asp.net based on C # socket Chat program (one server, multiple clients)

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Using System.Net; Using System.Net.Sockets; Using System.Threading; Using System.IO;

MainForm.cs

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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; Using System.Net.Sockets; Using System.Threading; Using System.IO; Namespace Syncchatserver { public partial class Mainform:form { <summary> Save all users of a connection </summary> Private list<user> userlist = new list<user> (); <summary> Server IP Address </summary>; private string ServerIP; <summary> Listening port </summary> private int port; Private TcpListener MyListener; <summary> Whether to exit all incoming threads normally </summary> BOOL Isnormalexit = false; Public MainForm () { InitializeComponent (); Lst_state.horizontalscrollbar = true; btn_stop.enabled = false; Setserveripandport (); } &lt;summary&gt; Set IP and port based on the contents of the text file ' ServerIPAndPort.txt ' of the current program directory Format: 127.0.0.1:8885 &lt;/summary&gt; private void Setserveripandport () { FileStream fs = new FileStream ("ServerIPAndPort.txt", FileMode.Open); StreamReader sr = new StreamReader (FS); String ipandport = Sr. ReadLine (); ServerIP = Ipandport.split (': ') [0]; Set IP Port = Int. Parse (Ipandport.split (': ') [1]); Set port Sr. Close (); Fs. Close (); } &lt;summary&gt; Start listening. &lt;/summary&gt; &lt;param name= "Sender" &gt;&lt;/param&gt; &lt;param name= "E" &gt;&lt;/param&gt; private void Btn_start_click (object sender, EventArgs e) { MyListener = new TcpListener (Ipaddress.parse (ServerIP), port); Mylistener.start (); Additemtolistbox (String. Format ("Start monitoring client connections in {0}:{1}", ServerIP, Port)); Create a Thread Supervisor Client connection request Thread mythread = new Thread (listenclientconnect); Mythread.start (); btn_start.enabled = false; Btn_stop.enabled = true; } &lt;summary&gt; Receiving client connections &lt;/summary&gt; private void Listenclientconnect () { TcpClient newclient = null; while (true) { Try { Newclient = Mylistener.accepttcpclient (); } Catch { AcceptTcpClient () generates an exception when you click ' Stop listening ' or exit this form So you can use this exception to exit the loop Break } Every time a client connection is received, a corresponding thread is created to iterate over the information sent by the client; User user = new user (newclient); Thread threadreceive = new Thread (receivedata); Threadreceive.start (user); Userlist.add (user); Additemtolistbox (String. Format ("[{0}] enter", NewClient.Client.RemoteEndPoint)); Additemtolistbox (String. Format ("Current number of connected users: {0}", Userlist.count)); } } &lt;summary&gt; Process received client information &lt;/summary&gt; &lt;param name= "UserState" &gt; Client Information &lt;/param&gt; private void Receivedata (object userState) { User user = (user) userState; TcpClient client = user.client; while (Isnormalexit = = False) { string receivestring = null; Try { Reads a string from the network stream, this method automatically determines the string length prefix receivestring = User.br.ReadString (); } catch (Exception) { if (Isnormalexit = = False) { Additemtolistbox (String. Format ("lost contact with [{0}], terminated to receive this user information", client. Client.remoteendpoint)); Removeuser (user); } Break } Additemtolistbox (String. Format ("from [{0}]:{1}", user.client.client.remoteendpoint,receivestring)); string[] splitstring = Receivestring.split (', '); Switch (splitstring[0]) { Case "Login": User.username = splitstring[1]; Sendtoallclient (user,receivestring); Break Case "Logout": Sendtoallclient (user,receivestring); Removeuser (user); Return Case "Talk": String talkstring = Receivestring.substring (splitstring[0]. Length + splitstring[1]. Length + 2); Additemtolistbox (String. Format ("{0} to {1}" says: {2} ", user.username,splitstring[1],talkstring)); Sendtoclient (User, "talk," + User.username + "," + talkstring); foreach (User target in userlist) { if (Target.username = = splitstring[1] &amp;&amp; user.username!= splitstring[1]) { Sendtoclient (Target, "talk," + User.username + "," + talkstring); Break } } Break Default Additemtolistbox ("What meaning AH:" + receivestring); Break } } } &lt;summary&gt; Send messages to all customers &lt;/summary&gt; &lt;param name= "User" &gt; Specify which user to send &lt;/param&gt; &lt;param name= "message" &gt; Information content &lt;/param&gt; private void sendtoallclient (user user, String message) { string command = message. Split (', ') [0]. ToLower (); if (Command = = "Login") { Get all client online information to the currently logged-on user for (int i = 0; i &lt; Userlist.count; i++) { Sendtoclient (User, "login," + userlist[i].username); } Put yourself online and send it to all clients for (int i = 0; i &lt; Userlist.count; i++) { if (user.username!= userlist[i].username) { Sendtoclient (Userlist[i], "login," + user.username); } } } else if (Command = = "Logout") { for (int i = 0; i &lt; Userlist.count; i++) { if (userlist[i].username!= user.username) { Sendtoclient (Userlist[i], message); } } } } &lt;summary&gt; Send Message to User &lt;/summary&gt; &lt;param name= "User" &gt; Specify which user to send &lt;/param&gt; &lt;param name= "message" &gt; Information content &lt;/param&gt; private void sendtoclient (user user, String message) { Try { Writes a string to the network stream, which automatically appends the string length prefix User.bw.Write (message); User.bw.Flush (); Additemtolistbox (String. Format ("Send to [{0}]: {1}", User.username, message)); } Catch { Additemtolistbox (String. Format ("Send information to [{0}] failed", user.username)); } } <summary> removing users from </summary> <param name= "User" > Specify the user to remove </param> private void Removeuser (user user) { Userlist.remove (user); User. Close (); Additemtolistbox (String. Format ("Current number of connected users: {0}", Userlist.count)); } Private delegate void Additemtolistboxdelegate (String str); &lt;summary&gt; Append state information to the listbox &lt;/summary&gt; &lt;param name= "str" &gt; Information to append &lt;/param&gt; private void Additemtolistbox (String str) { if (lst_state.invokerequired) { Additemtolistboxdelegate d = additemtolistbox; Lst_state.invoke (d, str); } Else { LST_STATE.ITEMS.ADD (str); Lst_state.selectedindex = lst_state.items.count-1; Lst_state.clearselected (); } } &lt;summary&gt; Stop listening &lt;/summary&gt; &lt;param name= "Sender" &gt;&lt;/param&gt; &lt;param name= "E" &gt;&lt;/param&gt; private void Btn_stop_click (object sender, EventArgs e) { Additemtolistbox ("Start stopping the service, and then the user quits!") "); Isnormalexit = true; for (int i = userlist.count-1 i &gt;= 0; i--) { Removeuser (Userlist[i]); } Causes mylistener.accepttcpclient () to exit the listener thread by stopping listening Mylistener.stop (); Btn_start.enabled = true; btn_stop.enabled = false; } <summary> Events that are triggered when a window is closed </summary> <param name= "Sender" ></param> <param name= "E" ></param> private void Mainform_formclosing (object sender, FormClosingEventArgs e) { if (MyListener!= null) Btn_stop.performclick (); The Click event that raised the Btn_stop } } }

