Server Client application

Question

This is my server code I have a problem because my program freeze and don't know what is wrong.

   private void button1_Click(object sender, EventArgs e)
    {
        if (button1.Text == "Listen")
        {
            tcpl = new TcpListener(IPAddress.Any, 5555);
            tcpl.Start();

            try
            { 
                // get random word from text
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.Filter = "Txt |*.txt";
                ofd.Title = "Tekst";
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    String[] myString = File.ReadAllLines(ofd.FileName);
                    textBox1.Text = myString[r.Next(myString.Length)];
                }

                    Socket socketForClient = tcpl.AcceptSocket();
                    if (socketForClient.Connected)
                    {
                        MessageBox.Show("Client connected" + socketForClient.RemoteEndPoint.ToString());
                        NetworkStream networkStream = new NetworkStream(socketForClient);
                        StreamWriter sw = new StreamWriter(networkStream);
                        StreamReader sr = new StreamReader(networkStream);
                        string line = sr.ReadLine();
                        richTextBox1.Text = "Accepted: " + line;
                        line = line.ToUpper();
                        sw.WriteLine(line);
                        richTextBox1.Text = "Sended : " + line;
                        sw.Flush();
                    }
                    socketForClient.Close();

            }
            catch (SocketException ex)
            {
                MessageBox.Show(ex.Message);
            }
            button1.Text = "stop";
        }
        else 
        {
            tcpl.Stop();
            MessageBox.Show("Disconnected");
            button1.Text = "Listen";
        }

My program freeze in line : Socket socketForClient = tcpl.AcceptSocket(); and don't know why. I wrote this on an example from school. Thanks for help.

Its doesn't look like WPF, as they have RoutedEventArgs, ASP.NET doesn't have OpenFileDialog or MessageBox classes ... I'm guessing Windows Forms. — Dominic Zukiewicz, Apr 03 '12 at 14:07

score 6 · Accepted Answer · answered Apr 02 '12 at 14:13

6

AcceptSocket() is a blocking call that only returns after a client connects. If you call that in a UI thread, the UI will freeze.

You need to do that on a background thread.

answered Apr 02 '12 at 14:13

SLaks

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Server Client application

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