Solved

How to listen on a single IP Address?

Posted on 2008-06-19
3
843 Views
Last Modified: 2010-05-18
Hi,

I try to write a window form, that can connect to a server (here: a web server) and send information to it.

But I have problems by receiving data from the server.
I could listen on every incoming address (port 80) but that would mean that also streams of the web browser I use at that moment would be received.

So I just want to receive data from one special address.

But I get an error:
The selected IP address is not valid in this context.

Is there any way to listen on single addresses?
(the server is my own at home and firewall settings are made)
class Tranmission

 {

  private IPAddress targetAddress;

  private IPEndPoint endpoint;

  public Tranmission()

  {

   targetAddress = IPAddress.Parse("213.211.224.32");

   endpoint = new IPEndPoint(targetAddress, 80);

  }
 

  public string listen()

  {

   string result = null;

   TcpListener listener = new TcpListener(endpoint);

   try

   {

    listener.Start();

    TcpClient client = listener.AcceptTcpClient();

    StreamReader inStream = new StreamReader(client.GetStream());

    result = inStream.ReadToEnd();

    client.Close();

    listener.Stop();

   }

   catch (SocketException ex)

   {

    MessageBox.Show(ex.ToString());

   }

   catch (StackOverflowException ex)

   {

    MessageBox.Show(ex.ToString());

   }

   return result;

  }
 

  public bool sendText(string text)

  {

   int i=0;

   do

   {

    try

    {

     TcpClient client = new TcpClient("www.gruenzeuch.de", 80);

     StreamWriter outStream = new StreamWriter(client.GetStream());

     outStream.WriteLine(text);

     outStream.Close();

     return true;

    }

    catch (SocketException ex)

    {

     i++;

    }

   }while(i<10);

   return false;

  }

 }

Open in new window

0
Comment
Question by:develc
  • 2
3 Comments
 
LVL 17

Expert Comment

by:Andres Perales
ID: 21826334
In your IIS setting you have to specifiy the IP address for that webserver to listen on...if you are using host headers this will not work...
0
 
LVL 1

Author Comment

by:develc
ID: 21826484
it is no Web-Application, it's a window form.
Yesterday I wrote a small listener, who listend on any address and it worked.
But that's not really what I want.
0
 
LVL 1

Accepted Solution

by:
develc earned 0 total points
ID: 21998459
After a long series of tries, I found the solution:


 public string listen(string targetIPAddress, int port)
  {
   string result = null;
   string[] target = targetIPAddress.Split('.');

   Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

   try
   {
    IPAddress address = IPAddress.Parse(targetIPAddress);
    IPEndPoint endpoint = new IPEndPoint(address, port);
    socket.Connect(endpoint);
    socket.Listen(1000);

    Socket clientSocket = socket.Accept();
    byte[] data = new byte[1024];

    int receivedLength = clientSocket.Receive(data);

    result = Encoding.UTF8.GetString(data);

    clientSocket.Close();
    socket.Close();

    return result;
   }
   catch(SocketException ex)
   {
    MessageBox.Show(ex.Message);
    return null;
   }
  }
0

Featured Post

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.
Hi friends,  in this video  I'll show you how new windows 10 user can learn the using of windows 10. Thank you.

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now