Use UDP broadcast mode to write simple information transmission tool ~

Using the UdpClient class
This is the test code I wrote, for reference ~

Using System;
Using System.Drawing;
Using System.Collections;
Using System.ComponentModel;
Using System.Windows.Forms;
Using System.Data;
Using System.Globalization;
Using System.Net;
Using System.Net.Sockets;
Using System.Threading;
Using System.Text;

Namespace Udpwintest
{
<summary>
Summary description of the Form1.
</summary>
public class Form1:System.Windows.Forms.Form
{
Private System.Windows.Forms.Button btnstart;
Private System.Windows.Forms.Button Btnjoin;
Private System.Windows.Forms.TextBox Txtserverip;
Private System.Windows.Forms.Button button1;
Private System.Windows.Forms.TextBox txtmsgsend;
Private System.Windows.Forms.TextBox Txtmessagemain;
<summary>
The required designer variable.
</summary>
Private System.ComponentModel.Container components = null;

private static UdpClient m_client;

private static int listenerport = 80;
private static int senderport = 80;
private static int localport;
private static int remoteport;

private static string M_szhostname;

private static IPAddress m_groupaddress;
private static Iphostentry M_localhost;
private static IPEndPoint M_remoteep;
Private System.Windows.Forms.Button btnend;

private static bool M_done = FALSE;
Private System.Windows.Forms.Button btnclose;

Private Thread t = null;
Private Thread t2 = null;

Public Form1 ()
{
InitializeComponent ();
}

<summary>
Clean up all resources that are in use.
</summary>
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (Components!= null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing);
}

Code generated #region the Windows forms Designer
<summary>
Designer supports required methods-do not use the Code editor to modify
The contents of this method.
</summary>
private void InitializeComponent ()
{
This.btnstart = new System.Windows.Forms.Button ();
This.btnjoin = new System.Windows.Forms.Button ();
This.txtserverip = new System.Windows.Forms.TextBox ();
This.txtmessagemain = new System.Windows.Forms.TextBox ();
This.txtmsgsend = new System.Windows.Forms.TextBox ();
This.button1 = new System.Windows.Forms.Button ();
This.btnend = new System.Windows.Forms.Button ();
This.btnclose = new System.Windows.Forms.Button ();
This. SuspendLayout ();
//
Btnstart
//
This.btnStart.Location = new System.Drawing.Point (16, 16);
This.btnStart.Name = "Btnstart";
This.btnStart.TabIndex = 0;
This.btnStart.Text = "Start";
This.btnStart.Click + = new System.EventHandler (This.btnstart_click);
//
Btnjoin
//
This.btnJoin.Location = new System.Drawing.Point (408, 16);
This.btnJoin.Name = "Btnjoin";
This.btnJoin.TabIndex = 1;
This.btnJoin.Text = "Join";
This.btnJoin.Click + = new System.EventHandler (This.btnjoin_click);
//
Txtserverip
//
This.txtServerIP.Location = new System.Drawing.Point (304, 16);
This.txtServerIP.Name = "Txtserverip";
This.txtServerIP.Size = new System.Drawing.Size (96, 21);
This.txtServerIP.TabIndex = 2;
This.txtServerIP.Text = "10.89.58.220";
//
Txtmessagemain
//
This.txtMessageMain.Location = new System.Drawing.Point (16, 48);
This.txtMessageMain.Multiline = true;
This.txtMessageMain.Name = "Txtmessagemain";
This.txtMessageMain.Size = new System.Drawing.Size (464, 184);
This.txtMessageMain.TabIndex = 3;
This.txtMessageMain.Text = "";
//
Txtmsgsend
//
This.txtMsgSend.Location = new System.Drawing.Point (16, 240);
This.txtMsgSend.Name = "Txtmsgsend";
This.txtMsgSend.Size = new System.Drawing.Size (384, 21);
This.txtMsgSend.TabIndex = 4;
This.txtMsgSend.Text = "";
//
Button1
//
This.button1.Location = new System.Drawing.Point (408, 240);
This.button1.Name = "Button1";
This.button1.TabIndex = 5;
This.button1.Text = "Send";
This.button1.Click + = new System.EventHandler (this. Send_click);
//
Btnend
//
This.btnEnd.Location = new System.Drawing.Point (112, 16);
This.btnEnd.Name = "Btnend";
This.btnEnd.TabIndex = 6;
This.btnEnd.Text = "End";
This.btnEnd.Click + = new System.EventHandler (This.btnend_click);
//
Btnclose
//
This.btnClose.Location = new System.Drawing.Point (208, 16);
This.btnClose.Name = "Btnclose";
This.btnClose.TabIndex = 7;
This.btnClose.Text = "Close";
This.btnClose.Click + = new System.EventHandler (This.btnclose_click);
//
Form1
//
This. AutoScaleBaseSize = new System.Drawing.Size (6, 14);
This. ClientSize = new System.Drawing.Size (504, 273);
This. Controls.Add (This.btnclose);
This. Controls.Add (This.btnend);
This. Controls.Add (This.button1);
This. Controls.Add (This.txtmsgsend);
This. Controls.Add (This.txtmessagemain);
This. Controls.Add (This.txtserverip);
This. Controls.Add (This.btnjoin);
This. Controls.Add (This.btnstart);
This. Name = "Form1";
This. Text = "Udpwintest";
This. ResumeLayout (FALSE);