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<summary> Set IP and port based on the contents of the text file ' ServerIPAndPort.txt ' of the current program directory Format: 127.0.0.1:8885 </summary> private void Setserveripandport () { FileStream fs = new FileStream ("ServerIPAndPort.txt", FileMode.Open); StreamReader sr = new StreamReader (FS); String ipandport = Sr. ReadLine (); ServerIP = Ipandport.split (': ') [0]; Set IP Port = Int. Parse (Ipandport.split (': ') [1]); Set port Sr. Close (); Fs. Close (); } <summary> Start listening. </summary> <param name= "Sender" ></param> <param name= "E" ></param> private void Btn_start_click (object sender, EventArgs e) { MyListener = new TcpListener (Ipaddress.parse (ServerIP), port); Mylistener.start (); Additemtolistbox (String. Format ("Start monitoring client connections in {0}:{1}", ServerIP, Port)); Create a Thread Supervisor Client connection request Thread mythread = new Thread (listenclientconnect); Mythread.start (); btn_start.enabled = false; Btn_stop.enabled = true; } <summary> Receiving client connections </summary> private void Listenclientconnect () { TcpClient newclient = null; while (true) { Try { Newclient = Mylistener.accepttcpclient (); } Catch { AcceptTcpClient () generates an exception when you click ' Stop listening ' or exit this form So you can use this exception to exit the loop Break } Every time a client connection is received, a corresponding thread is created to iterate over the information sent by the client; User user = new user (newclient); Thread threadreceive = new Thread (receivedata); Threadreceive.start (user); Userlist.add (user); Additemtolistbox (String. Format ("[{0}] enter", NewClient.Client.RemoteEndPoint)); Additemtolistbox (String. Format ("Current number of connected users: {0}", Userlist.count)); } } <summary> Process received client information </summary> <param name= "UserState" > Client Information </param> private void Receivedata (object userState) { User user = (user) userState; TcpClient client = user.client; while (Isnormalexit = = False) { string receivestring = null; Try { Reads a string from the network stream, this method automatically determines the string length prefix receivestring = User.br.ReadString (); } catch (Exception) { if (Isnormalexit = = False) { Additemtolistbox (String. Format ("lost contact with [{0}], terminated to receive this user information", client. Client.remoteendpoint)); Removeuser (user); } Break } Additemtolistbox (String. Format ("from [{0}]:{1}", user.client.client.remoteendpoint,receivestring)); string[] splitstring = Receivestring.split (', '); Switch (splitstring[0]) { Case "Login": User.username = splitstring[1]; Sendtoallclient (user,receivestring); Break Case "Logout": Sendtoallclient (user,receivestring); Removeuser (user); Return Case "Talk": String talkstring = Receivestring.substring (splitstring[0]. Length + splitstring[1]. Length + 2); Additemtolistbox (String. Format ("{0} to {1}" says: {2} ", user.username,splitstring[1],talkstring)); Sendtoclient (User, "talk," + User.username + "," + talkstring); foreach (User target in userlist) { if (Target.username = = splitstring[1] && user.username!= splitstring[1]) { Sendtoclient (Target, "talk," + User.username + "," + talkstring); Break } } Break Default Additemtolistbox ("What meaning AH:" + receivestring); Break } } }

