How to use websocket to realize simple chat function in C ＃

C# How to use it websocket Realize simple chat function

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Preface

• Use C# Language development , be based on .NET FrameWork4

• The function includes group chat , Talk privately with

Interface

Interface design code

namespace chat_server
{
    partial class Form1
    {
        /// <summary>
        ///  Required designer variables .
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        ///  Clean up all the resources in use .
        /// </summary>
        /// <param name="disposing"> If managed resources should be released , by  true; Otherwise  false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows  Form designer generated code 

        /// <summary>
        ///  The designer supports the required methods  -  Do not modify 
        ///  Use the code editor to modify the contents of this method .
        /// </summary>
        private void InitializeComponent()
        {
            this.textBoxIP = new System.Windows.Forms.TextBox();
            this.labelIP = new System.Windows.Forms.Label();
            this.labelPort = new System.Windows.Forms.Label();
            this.textBoxPort = new System.Windows.Forms.TextBox();
            this.buttonStart = new System.Windows.Forms.Button();
            this.textBoxLog = new System.Windows.Forms.TextBox();
            this.textBoxMsg = new System.Windows.Forms.TextBox();
            this.buttonSend = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // textBoxIP
            // 
            this.textBoxIP.Location = new System.Drawing.Point(145, 25);
            this.textBoxIP.Name = "textBoxIP";
            this.textBoxIP.Size = new System.Drawing.Size(100, 25);
            this.textBoxIP.TabIndex = 0;
            this.textBoxIP.Text = "127.0.0.1";
            // 
            // labelIP
            // 
            this.labelIP.AutoSize = true;
            this.labelIP.Location = new System.Drawing.Point(90, 28);
            this.labelIP.Name = "labelIP";
            this.labelIP.Size = new System.Drawing.Size(31, 15);
            this.labelIP.TabIndex = 1;
            this.labelIP.Text = "IP:";
            // 
            // labelPort
            // 
            this.labelPort.AutoSize = true;
            this.labelPort.Location = new System.Drawing.Point(371, 28);
            this.labelPort.Name = "labelPort";
            this.labelPort.Size = new System.Drawing.Size(54, 15);
            this.labelPort.TabIndex = 3;
            this.labelPort.Text = "port：";
            // 
            // textBoxPort
            // 
            this.textBoxPort.Location = new System.Drawing.Point(452, 25);
            this.textBoxPort.Name = "textBoxPort";
            this.textBoxPort.Size = new System.Drawing.Size(100, 25);
            this.textBoxPort.TabIndex = 2;
            this.textBoxPort.Text = "6666";
            // 
            // buttonStart
            // 
            this.buttonStart.Location = new System.Drawing.Point(718, 13);
            this.buttonStart.Name = "buttonStart";
            this.buttonStart.Size = new System.Drawing.Size(142, 45);
            this.buttonStart.TabIndex = 4;
            this.buttonStart.Text = " Opening service ";
            this.buttonStart.UseVisualStyleBackColor = true;
            this.buttonStart.Click += new System.EventHandler(this.buttonStart_Click);
            // 
            // textBoxLog
            // 
            this.textBoxLog.Location = new System.Drawing.Point(28, 73);
            this.textBoxLog.Multiline = true;
            this.textBoxLog.Name = "textBoxLog";
            this.textBoxLog.Size = new System.Drawing.Size(832, 406);
            this.textBoxLog.TabIndex = 5;
            // 
            // textBoxMsg
            // 
            this.textBoxMsg.Location = new System.Drawing.Point(28, 499);
            this.textBoxMsg.Name = "textBoxMsg";
            this.textBoxMsg.Size = new System.Drawing.Size(653, 25);
            this.textBoxMsg.TabIndex = 6;
            // 
            // buttonSend
            // 
            this.buttonSend.Location = new System.Drawing.Point(761, 499);
            this.buttonSend.Name = "buttonSend";
            this.buttonSend.Size = new System.Drawing.Size(99, 43);
            this.buttonSend.TabIndex = 7;
            this.buttonSend.Text = " send out ";
            this.buttonSend.UseVisualStyleBackColor = true;
            this.buttonSend.Click += new System.EventHandler(this.buttonSend_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(947, 567);
            this.Controls.Add(this.buttonSend);
            this.Controls.Add(this.textBoxMsg);
            this.Controls.Add(this.textBoxLog);
            this.Controls.Add(this.buttonStart);
            this.Controls.Add(this.labelPort);
            this.Controls.Add(this.textBoxPort);
            this.Controls.Add(this.labelIP);
            this.Controls.Add(this.textBoxIP);
            this.Name = "Form1";
            this.Text = " The server ";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.TextBox textBoxIP;
        private System.Windows.Forms.Label labelIP;
        private System.Windows.Forms.Label labelPort;
        private System.Windows.Forms.TextBox textBoxPort;
        private System.Windows.Forms.Button buttonStart;
        private System.Windows.Forms.TextBox textBoxLog;
        private System.Windows.Forms.TextBox textBoxMsg;
        private System.Windows.Forms.Button buttonSend;
    }
}

Source 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 chat_server
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

