Client and Server Program
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A hi to all programming gurus i am an amature in network programming i have written an simple program for making a client and server in c# the cleint sends a msg and the server displays it in the listbox(lbconnections) The Problem is that---- this application runs perfectly after being deployed and afterward when i again use it it crashes (port already bieng used error) plz help me with this plzzzzzzzzzzzzzzzzzzzzzzzz..............:confused::confused::confused: ********************************coding 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 { public Form1() { InitializeComponent(); } public void recieve() { try { UdpClient 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) { Thread server = new Thread(new ThreadStart(recieve)); server.Start(); } } } ***************************************CODING FOR CLIENT********************************************* using System; 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 { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { UdpClient client = new UdpClient(); client.Connect(tbHost.Text, 8080); byte[] send = Encoding.ASCII.GetBytes("HELLO WORLD?"); client.Send(send, s
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A hi to all programming gurus i am an amature in network programming i have written an simple program for making a client and server in c# the cleint sends a msg and the server displays it in the listbox(lbconnections) The Problem is that---- this application runs perfectly after being deployed and afterward when i again use it it crashes (port already bieng used error) plz help me with this plzzzzzzzzzzzzzzzzzzzzzzzz..............:confused::confused::confused: ********************************coding 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 { public Form1() { InitializeComponent(); } public void recieve() { try { UdpClient 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) { Thread server = new Thread(new ThreadStart(recieve)); server.Start(); } } } ***************************************CODING FOR CLIENT********************************************* using System; 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 { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { UdpClient client = new UdpClient(); client.Connect(tbHost.Text, 8080); byte[] send = Encoding.ASCII.GetBytes("HELLO WORLD?"); client.Send(send, s
Well, you forget to close the server port when you app shuts down.
It's not a bug, it's a feature! Check out my CodeProject article Permission-by-aspect. Me in Softwareland.
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A hi to all programming gurus i am an amature in network programming i have written an simple program for making a client and server in c# the cleint sends a msg and the server displays it in the listbox(lbconnections) The Problem is that---- this application runs perfectly after being deployed and afterward when i again use it it crashes (port already bieng used error) plz help me with this plzzzzzzzzzzzzzzzzzzzzzzzz..............:confused::confused::confused: ********************************coding 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 { public Form1() { InitializeComponent(); } public void recieve() { try { UdpClient 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) { Thread server = new Thread(new ThreadStart(recieve)); server.Start(); } } } ***************************************CODING FOR CLIENT********************************************* using System; 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 { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { UdpClient client = new UdpClient(); client.Connect(tbHost.Text, 8080); byte[] send = Encoding.ASCII.GetBytes("HELLO WORLD?"); client.Send(send, s
you do know that error messages are not just random characters? mostly they tell you the problem and nearly always you can throw them into google and get an answer that will fix your problem in minutes.. both apply in this case
Life goes very fast. Tomorrow, today is already yesterday.
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Well, you forget to close the server port when you app shuts down.
It's not a bug, it's a feature! Check out my CodeProject article Permission-by-aspect. Me in Softwareland.
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you do know that error messages are not just random characters? mostly they tell you the problem and nearly always you can throw them into google and get an answer that will fix your problem in minutes.. both apply in this case
Life goes very fast. Tomorrow, today is already yesterday.
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hi SeMartens first of all thx for replyin but frankly speakin i checked out ur article but cudnt catch a word can u explain me in simpler words plzzzz.... .. help me with the solution
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.
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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
Text speak dictionary... 'u'='you' 'cud'='could' 'cudnt'='couldn't or couldnt' 'thx'='thanks' 'wud'='would' 'ans'='answer' and my personal favorite 'help me with the coding'='do it, send it to me for free, and I probably will stop trolling until I find something else I'm to lazy to research and fix'
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A hi to all programming gurus i am an amature in network programming i have written an simple program for making a client and server in c# the cleint sends a msg and the server displays it in the listbox(lbconnections) The Problem is that---- this application runs perfectly after being deployed and afterward when i again use it it crashes (port already bieng used error) plz help me with this plzzzzzzzzzzzzzzzzzzzzzzzz..............:confused::confused::confused: ********************************coding 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 { public Form1() { InitializeComponent(); } public void recieve() { try { UdpClient 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) { Thread server = new Thread(new ThreadStart(recieve)); server.Start(); } } } ***************************************CODING FOR CLIENT********************************************* using System; 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 { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { UdpClient client = new UdpClient(); client.Connect(tbHost.Text, 8080); byte[] send = Encoding.ASCII.GetBytes("HELLO WORLD?"); client.Send(send, s
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.
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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.
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
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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.
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
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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
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.
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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.
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so how am i supposed to know wether the port is already occupied by some other application and which other port can i use
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so how am i supposed to know wether the port is already occupied by some other application and which other port can i use
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.
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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
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)); } }
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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.