Question

I run my application on a network and in some cases the client lost connection to the server. After this time, when I wanted to send a message to the server I receive the following error: Operation not allowed on non-connected sockets (something like this).

I thought to create an event for object type TcpClient and when tcp_obj.Connected = false to call a function to discontinue execution of the current code. How could I do this?

Or giving me other suggestios.

Thanks.

Answer 1

I know at least from socket programming in Java that when a client loses connection to the server, the server does not and can not know about it. You need a heartbeat of some sort to detect the early disconnection.

We often use a heartbeat in our client/server applications to detect early disconnections and log them on the server. This way the server can close the associated socket and release the connection back to the pool.

Simply send a command to the client periodically and wait for a response. If no response is garnered within a timeout assume disconnect and close streams.