socket socket讲解

socket  socket讲解

一.socket是何物？

参考百度百科：

http://baike.baidu.com/link?url=4YNURsJLEaL0II79C68gPUoYKliXWJLM8V6H5QL0r_QOEmrxSQsnFPYxeuBx1U1bukTcAxhcl1glTOjxiGZBgSqb5G9_4N9Dj-XX-jXtXba

二.socket常用类及函数讲解：(为如下demo做准备)

IPAddress：

IPAddress.Parse();

IPEndPoint:

Encoding：

Encoding.Unicode.GetString()
Encoding.Unicode.GetBytes()

Socket：

Send、Receive、Accept；

Thread:

 Thread.Sleep();

三.Demo:（仅供参考）

1.Client  code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace ClientSocket_Demo
{
    public partial class Client : Form
    {
        public Client()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false;
        }

        private Socket connSocket;
        private Thread ReceiveThread;

        private void btnConnection_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txtIp.Text))
            {
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "ip is null");
                return;
            }
            if (string.IsNullOrEmpty(txtPort.Text))
            {
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "port is null");
                return;
            }
            Connection();
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txtMsg.Text))
            {
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "msg is null");
                return;
            }
            SendMsg();
        }

        /// <summary>
        /// connection
        /// </summary>
        private void Connection()
        {
            IPAddress ip = IPAddress.Parse(txtIp.Text);
            IPEndPoint endPoint = new IPEndPoint(ip, int.Parse(txtPort.Text));
            connSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            try
            {
                connSocket.Connect(endPoint);
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "connection success.");
                btnConnection.Enabled = false;

            }
            catch (Exception ex)
            {
                connSocket.Close();
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "connection fail.");
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + ex.ToString());
            }

            ReceiveThread = new Thread(ReceiveCallBack);
            ReceiveThread.Start();
            ReceiveThread.IsBackground = true;
        }

        /// <summary>
        /// send msg
        /// </summary>
        private void SendMsg()
        {
            byte[] buffer = new byte[1024];
            string msg = txtMsg.Text;
            lstLog.Items.Add(DateTime.Now.ToString() + ":" + msg);
            buffer = Encoding.Unicode.GetBytes(msg);

            if (connSocket != null)
            {
                connSocket.Send(buffer);
            }
            else 
            {
                connSocket.Close();
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "send fail.");
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "no connection!");
            }
        }

        /// <summary>
        /// receive
        /// </summary>
        private void ReceiveCallBack()
        {
            byte[] buffer = new byte[1024];
            int count = 0;

            while (true)
            {
                Thread.Sleep(1000);
                try
                {
                    count = connSocket.Receive(buffer);
                    if (count == 0)
                    {
                        connSocket.Close();
                        lstLog.Items.Add(DateTime.Now.ToString() + ":server disconnect.");
                        break;
                    }
                    string msg = Encoding.Unicode.GetString(buffer,0, count);
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + msg);
                }
                catch (Exception ex)
                {
                    connSocket.Close();
                    lstLog.Items.Add(DateTime.Now.ToString() + ":server disconnect.");
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + ex.ToString());
                    break;
                }
            }
        }
    }
}

2.Server code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace Socket_Demo
{
    public partial class Server : Form
    {
        public Server()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false;
        }

        private Socket connSocket;
        private Thread listenThread;
        private Thread ReceiveThread;

        private void button1_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txtIp.Text))
            {
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "ip is null");
                return;
            }
            if (string.IsNullOrEmpty(txtPort.Text))
            {
                lstLog.Items.Add(DateTime.Now.ToString() + ":" + "port is null");
                return;
            }
            Start();
        }

        /// <summary>
        /// start
        /// </summary>
        private void Start()
        {
            byte[] buffer = new byte[1024];
            IPAddress ip = IPAddress.Parse(txtIp.Text);
            IPEndPoint endPoint = new IPEndPoint(ip, int.Parse(txtPort.Text));
            connSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            connSocket.Bind(endPoint);
            connSocket.Listen(10);
            lstLog.Items.Add(DateTime.Now.ToString() + ":" + "listen:" + txtPort.Text);
            button1.Enabled = false;

            //监听线程
            listenThread = new Thread(ListenCallBack);
            listenThread.Start(connSocket);
            listenThread.IsBackground = true;
        }

        /// <summary>
        /// listen
        /// </summary>
        /// <param name="o"></param>
        private void ListenCallBack(object obj)
        {
            string ip = string.Empty;

            //创建监听套接字
            Socket listenSocket = obj as Socket;

            while (true)
            {
                Thread.Sleep(1000);

                try
                {
                    //创建通信套接字
                    Socket socket = listenSocket.Accept();
                    ip = socket.RemoteEndPoint.ToString();
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + ip + " connect success.");

                    //通信线程
                    ReceiveThread = new Thread(ReceiveCallBack);
                    ReceiveThread.Start(socket);
                    ReceiveThread.IsBackground = true;
                }
                catch (Exception ex)
                {
                    listenSocket.Close();
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + ex.ToString());
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + ip + " connect fail.");
                    break;
                }
            }
        }

        /// <summary>
        /// receive
        /// </summary>
        /// <param name="o"></param>
        private void ReceiveCallBack(object o)
        {
            byte[] buffer = new byte[1024];
            int count = 0;
            string ip = string.Empty;

            Socket ReceiveSocket = o as Socket;

            while (true)
            {
                Thread.Sleep(1000);
                try
                {
                    ip = ReceiveSocket.RemoteEndPoint.ToString();
                    count = ReceiveSocket.Receive(buffer);
                    if (count == 0)
                    {
                        ReceiveSocket.Close();
                        lstLog.Items.Add(DateTime.Now.ToString() + ":client disconnect.");
                        break;
                    }
                    string msg = Encoding.Unicode.GetString(buffer, 0, count);
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + msg);
                }
                catch (Exception ex)
                {
                    ReceiveSocket.Close();
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + ip + "client disconnect.");
                    lstLog.Items.Add(DateTime.Now.ToString() + ":" + ex.ToString());
                    break;
                }
            }
        }

        private void Server_Load(object sender, EventArgs e)
        {
            var localhostIp = Dns.GetHostEntry(Dns.GetHostName()).AddressList[5];
            txtIp.Text = localhostIp.ToString();
            txtPort.Text = "8000";
        }
    }
}

四.注意事项：