I was able to open a connection using TCPClient, it is able to read and write data or string, however when I turn off the remote device or unplug the network cable, then check the client.connecte d property, it always shows "True". what could be happened? Thanks
May 28 '08
15  3362 
What I want to detect is whenever the remote device (server) is power off, then the software should be able to know the connection is lost or the socket is disconnected or it is closed and so on. Then the client will try to reconnect it back to the server. but it will fail to do so until the server is powered on again.
Plater 7,872
Recognized Expert Expert
That function I gave you will only tell you if the connected socket you had was closed. It detects physical disconnections (unplugged, power off, etc) as well as software disconnections (server software is closed, server closed connection)
If you are trying to find out if the server is running before connecting to it, that is completely different. And all you would do is turn down the connectiontimeo ut values so that it will return very quickly if no connection can be made.
Thanks Plater,
Where is to set connectiontimeo ut value? is it one of property of socket?
What I want is that the connection is established initially, if the server power off, my software should be able to detect this state change, then close the socket and wait for re-connection when the server power on. Thanks
Is there any way to ping the remote server with the socket in my application? by checking the response, I may detect whether the remote server is power down.
Yes, using "My.Computer.Ne twork.Ping" function is able to detect the remote server power down, it will return false if ping fail.
I have another question regarding the event of data received via network. Since TCPClient does not implement data_received event like Winsock, how can I program an event routine to handle this event? Thanks.
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