User.cs

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Using System; Using System.Collections.Generic; Using System.Linq; Using System.Text; Using System.Net.Sockets; Using System.IO; Namespace Syncchatserver {     class User     {          public tcpclient Client {get; private set;}         public binaryreader br {get; private set;}         public binarywriter bw {get; private set;}         public string UserName {get; set;}         public User (tcpclient client)          {             this.client = client;             NetworkStream networkstream = client. GetStream ();             br = new BinaryReader (NetworkStream);             bw = new BinaryWriter (NetworkStream);        } public void Close () { Br. Close (); Bw. Close (); Client. Close (); } } }

Program.cs

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Using System; Using System.Collections.Generic; Using System.Linq; Using System.Windows.Forms; Namespace Syncchatserver { Static Class Program { <summary> The main entry point for the application. </summary> [STAThread] static void Main () { Application.enablevisualstyles (); Application.setcompatibletextrenderingdefault (FALSE); Application.Run (New MainForm ()); } } }

Main.cs

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Namespace Syncchatserver { Partial class MainForm { <summary> The required designer variable. </summary> Private System.ComponentModel.IContainer components = null;        ///<summary>        / Clean up all resources that are in use.        ///</summary>         ///<param name= "disposing" > if the managed resource should be freed, true; otherwise, false. </param>         protected override void Dispose (bool disposing)         {              if (disposing && (components!= null))              {                 Components. Dispose ();            }             Base. Dispose (disposing);        } Code generated #region the Windows forms Designer &lt;summary&gt; Designer supports the required methods-No Use the Code Editor to modify the contents of this method. &lt;/summary&gt; private void InitializeComponent () { This.groupbox1 = new System.Windows.Forms.GroupBox (); This.lst_state = new System.Windows.Forms.ListBox (); This.btn_start = new System.Windows.Forms.Button (); This.btn_stop = new System.Windows.Forms.Button (); This.groupBox1.SuspendLayout (); This. SuspendLayout (); // GroupBox1 // THIS.GROUPBOX1.CONTROLS.ADD (this.lst_state); This.groupBox1.Location = new System.Drawing.Point (12, 12); This.groupBox1.Name = "GroupBox1"; This.groupBox1.Size = new System.Drawing.Size (523, 327); This.groupBox1.TabIndex = 0; This.groupBox1.TabStop = false; This.groupBox1.Text = "state information"; // Lst_state // This.lst_State.Dock = System.Windows.Forms.DockStyle.Fill; This.lst_State.FormattingEnabled = true; This.lst_State.ItemHeight = 12; This.lst_State.Location = new System.Drawing.Point (3, 17); This.lst_State.Name = "Lst_state"; This.lst_State.Size = new System.Drawing.Size (517, 304); This.lst_State.TabIndex = 0; // Btn_start // This.btn_Start.Location = new System.Drawing.Point (126, 346); This.btn_Start.Name = "Btn_start"; This.btn_Start.Size = new System.Drawing.Size (75, 23); This.btn_Start.TabIndex = 1; This.btn_Start.Text = "Start listening"; This.btn_Start.UseVisualStyleBackColor = true; This.btn_Start.Click + = new System.EventHandler (This.btn_start_click); // Btn_stop // This.btn_Stop.Location = new System.Drawing.Point (322, 346); This.btn_Stop.Name = "Btn_stop"; This.btn_Stop.Size = new System.Drawing.Size (75, 23); This.btn_Stop.TabIndex = 2; This.btn_Stop.Text = "Stop Listening"; This.btn_Stop.UseVisualStyleBackColor = true; This.btn_Stop.Click + = new System.EventHandler (This.btn_stop_click); // MainForm // This. Autoscaledimensions = new System.Drawing.SizeF (6F, 12F); This. AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; This. ClientSize = new System.Drawing.Size (547, 375); This. Controls.Add (This.btn_stop); This. Controls.Add (This.btn_start); This. Controls.Add (This.groupbox1); This. Name = "MainForm"; This. Text = "Syncchatserver"; This. FormClosing + = new System.Windows.Forms.FormClosingEventHandler (this. mainform_formclosing); This.groupBox1.ResumeLayout (FALSE); This. ResumeLayout (FALSE); } #endregion Private System.Windows.Forms.GroupBox GroupBox1; Private System.Windows.Forms.ListBox lst_state; Private System.Windows.Forms.Button Btn_start; Private System.Windows.Forms.Button btn_stop; } }

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