Send message to Specific Client by selecting number in comboBox

haan jae

Updated:

i modified the code, now can send private message by selecting number of client in comboBox, this is done when i remove the for loop coz if use the for loop, total messages will be sent at once depends on total number of clients connected.

but still have problem that when any client disconnect and reconnect again, private message cannot send anymore.

Any help will be appreciated, thanks in advance. sorry and pls ask again if the explanation is unclear.

here is the code i tried:

void indmsgbtn_Click(object sender, EventArgs e)

{

try

{

string msg = richtxtindmsg.Text;

msg = "Private Admin Message: " + msg + "\n";

byte[] byData = System.Text.Encoding.ASCII.GetBytes(msg);

//Socket workerSocket = null;

// for (int i = 0; i < m_workerSocketList.Count; i++)

//{

Socket workerSocket = (Socket)m_workerSocketList[comboBox1.SelectedIndex];

if (workerSocket != null)

{

if (workerSocket.Connected)

{

try

{

workerSocket.Send(byData);

}

catch (SocketException ex)

{

MessageBox.Show(ex.Message);

}

catch (SocketException se)

{

MessageBox.Show(se.Message);

}

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sam Hobbs15y ago
I am not sure if I understand what you are saying. I think you are saying that first you put a list of clients that are connected to your server into the combobox. Then some of them disconnect so then when you try to send something to the disconnected client you get an error. Is that what is happening? I do not know enough about sockets to know how to solve that problem.

If there is a way to asynchronously determine that a client disconnects, then you could use a handler to remove that client from the combobox. You probably need to use an Invoke somehow to update the form from the event handler.

Something else you could do is to determine if a client is still connected before trying to send something to it. You could do that at least once in indmsgbtn_Click.

My guess is that you should do both, but I do not know how to do either. I think there are articles in this web site that will help.
0
haan jae15y ago
o, i figured out whats the problem with my code, yes, you are correct, is not about the disconnect and reconnect anymore. The problem is when choosing no number or no such index number of connected client is selected in the comboBox (i set number 1 to 10 in the comboBox), this code: Socket workerSocket = (Socket)m_workerSocketList[comboBox1.SelectedIndex]; show error Argument out of range was unhandled, so code it to handle this error (code below). Yes, it will show the message box when select empty number or non match number to connected client in the comboBox. But have one problem, the client who disconnect, let say client no3 disconnect, if select no 3 in combobox to see whether the messagebox will show out, but unfortunately the message did not show and nothing response. Means as long as selecting the index number who the client already disconnect, the message box will not show out again. i wonder why it did not show...

Any idea why? can it be solved? Thanks for reply and sorry for such long explanation

void indmsgbtn_Click(object sender, EventArgs e)
{
string msg = richtxtindmsg.Text;
msg = "Private Admin Message: " + msg + "\n";
byte[] byData = System.Text.Encoding.ASCII.GetBytes(msg);
Socket workerSocket = null;

try
{
workerSocket = (Socket)m_workerSocketList[comboBox1.SelectedIndex];
}
catch(ArgumentOutOfRangeException)
{
MessageBox.Show("Please select a correct number");
return;
}

if (workerSocket != null)
{
if (workerSocket.Connected)
{
workerSocket.Send(byData);
}
}
}
0
Sam Hobbs15y ago
I think your subject "Send message to Specific Client by selecting number in comboBox" is misleading because the problem is not "selecting number in comboBox". The question seems to be about sockets but the subject does not indicate that so people that are the most likely to help might not look at the question.

You say "cannot send anymore"; why not? What happens? Is there an error message?
0