一个简易的聊天程序（Socket）

效果图：

服务端Server代码：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.IO;using System.Linq;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading;using System.Threading.Tasks;using System.Windows.Forms;namespace Socket网络编程_Server{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void btnStart_Click(object sender, EventArgs e)        {            try            {                //当点击开始监听的时候 在服务器端创建一个负责监IP地址跟端口号的Socket                Socket socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);                IPAddress ip = IPAddress.Any;                //创建端口号对象                IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));                //监听                socketWatch.Bind(point);                ShowMsg("监听成功");                socketWatch.Listen(10);                Thread th = new Thread(Listen);                th.IsBackground = true;                th.Start(socketWatch);            }            catch             { }                    }        /// <summary>        /// 等待客户端的连接 并且创建与之通信用的Socket        /// </summary>        Socket socketSend;        void Listen(Object o)//线程所执行的函数，如果有参数，必须是Object类型        {            Socket socketWatch = o as Socket;            //等待客户端的连接 并且创建一个负责通信的Socket            while (true)            {                try                {                    //负责跟客户端通信的Socket                    socketSend = socketWatch.Accept();                    //将远程连接的客户端的IP地址和Socket存入集合中                    dicSocket.Add(socketSend.RemoteEndPoint.ToString(),socketSend);                    //将远程连接的客户端的IP地址和Socket存入到下拉框中                    cboUsers.Items.Add(socketSend.RemoteEndPoint.ToString());                    //192.168.11.87：连接成功                    ShowMsg(socketSend.RemoteEndPoint.ToString() + "：连接成功");                    //开启一个新线程，不停的接收客户端发来的消息                    Thread th = new Thread(Recive);                    th.IsBackground = true;                    th.Start(socketSend);                }                catch                { }                            }        }        //将远程连接的客户端的IP地址和Socket存入集合中        Dictionary<string, Socket> dicSocket = new Dictionary<string, Socket>();        /// <summary>        /// 服务器端不停的接收客户端发来的消息        /// </summary>        /// <param name="o"></param>        void Recive(Object o)        {            Socket socketSend = o as Socket;            while (true)            {                try                {                    //客户端连接成功后，服务器应该接受客户端发来的信息                    byte[] buffer = new byte[1024 * 1024 * 2];                    //实际接收到的有效字节数                    int r = socketSend.Receive(buffer);                    if (r == 0)                    {                        break;                    }                    string str = Encoding.UTF8.GetString(buffer, 0, r);                    ShowMsg(socketSend.RemoteEndPoint + ":" + str);                }                catch                 { }            }        }        void ShowMsg(string str)        {            txtLog.AppendText(str + "\r\n");        }        private void Form1_Load(object sender, EventArgs e)        {            Control.CheckForIllegalCrossThreadCalls = false;        }        /// <summary>        /// 服务器给客户端发送消息        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btnSend_Click(object sender, EventArgs e)        {            try            {                string str = txtMsg.Text;                byte[] buffer = Encoding.UTF8.GetBytes(str);                List<byte> list = new List<byte>();                list.Add(0);                list.AddRange(buffer);                //将泛型集合转换为集合                byte[] newBuffer = list.ToArray();                //获得用户在下拉框总选中的IP地址                string ip = cboUsers.SelectedItem.ToString();                dicSocket[ip].Send(newBuffer);                //socketSend.Send(buffer);            }            catch             {}                                }        /// <summary>        /// 选择要发送的文件        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btnSelect_Click(object sender, EventArgs e)        {            OpenFileDialog ofd = new OpenFileDialog();            ofd.Title = "请选择";            ofd.InitialDirectory = @"C:\Users\Administrator\Desktop";            ofd.Filter = "所有文件|*.*";            ofd.ShowDialog();            txtPath.Text = ofd.FileName;        }        private void btnSendFile_Click(object sender, EventArgs e)        {            //获得要发送文件的路径            string path = txtPath.Text;            using (FileStream fsRead=new FileStream(path,FileMode.Open,FileAccess.Read))            {                byte[] buffer = new byte[1024 * 1024 * 5];                int r = fsRead.Read(buffer, 0, buffer.Length);                List<byte> list = new List<byte>();                list.Add(1);                list.AddRange(buffer);                byte[] newBuffer = list.ToArray();                dicSocket[cboUsers.SelectedItem.ToString()].Send(newBuffer, 0, r+1, SocketFlags.None);            }        }        /// <summary>        /// 发送震动        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btnZD_Click(object sender, EventArgs e)        {            byte[] buffer = new byte[1];            buffer[0] = 2;            dicSocket[cboUsers.SelectedItem.ToString()].Send(buffer);        }    }}

客户端Client代码：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.IO;using System.Linq;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading;using System.Threading.Tasks;using System.Windows.Forms;namespace Socket网络编程_Client{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        Socket socketSend;        private void btnStart_Click(object sender, EventArgs e)        {            try            {                //创建负责通信的Socket    1:表示IP v4     2:什么类型的流,流氏的   3:对应的服务                socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);                //需要将文本框的IP地址转换成IPAddress类型                IPAddress ip = IPAddress.Parse(txtServer.Text);                //需要将端口号转换成IPEndPoint类型                  IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));                //获得要连接的远程服务器应用程序的IP地址和端口号                socketSend.Connect(point);                ShowMsg("连接成功");                //开启一个新的线程不停的接收服务器端发来的消息                Thread th = new Thread(Recive);                th.IsBackground = true;                th.Start();            }            catch { }        }        /// <summary>        /// 不停的接收服务器发来的消息        /// </summary>        void Recive()        {            while (true)            {                try                {                    byte[] buffer = new byte[1024 * 1024 * 3];                    //实际接收到的有效字节数                    int r = socketSend.Receive(buffer);                    if (r == 0)                    {                        break;                    }                    //先拿到第一位，判断发送的是否文字消息                    if (buffer[0] == 0)                    {                        //注意解码的时候要从第一个开始到长度-1个字节                        string s = Encoding.UTF8.GetString(buffer, 1, r-1);                        ShowMsg(socketSend.RemoteEndPoint + ":" + s);                    }                    if (buffer[0] == 1)                    {                        SaveFileDialog sfd = new SaveFileDialog();                        sfd.InitialDirectory = @"C:\Users\Administrator\Desktop";                        sfd.Title = "请选择要保存的文件";                        sfd.Filter = "所有文件|*.*";                        sfd.ShowDialog(this);//不加this弹不出？                        string path = sfd.FileName;                        using (FileStream fsWrite=new FileStream(path,FileMode.OpenOrCreate,FileAccess.Write))                        {                            fsWrite.Write(buffer,1,r-1);                        }                        MessageBox.Show("保存成功 ");                    }                    if (buffer[0] == 2)                    {                        ZD();                    }                }                catch { }            }        }        /// <summary>        /// 震动        /// </summary>        void ZD()        {            for (int i = 0; i < 500; i++)            {                this.Location = new Point(200, 200);                this.Location = new Point(280,280);             }        }        void ShowMsg(string str)        {            txtLog.AppendText(str + "\r\n");        }        /// <summary>        /// 客户端给服务器发送消息        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btnSend_Click(object sender, EventArgs e)        {            string str = txtMsg.Text.Trim();            byte[] buffer = Encoding.UTF8.GetBytes(str);            socketSend.Send(buffer);        }        private void Form1_Load(object sender, EventArgs e)        {            Control.CheckForIllegalCrossThreadCalls = false;        }    }}