TCP new connect to other IP
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Thread: TCP new connect to other IP

  1. #1
    Join Date
    Aug 2010
    Posts
    4

    TCP new connect to other IP

    Hello, I am trying to create program, which will send data with TCP. First connect and sending is all right, but if I try to connect to other IP, then it doesn't work.

    public Form1()
    {
    vlakno = new Thread(server); //for listening
    vlakno.IsBackground = true;
    vlakno.Start();
    InitializeComponent();
    adresa = IPAddress.Parse("127.0.0.1"); //first connect, it works when it isn't local too
    client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    pripojeni();
    }

    public void pripojeni() //connect
    {
    if (client.Connected == true)
    {
    Odesli("Konec/prenosu/tcp/orientace = tcp.aa.fc.des.er"); //send mesage about end of connect
    client.Shutdown(SocketShutdown.Both);
    client.Disconnect(true);
    }
    IPEndPoint ipEndPoint = new IPEndPoint(adresa, 2000);
    zmena = true;
    Thread.Sleep(2000);
    client.Connect(ipEndPoint); //here is an error in second connect
    }

    private void server()
    {
    poslouchany = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    local = new IPEndPoint(IPAddress.Any, 2000);
    poslouchany.Bind(local);
    poslouchany.Listen(100);
    mag = new byte[100];
    spojeni = poslouchany.Accept();
    spojeni.BeginReceive(mag, 0, 100, SocketFlags.None, new AsyncCallback(Prijem), spojeni);
    }

    public void Prijem(IAsyncResult ar)
    {
    Socket socket = ar.AsyncState as Socket;
    ASCIIEncoding kodovani = new ASCIIEncoding();
    int bytesRead = socket.EndReceive(ar);
    text = kodovani.GetString(mag);
    if (text == "Konec/prenosu/tcp/orientace = tcp.aa.fc.des.er\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0") //if disconecting
    {
    spojeni.Close();
    spojeni = null;
    spojeni = poslouchany.Accept();
    }
    mag = null;
    mag = new byte[100];
    spojeni.BeginReceive(mag, 0, 100, SocketFlags.None, new AsyncCallback(Prijem), spojeni);
    }


    If there is a new connect, then addresa will be changed and I will try to connect to other IP, but client.Connect say: "Once the socket has been disconnected, you can only reconnect again asynchronously, and only to a different EndPoint. BeginConnect must be called on a thread that won't exit until the operation has been completed."

    Can you please help me?

  2. #2
    DataMiser is offline Super Moderator Power Poster
    Join Date
    Jul 2008
    Location
    WV
    Posts
    4,845

    Re: TCP new connect to other IP

    Normally when I shut down my connection I dispose of the socket. When I want to connect I create a new socket. Never really had any issues using this approach.
    Always use [code][/code] tags when posting code.

  3. #3
    Join Date
    Sep 2011
    Location
    The Netherlands
    Posts
    32

    Re: TCP new connect to other IP

    adresa = IPAddress.Parse("127.0.0.1"); //first connect, it works when it isn't local too
    This is not an connect, it's just parsing the IPAddress string into an IPAddress object.
    Last edited by JapyDooge; September 28th, 2011 at 07:13 AM. Reason: typo

  4. #4
    Join Date
    Aug 2010
    Posts
    4

    Re: TCP new connect to other IP

    Yes, it's parsing address for first connect.

  5. #5
    Join Date
    Mar 2001
    Posts
    2,366

    Re: TCP new connect to other IP

    #1 You have not posted a complete source code listing. Please zip your code and post it. Otherwise we have to do more work than necessary to help you, and most don't want to.

    #2 Have you either disabled your windows firewall / firewall or made an exception in the firewall?
    ahoodin
    To keep the plot moving, that's why.

  6. #6
    Join Date
    Aug 2010
    Posts
    4

    Re: TCP new connect to other IP

    It's OK now. In method pripojeni at the end must be:
    client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    client.Connect(ipEndPoint);
    I think, it work now, thank

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