Chat Application
/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury,
Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.IO;
using System.Net.Sockets;
using System.Threading;
namespace Wrox.WindowsGUIProgramming.Chapter9
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class ChatApplication : System.Windows.Forms.Form
{
internal System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.TextBox txtMessage;
private System.Windows.Forms.Button btSend;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
private System.Windows.Forms.ComboBox cmdHost;
private System.Windows.Forms.CheckBox chkSuspendClient;
private PeerConnection p = null;
public ChatApplication()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
p = new PeerConnection(4048, listBox1, cmdHost);
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.listBox1 = new System.Windows.Forms.ListBox();
this.txtMessage = new System.Windows.Forms.TextBox();
this.btSend = new System.Windows.Forms.Button();
this.cmdHost = new System.Windows.Forms.ComboBox();
this.chkSuspendClient = new System.Windows.Forms.CheckBox();
this.SuspendLayout();
//
// listBox1
//
this.listBox1.Name = "listBox1";
this.listBox1.Size = new System.Drawing.Size(688, 394);
this.listBox1.TabIndex = 0;
//
// txtMessage
//
this.txtMessage.Location = new System.Drawing.Point(8, 408);
this.txtMessage.Name = "txtMessage";
this.txtMessage.Size = new System.Drawing.Size(576, 20);
this.txtMessage.TabIndex = 1;
this.txtMessage.Text = "";
//
// btSend
//
this.btSend.Location = new System.Drawing.Point(608, 408);
this.btSend.Name = "btSend";
this.btSend.TabIndex = 2;
this.btSend.Text = "Send";
this.btSend.Click += new System.EventHandler(this.btSend_Click);
//
// cmdHost
//
this.cmdHost.Location = new System.Drawing.Point(8, 432);
this.cmdHost.Name = "cmdHost";
this.cmdHost.Size = new System.Drawing.Size(520, 21);
this.cmdHost.TabIndex = 3;
this.cmdHost.Text = "localhost";
//
// chkSuspendClient
//
this.chkSuspendClient.Location = new System.Drawing.Point(544, 432);
this.chkSuspendClient.Name = "chkSuspendClient";
this.chkSuspendClient.Size = new System.Drawing.Size(152, 24);
this.chkSuspendClient.TabIndex = 4;
this.chkSuspendClient.Text = "Suspend Client";
this.chkSuspendClient.CheckedChanged += new System.EventHandler(this.chkSuspendClient_CheckedChanged);
//
// ChatApplication
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(688, 462);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.chkSuspendClient,
this.cmdHost,
this.btSend,
this.txtMessage,
this.listBox1});
this.MaximizeBox = false;
this.Name = "ChatApplication";
this.Text = "Chat!";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new ChatApplication());
}
private void btSend_Click(object sender, System.EventArgs e)
{
p.Write(txtMessage.Text);
}
private void chkSuspendClient_CheckedChanged(object sender, System.EventArgs e)
{
if(chkSuspendClient.Checked==true)
{
p.Enabled = true;
}
else
{
p.Enabled = false;
}
}
}
public class PeerConnection
{
private System.Net.Sockets.TcpListener peerListener = null;
private System.Net.Sockets.TcpClient peerClient = null;
private System.Net.Sockets.NetworkStream netStream = null;
private Thread t1 = null;
private IntPtr formHandle;
private int port = 0;
private bool clientEnabled = true;
private ListBox lb;
private ComboBox cmb;
public PeerConnection(int port, ListBox formHandle, ComboBox cmdHost)
{
this.port = port;
this.lb = formHandle;
this.cmb = cmdHost;
t1 = new Thread(new ThreadStart(CreateListener));
t1.Name = "Listener Thread";
t1.Priority = ThreadPriority.AboveNormal;
t1.Start();
}
delegate void CallbackListbox(string message);
void SetListboxString(string item)
{
lb.Items.Add(item);
}
private void CreateListener()
{
Socket tc = null;
peerListener = new TcpListener(port);
peerListener.Start();
CallbackListbox clb = new CallbackListbox(SetListboxString);
while(true)
{
tc = peerListener.AcceptSocket();
byte[] byMessage = new byte[256];
Thread.Sleep(500);
int iLength = tc.Receive(byMessage, 0, byMessage.Length, SocketFlags.None);
if(iLength>0)
{
string message = System.Text.Encoding.Default.GetString(byMessage);
try
{
if(lb.InvokeRequired) lb.Invoke(clb, new object[]{message});
}
catch(Exception e)
{
message = e.Message;
}
finally
{
System.Diagnostics.Debug.WriteLine(message);
}
}
}
}
private void CreateClient(object message)
{
peerClient = new TcpClient();
peerClient.Connect(cmb.SelectedText, port);
netStream = peerClient.GetStream();
StreamWriter sw = new StreamWriter(netStream);
sw.Write((string)message);
sw.Flush();
peerClient.Close();
}
internal void Write(string message)
{
ThreadPool.QueueUserWorkItem(new WaitCallback(CreateClient), message);
}
internal bool Enabled
{
set
{
if(t1.ThreadState==ThreadState.Suspended&&value==true)
{
t1.Resume();
}
else if(t1.ThreadState!=ThreadState.Suspended&&value==false)
{
t1.Suspend();
}
clientEnabled = value;
}
get
{
return clientEnabled;
}
}
}
}
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