Client and Server Program

[Vinziee]

hi musefan i tried googling but cudnt find proper ans if u cud help me with the coding then i wud be really grateful to you thx in advance

[SeMartens]

Okay, let me try. Your server opens a socket at port 8080 with

byte[] recieved = server.Receive(ref ip);

This socket will be open all the time your program is running. You have to close this socket when your application exits. So you have to use following instruction:

server.Close()

Regards Sebastian

It's not a bug, it's a feature! Check out my CodeProject article Permission-by-aspect. Me in Softwareland.

[Lost User]

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[agent00zelda]

I am new to C# so I've been browsing the MSDN libraries to see how to use certain classes. After reading your post, I looked for and found the description of the UdpClient class. http://msdn.microsoft.com/en-us/library/system.net.sockets.udpclient.aspx There are examples on that site, but specifically you need to close your server connection, as the others were telling you. So, somewhere before the user closes the program, you have to call server.Close() I would recommend a finally block in your receive() method and closing the server there. But you would have to define server before the try block for this to work.

[Vinziee]

hey sebastian thx for ur reply . i tried that it still says only one usage of each socket is allowed ************************the new code for server************************************************ using System; using System.Threading; 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.Net; namespace server { public partial class Form1 : Form { UdpClient server; Thread thdserver; public Form1() { InitializeComponent(); } public void recieve() { try { server = new UdpClient(8080); while (true) { IPEndPoint ip = new IPEndPoint(IPAddress.Any, 0); byte[] recieved = server.Receive(ref ip); string returndata = Encoding.ASCII.GetString(recieved); listBox1.Items.Add(ip.Address.ToString() + " : " + returndata.ToString()); } } catch (SocketException ex) { MessageBox.Show(ex.Message); } } private void Form1_Load(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { //recieve(); thdserver = new Thread(new ThreadStart(recieve)); thdserver.Start(); } private void button2_Click(object sender, EventArgs e) { server.Close(); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { server.Close(); } } } *********************the new code for client**************************************** using System; using System.Threading; 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.Net; namespace ser_cli { public partial class Form1 : Form { UdpClient client = new UdpClient(); public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Thread th = new Thread(new ThreadStart(hear)); th.Sta

[Vinziee]

thx Mia Logan the actual problem lies with the server itself my client sends data properly but when i comes to receving the server throws an ecxception "the port can be used only once" this exception i'll check out msdn documentation of UDPClient as well thx for the advice

[SeMartens]

Check that every instance of the app is closed before you start a new try. By the way, does something else is running at port 8080? Maybe Apache Tomcat or something similar? Could be that your app is in conflict with another one. Regards Sebastian

It's not a bug, it's a feature! Check out my CodeProject article Permission-by-aspect. Me in Softwareland.

[Vinziee]

so how am i supposed to know wether the port is already occupied by some other application and which other port can i use

[0x3c0]

There's a list of standard ports here, but that doesn't include ports opened by applications which don't follow standards. Your best bet is going with something unlikely, like 65535; alternatively anything over 49151 should work

[SeMartens]

On windows you can use the "netstat"-command. This will list all applications and the ports the occupy.

It's not a bug, it's a feature! Check out my CodeProject article Permission-by-aspect. Me in Softwareland.

[Vinziee]

thx i used port 8080 n its working perfectly fine thx for ur help but now there is another problem is it possible to use the same udpclient object for sending as well as recieving data i mean if i create a UDPcleint object like void send() { UDPClient client = new UDPClient(); client.Connect(server, 8080); cleint.send(nedata); } void recieve() { UDPClient client = new UDPClient(); IpEndpoint ip = new IPEndponit(server, 8080) client.Recieve(ref ip) .... } void main() { thread thd_send = new thread(new threadStart(send)); thread thd_send = new thread(new threadStart(recieve)); } }

[Vinziee]

hey thx Sebastian ur soluion worked perfectly fine