteLine(Encoding.ASCII.GetBytes(data,0,recv));
    
                string welcome = "Welcome to my test server!";
                data = Encoding.ASCII.GetBytes(welcome);
                newsock.SendTo(data, data.Length, SocketFlags.None, Remote);
                while (true)
                {
                    data = new byte[1024];
                    recv = newsock.ReceiveFrom(data, ref Remote);
                    Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
                    newsock.SendTo(data, recv, SocketFlags.None, Remote);
                }
            }
        }
    }

client

using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Net;
    using System.Net.Sockets;
    namespace SimpleUdpClient
    {
        class Program
        {
            static void Main(string[] args)
            {
                byte[] data = new byte[1024];//定义一个数组用来做数据的缓冲区
                string input, stringData;
                IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050);
                Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
                string welcome = "Hello,are you there?";
                data = Encoding.ASCII.GetBytes(welcome);
                server.SendTo(data, data.Length, SocketFlags.None, ipep);//将数据发送到指定的终结点
    
                IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
                EndPoint Remote = (EndPoint)sender;
                data = new byte[1024];
                int recv = server.ReceiveFrom(data, ref Remote);//接受来自服务器的数据
    
                Console.WriteLine("Message received from{0}:", Remote.ToString());
                Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
                while (true)//读取数据
                {
                    input = Console.ReadLine();//从键盘读取数据
                    if (input == "text")//结束标记
                    {
                        break;
                    }
                    server.SendTo(Encoding.ASCII.GetBytes(input), Remote);//将数据发送到指定的终结点Remote
                    data = new byte[1024];
                    recv = server.ReceiveFrom(data, ref Remote);//从Remote接受数据
                    stringData = Encoding.ASCII.GetString(data, 0, recv);
                    Console.WriteLine(stringData);
                }
                Console.WriteLine("Stopping client");
                server.Close();
            }
        }
    }

# unix\_socket #

using System;
    using System.Net.Sockets;
    using System.Threading.Tasks;
    
    class Program
    {
        static void Main(string[] args)
        {
            var path = "/tmp/foo.sock";
    
            // client
            Task.Run(async () =>
            {
                // wait 2 seconds
                await Task.Delay(2000);
    
                using (var socket = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified))
                {
                    socket.Connect(new UnixDomainSocketEndPoint(path));
    
                    // send hello world
                    var dataToSend = System.Text.Encoding.UTF8.GetBytes("Hello-world!");
    
                    socket.Send(dataToSend);
                }
            });
    
            // Server
            {
                // delete file if it exists
                if (System.IO.File.Exists(path))
                    System.IO.File.Delete(path);
    
                var socket = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified);
                socket.Bind(new UnixDomainSocketEndPoint(path));
                socket.Listen(5);
                Console.WriteLine("Server started waiting for client to connect...");
    
                var s = socket.Accept();
    
                Console.WriteLine("Client connected");
    
                var buffer = new byte[1024];
                var numberOfBytesReceived = s.Receive(buffer, 0, buffer.Length, SocketFlags.None);
    
                var message = System.Text.Encoding.UTF8.GetString(buffer, 0, numberOfBytesReceived);
    
                Console.WriteLine($"Received: {message}");
            }
    
        }
    }

[cd08eb284e4db054e9f27a6eb7248a39.gif]: /images/20210920/b4cd9b662c3047d2a455df768556e89e.png