       
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        // socket Connect the container 
        Dictionary<Socket, String> userContain = new Dictionary<Socket, string>();
        

        private void buttonStart_Click(object sender, EventArgs e)
        {
            try
            {
                //1、 establish socket
                Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                //2、 binding ip And port 
                String ip = textBoxIP.Text;
                int port = Convert.ToInt32(textBoxPort.Text);
                socket.Bind(new IPEndPoint(IPAddress.Parse(ip), port));
                //3、 Turn on monitoring 
                socket.Listen(10);// The maximum value of waiting for connection queue 
                //4、 Start accepting client links 
                ThreadPool.QueueUserWorkItem(new WaitCallback(connect), socket);
            }
            catch
            {
                MessageBox.Show(" Failed to start the server ");
            }

        }
        
        private void connect(object socket)
        {
            var serverSockert = socket as Socket;// Coercive transformation 
            showLog(" The server starts normally , Start accepting data from the client ");
            byte[] data = new byte[1024];
            int len;
            String name; // The user name of the client 
            while (true)
            {
                try
                {
                    var proxSocket = serverSockert.Accept();// Accept the connection 
                    len = proxSocket.Receive(data, 0, data.Length, SocketFlags.None);// Accept the user name of the client 
                    name = Encoding.Default.GetString(data, 0, len);
                    showLog(String.Format(" client  {0}  user name  {1}  Connect to server ", proxSocket.RemoteEndPoint.ToString(),name));
                    String msg = String.Format(" user {0} launched ", name);
                    sendMsg(msg);
                    userContain[proxSocket] = name;// Put the object into the collection 
                    // Constantly accept the messages sent by the currently linked client 
                    ThreadPool.QueueUserWorkItem(new WaitCallback(this.recevie), proxSocket);
                }
                catch
                {
                    MessageBox.Show(" Accept exceptions ");
                    break;
                }
            }
        }

        private void recevie(object socket)
        {
            var proxSocket = socket as Socket;
            byte[] data = new byte[1024 * 1024];// Accept , Send data buffer 
            String msg;
            int len = 0; //  Data length 
            String name = userContain[proxSocket]; //  Client name 
            while (true)
            {
                try
                {
                    len = proxSocket.Receive(data, 0, data.Length, SocketFlags.None);
                }
                catch
                {
                    msg = String.Format(" client {0} Abnormal exit ",
                    proxSocket.RemoteEndPoint.ToString());
                    showLog(msg);
                    msg = String.Format(" user {0} Get offline ", name);
                    sendMsg(msg);
                    userContain.Remove(proxSocket);
                    stopConnect(proxSocket);
                    return;
                }
          
                if (len <= 0)
                {
                    // The client exits normally 
                    msg = String.Format(" client {0} The normal exit ",
                    proxSocket.RemoteEndPoint.ToString());
                    showLog(msg);
                    msg = String.Format(" user {0} Get offline ", name);
                    sendMsg(msg);
                    userContain.Remove(proxSocket);
                    stopConnect(proxSocket);
                    return;// End the asynchronous thread that currently accepts client data 
                }
                // Receive a message 
                msg = Encoding.Default.GetString(data, 0, len);
                // Format of private chat information @name:msg
                //name  Username  msg  For message 
                bool flag = true;
                if (msg.StartsWith("@"))
                {
                    int index = msg.IndexOf(":");
                    String targetName = msg.Substring(1, index-1);
                    msg = msg.Substring(index + 1);
                    foreach(var user in userContain)
                    {
                        if(targetName.Equals(user.Value)&&user.Key.Connected)
                        {
                            msg = String.Format(" user {0}  To you alone ：{1}",name,msg);
                            data = Encoding.Default.GetBytes(msg);
                            user.Key.Send(data, 0, data.Length, SocketFlags.None);
                            flag = false;
                            break;
                        }
                    }
                }
                if (flag)
                {
                    msg = String.Format(" user {0}：{1}", name, msg);
                    sendMsg(msg);
                }
            }
        }

        private void stopConnect(Socket socket)
        {
            try
            {
                if (socket.Connected)
                {
                    socket.Shutdown(SocketShutdown.Both);
                    socket.Close(100);
                }
            }
            catch
            {

            }
        }

        private void showLog(String msg)
        {
            if (textBoxLog.InvokeRequired)
            {
                // If it is cross thread access 
                textBoxLog.Invoke(new Action<String>(
                   s => {
                       this.textBoxLog.Text += msg+"\r\n"; 
                   }),msg);
            }
            else
            {
                this.textBoxLog.Text += msg;
            }
        }

        private void buttonSend_Click(object sender, EventArgs e)
        {
            // Send a message 
            String msg = String.Format(" The server issues notification information {0}", textBoxMsg.Text);
            sendMsg(msg);
        }

        private void sendMsg(String msg)
        {
            byte[] data = new byte[1024 * 1024];
            data = Encoding.Default.GetBytes(msg);
            foreach (var user in userContain)
            {
                if (user.Key.Connected)
                {
                     user.Key.Send(data, 0, data.Length, SocketFlags.None);
                }
            }
        }
    }
}

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