Networking Help
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  1. #1
    Join Date
    Oct 2010
    Posts
    1

    Question Networking Help

    Hi, I am trying to create a simple remote desktop application but I need some help, Visual C# says "Only one usage of each socket address (protocol/network address/port) is normally permitted" on statement "this.tcpListener.Start();" when I turn the system on more than once. How could I fix that? Here's the code:

    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.Sockets;
    using System.Threading;
    using System.Net;
    using System.Runtime.InteropServices;

    namespace NickRemoteDesktop
    {
    public partial class Main : Form
    {

    [DllImport("user32.dll")]
    public static extern void LockWorkStation();

    [DllImport("user32.dll")]
    public static extern int ExitWindowsEx(int uFlags, int dwReason);

    private bool on = false;

    private const int password = -2006878815;

    private TcpListener tcpListener;
    private Thread listenThread;

    public Main()
    {
    InitializeComponent();
    Reset();
    }

    private void Start()
    {
    this.tcpListener = new TcpListener(IPAddress.Any, 8000);
    this.listenThread = new Thread(new ThreadStart(ListenForClient));
    this.listenThread.Start();
    }

    private void ListenForClient()
    {
    this.tcpListener.Start();
    while (true)
    {
    TcpClient client = this.tcpListener.AcceptTcpClient();
    Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
    clientThread.Start(client);
    }
    }

    private void HandleClientComm(object client)
    {
    TcpClient tcpClient = (TcpClient)client;
    NetworkStream clientStream = tcpClient.GetStream();
    byte[] message = new byte[4096];
    int bytesRead;
    while (true)
    {
    bytesRead = 0;
    try
    {
    bytesRead = clientStream.Read(message, 0, 4096);
    }
    catch
    {
    break;
    }
    if (bytesRead == 0)
    {
    break;
    }
    ASCIIEncoding encoder = new ASCIIEncoding();
    switch (encoder.GetString(message, 0, bytesRead))
    {
    case "-2006878815NLOCK":
    LockWorkStation();
    break;
    case "-2006878815NLOGOUT":
    ExitWindowsEx(0, 0);
    break;
    case "-2006878815NSHUTDOWN":
    System.Diagnostics.Process.Start("Shutdown", "-s -t 10");
    break;
    case "-2006878815NGLOAT":
    MessageBox.Show("Nick Rocks!");
    break;
    case "-2006878815NBLUESCREEN":
    Form1 bluescreen = new Form1();
    bluescreen.Show();
    break;
    default:
    break;
    }
    }
    tcpClient.Close();
    }

    private void Stop()
    {
    this.listenThread = null;
    this.tcpListener = null;
    }

    private void Reset()
    {
    maskedTextBox1.Text = "";
    if (this.on == true)
    {
    label2.ForeColor = Color.Green;
    label2.Text = "ON";
    button1.Text = "Turn Off";
    Start();
    }
    else
    {
    label2.ForeColor = Color.Red;
    label2.Text = "OFF";
    button1.Text = "Turn On";
    Stop();
    }
    }

    private void SubmitKey()
    {
    if (on == true)
    {
    if (maskedTextBox1.Text.GetHashCode() == password) this.on = false;
    }
    else if (on == false)
    {
    if (maskedTextBox1.Text.GetHashCode() == password) this.on = true;
    }
    Reset();
    }

    private void maskedTextBox1_KeyDown(object sender, KeyEventArgs e)
    {
    if (e.KeyCode == Keys.Enter) SubmitKey();
    }

    private void button1_Click(object sender, EventArgs e)
    {
    SubmitKey();
    }

    private void button3_Click(object sender, EventArgs e)
    {
    Application.Exit();
    }

    private void button2_Click(object sender, EventArgs e)
    {
    Hide();
    }

    private void notifyIcon1_DoubleClick(object sender, EventArgs e)
    {
    Show();
    }

    }
    }

    Thanks.

  2. #2
    Join Date
    Sep 2008
    Location
    Netherlands
    Posts
    865

    Re: Networking Help

    Please use code tags to make the code readable

    [ code]your code here [ /code] (but then without the spaces)

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