Re: TCP listener - check for connection status

[Peter Duniho]

On Wed, 06 Aug 2008 08:33:55 -0700, Markgoldin <ma************ *@yahoo.com>
wrote:

tcpl = new TcpListener(ipe );
TcpClient tcpc = tcpl.AcceptTcpC lient();
while (true)
{
// get data
while (true)
{
// if contidion met break;
}
}

How can I check if a client has been disconnected from the listener?

Try to send something.

Connection status can only be determined when you send data. If the
connection is broken when you send data, you'll get an exception.
Otherwise, you won't receive any notification.

You can design your protocol to send periodic "keep alive" messages, but
that's not usually the right thing to do. It's a _good_ thing that TCP
doesn't detect a broken connection until you actually try to use it. That
allows transient problems to occur without affecting your connection.

Pete

[William Stacey [C# MVP]]

Good answer. When you think about it, it would not even be possible without
some kind of keepalive because your never going to get any back channel
notification that the host is down or a link was broken until you actually
try to send a packet. Unless your waiting on some push notification deal, a
keepalive is not desired anyway.

--william

"Peter Duniho" <Np*********@nn owslpianmk.comw rote in message
news:op******** *******@petes-computer.local. ..

On Wed, 06 Aug 2008 08:33:55 -0700, Markgoldin <ma************ *@yahoo.com>
wrote:

>tcpl = new TcpListener(ipe );
TcpClient tcpc = tcpl.AcceptTcpC lient();
while (true)
{
// get data
while (true)
{
// if contidion met break;
}
}

How can I check if a client has been disconnected from the listener?

Try to send something.

Connection status can only be determined when you send data. If the
connection is broken when you send data, you'll get an exception.
Otherwise, you won't receive any notification.

You can design your protocol to send periodic "keep alive" messages, but
that's not usually the right thing to do. It's a _good_ thing that TCP
doesn't detect a broken connection until you actually try to use it. That
allows transient problems to occur without affecting your connection.

Pete