Q: Socket class - disconnect notify??

[HABJAN ®iga]

Is there a way to be notifyed (callback, event,...) when the connection of
socket was closed... The WinSock activex in vb6 had event ondisconnect...

I get exception when i try to send some data, but i need disconnect info
sooner.

I have a solution with timer that checks the state of socket, but i don't
like to use timers...

best re,
habix

 

[William Armstrong]

If you have a pending read waiting on the Socket, it will fail with an
exception when the socket is closed. That should give you more timely
notification about the disconnection.

 

[HABJAN ®iga]

Thanks for response Will,

I found a sample class, that uses frameworks socket class and exports itself
with events and methods like WinSock.ocx in VB6. I looked up how the
disconnect event was raised:

The class uses async callbacks for reading the data, and when you call
EndReceive function on callback, the return value is BytesRead. If you get 0
bytes, the disconnect event is raised.

best re,
habix

 

[_Andy_]

Is there a way to be notifyed (callback, event,...) when the connection of
socket was closed... The WinSock activex in vb6 had event ondisconnect...

I get exception when i try to send some data, but i need disconnect info
sooner.

I have a solution with timer that checks the state of socket, but i don't
like to use timers...

best re,
habix

You should catch and handle the exception (fire your own event if you
need to). You will also note that a socket can be closed _during_ a
send or read operation. In fact, you should handle all exceptions.

Rgds,