http://www.switchonthecode.com/tutorials/csharp-tutorial-simple-threaded-tcp-server
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Linq;
using System.Net.Sockets;
using System.Threading;
using System.Net;
namespace TcpTrainServer
{
public partial class Form1 : Form
{
private static TcpListener tcpListener;
private static Thread listenThread;
static NetworkStream clientStream;
static string textFromClient = "";
//private string endl = "\r\n";
public delegate void MessageReceivedHandler(string message);
public event MessageReceivedHandler MessageReceived;
public Form1()
{
InitializeComponent();
initiateListen();
}
private void initiateListen()
{
tcpListener = new TcpListener(IPAddress.Any, 8000);
listenThread = new Thread(new ThreadStart(ListenForClients));
listenThread.Start();
}
/// <summary>
/// Listens for client connections
/// </summary>
private static void ListenForClients()
{
tcpListener.Start();
while (true)
{
try
{
// Blocks until a client has connected to the server
TcpClient client = tcpListener.AcceptTcpClient();
// Create a thread to handle communication
// with connected client
Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
clientThread.Start(client);
}
catch (Exception)
{
}
}
}
private void buttonStartListening_Click(object sender, EventArgs e)
{
initiateListen();
}
/// <summary>
/// Handles client connections
/// </summary>
/// <param name="client"></param>
private static void HandleClientComm(object client)
{
TcpClient tcpClient = (TcpClient)client;
//NetworkStream clientStream = tcpClient.GetStream();
clientStream = tcpClient.GetStream();
byte[] message = new byte[4096];
int bytesRead;
do
{
bytesRead = 0;
try
{
// Blocks until a client sends a message
bytesRead = clientStream.Read(message, 0, 4096);
}
catch (Exception)
{
// A socket error has occured
break;
}
if (bytesRead == 0)
{
// The client has disconnected from the server
break;
}
// Message has successfully been received
ASCIIEncoding encoder = new ASCIIEncoding();
// Output message
textFromClient = tcpClient.Client.LocalEndPoint + " " + tcpClient.Client.RemoteEndPoint +
encoder.GetString(message, 0, bytesRead);
//Console.WriteLine("To: " + tcpClient.Client.LocalEndPoint);
//Console.WriteLine("From: " + tcpClient.Client.RemoteEndPoint);
//Console.WriteLine(encoder.GetString(message, 0, bytesRead));
} while (clientStream.DataAvailable);
// Release connections
// clientStream.Close();
//tcpClient.Close();
}
private void timer1_Tick(object sender, EventArgs e)
{
textBoxMessage.Text = textFromClient;
}
private void buttonClear_Click(object sender, EventArgs e)
{
textFromClient = "";
textBoxMessage.Clear();
}
private void buttonSendToClient_Click(object sender, EventArgs e)
{
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] buffer = encoder.GetBytes("Hello Server!");
clientStream.Write(buffer, 0, buffer.Length);
clientStream.Flush();
}
}
}
Client Side (User App)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
using System.Net;
namespace UserApp
{
public partial class Form1 : Form
{
static TcpClient client;
IPEndPoint serverEndPoint;
NetworkStream clientStream;
static String textFromServer;
public Form1()
{
InitializeComponent();
iniTCP();
}
public void iniTCP()
{
client = new TcpClient();
serverEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8000);
}
public void connectTCP()
{
client.Connect(serverEndPoint);
clientStream = client.GetStream();
// Create a thread to handle communication
// with connected client
Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
clientThread.Start(client);
}
public void sendMsg()
{
ASCIIEncoding encoder = new ASCIIEncoding();
byte[] buffer = encoder.GetBytes("Testing TCP/IP connection");
clientStream = client.GetStream();
clientStream.Write(buffer, 0, buffer.Length);
clientStream.Flush();
//clientStream.Close();
}
private void button1_Click(object sender, EventArgs e)
{
connectTCP();
}
private void buttonSendMessage_Click(object sender, EventArgs e)
{
sendMsg();
}
/// <summary>
/// Handles client connections
/// </summary>
/// <param name="client"></param>
private static void HandleClientComm(object client)
{
TcpClient tcpClient = (TcpClient)client;
NetworkStream clientStream = tcpClient.GetStream();
byte[] message = new byte[4096];
int bytesRead;
do
{
bytesRead = 0;
try
{
// Blocks until a client sends a message
bytesRead = clientStream.Read(message, 0, 4096);
}
catch (Exception)
{
// A socket error has occured
break;
}
if (bytesRead == 0)
{
// The client has disconnected from the server
break;
}
// Message has successfully been received
ASCIIEncoding encoder = new ASCIIEncoding();
// Output message
//textFromServer = tcpClient.Client.LocalEndPoint + " " + tcpClient.Client.RemoteEndPoint +
encoder.GetString(message, 0, bytesRead);
textFromServer = tcpClient.Client.LocalEndPoint + " " + tcpClient.Client.RemoteEndPoint +
encoder.GetString(message, 0, bytesRead);
} while (clientStream.DataAvailable);
}
private void buttonClose_Click(object sender, EventArgs e)
{
// Release connections
clientStream.Close();
//tcpClient.Close();
}
}
}