}
#endregion

<summary>
The main entry point for the application.
</summary>
[STAThread]
static void Main ()
{
Application.Run (New Form1 ());
}

private void btnStart_Click (object sender, System.EventArgs e)
{
LocalPort = Senderport;
RemotePort = Listenerport;

M_szhostname = Dns.gethostname ();
M_localhost = Dns.gethostbyname (m_szhostname);

Addtomain ("Local Port:" + LocalPort + ", Remote:" + remoteport);
Addtomain ("Initializing ...");

String localhostip = M_localhost.addresslist[0]. ToString ();
string[] Arrip = localhostip.split (New char[]{'. '});
Localhostip = "224" + "+" + arrip[1] + "." + arrip[2] + "." + arrip[3];

Initialize (Localhostip);

Addtomain ("Starting Listener thread ...");

Start a new thread
t = new Thread (new ThreadStart (Listener)); Listening for threads
T.start ();

this.btnJoin.Enabled = false;
this.btnStart.Enabled = false;

}

private void Btnjoin_click (object sender, System.EventArgs e)
{
LocalPort = Senderport;
RemotePort = Listenerport;

M_szhostname = Dns.gethostname ();
M_localhost = Dns.gethostbyname (m_szhostname);

Addtomain ("Local Port:" + LocalPort + ", Remote:" + remoteport);
Addtomain ("Initializing ...");

string ServerIP = This.txtServerIP.Text;
string[] Arrip = serverip.split (New char[]{'. '});
ServerIP = "224" + "+" + arrip[1] + "." + arrip[2] + "." + arrip[3];

Initialize (ServerIP);

Addtomain ("Starting Listener thread ...");

Start a new thread
t = new Thread (new ThreadStart (Listener)); Listening for threads
T.start ();

this.btnStart.Enabled = false;
this.btnJoin.Enabled = false;
}

private void Send_click (object sender, System.EventArgs e)
{
Start a new thread
t2 = new Thread (new ThreadStart (Send)); Listening for threads
T2. Start ();
}

<summary>
///
</summary>
public void Send ()
{
Thread.Sleep (1000);

Byte [] buffer = NULL;

System.Text.Encoding ASCII = System.Text.Encoding.ASCII;

String s = this.txtMsgSend.Text;

if (s.length = 0)
return;

if (String.Compare (s,0, "@", 0,1,true,cultureinfo.invariantculture) = = 0)
{
M_done = true;
s = m_szhostname + ": @";
Application.exit ();
}
Else
{
s = m_szhostname + ":" + S;
}


Buffer = new Byte[s.length + 1];

int len = ASCII. GetBytes (S.tochararray (), 0, s.length, buffer, 0);

int ecode = m_client.send (buffer, Len, m_remoteep);

if (ecode <= 0)
{
Addtomain ("Error in Send:" + Ecode);
}

T2. Abort ();

}

public static void Terminate ()
{
M_client.dropmulticastgroup (m_groupaddress);
}

<summary>
Class
</summary>
public void Initialize (string IP)
{

M_client = new UdpClient (localport);

Set the network address of a broadcast group
m_groupaddress = Ipaddress.parse (IP);

Try
{//Join Broadcast Group
M_client.joinmulticastgroup (m_groupaddress, 100);
}
catch (Exception ex)
{
string mm = ex. message;
Addtomain ("Unable to join multicast group" + Ex.) message);
}

Set Network Endpoint
M_remoteep = new IPEndPoint (m_groupaddress, RemotePort);

}

<summary>
///
</summary>
public void Listener ()
{

Thread.Sleep (2000);

System.Text.Encoding ASCII = System.Text.Encoding.ASCII;


while (!m_done)
{
IPEndPoint endpoint = null;
byte[] data = m_client.receive (ref endpoint);

String strdata = ASCII. GetString (data);

if (Strdata.indexof (": @") > 0)
{
Char [] separators = {': '};
String [] VARs = Strdata.split (separators);

if (vars[0] = = m_szhostname)//main system is off
{
Addtomain ("Shutting down Listener thread ...");
M_done = true;
}
Else
{
Addtomain (Vars[0] + "has left the conversation");
}
}
Else
{
if (Strdata.indexof (":") > 0)
{
Char [] separators = {': '};
String [] VARs = Strdata.split (separators);

if (Vars[0]!= m_szhostname)
{
Addtomain (strdata);
}
Else
{
Addtomain (strdata);
}
}
}
}
T.abort ();

Addtomain ("Listener thread finished ...");
Return
}

private void Addtomain (string _message)
{
This.txtMessageMain.Text = this.txtMessageMain.Text + _message + "\ r \ n";
}

private void Btnend_click (object sender, System.EventArgs e)
{
This.btnStart.Enabled = true;
This.btnJoin.Enabled = true;

Try
{
T.abort ();
T.interrupt ();
T2. Abort ();
T2. Interrupt ();

Addtomain ("Closing connection ...");

M_client.dropmulticastgroup (m_groupaddress);
}
Catch
{}


Terminate ();
}

private void btnClose_Click (object sender, System.EventArgs e)
{
Try
{
T.abort ();
T.interrupt ();
T2. Abort ();
T2. Interrupt ();
Terminate ();
}
Catch
{}
Application.exit ();
}
}
}