C#通讯编程（整理）TCP/UDP通讯

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 );

            }

        }

 

        }

    }







using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Net;

using System.Net.Sockets;

 

namespace UDPClient

{

    class Program

    {

        static void Main(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];

            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 ();            

        }

 

        }

    }

简单的UDP


try

                    {

                        Socket s = new Socket(AddressFamily.InterNetwork

, SocketType.Dgram, ProtocolType.Udp);  //向此网段发广播包

                          int UDPListenerPort = 8082;

                        IPAddress broadcast = IPAddress.Parse("192.168.0.255"); //此处根据IP及子网掩码改为相应的广播IP

                        string ts = "This is UPD string for sending";

                        byte[] sendbuf = Encoding.ASCII.GetBytes(ts);

                        IPEndPoint ep = new IPEndPoint(broadcast, UDPListenerPort);

                        s.SendTo(sendbuf, ep);

 

                    }

                    catch (Exception e)

                    {}

UdpClient listener;

            int UDPListenerPort = 8082;

            IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, UDPListenerPort);

 

            try

            {

                while (true)

                {

                    byte[] bytes = listener.Receive(ref groupEP);

                    string RecIP = groupEP.ToString()

.Substring(0, groupEP.ToString().IndexOf(":"));  //收到发送UPD端的IP

                    string RecStr = Encoding.ASCII.GetString(bytes, 0, bytes.Length);   //收到的UPD字符串

                }

            }

            catch

            {}