BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Detecting Client disconnect          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Roberto Meneghini Guest Posted: Tue Sep 26, 2006 2:45 am    Post subject: Detecting Client disconnect Hello, I'm writing a simple client/server application using INDY10's IdTCPServer and IdTCPClient for Delphi 2006 .NET. Everything works well (connect, disconnect, sending data back and forward). Is there a way for the server to know that the client has lost connection? Like the network cable was unplug or the computer crashed. I have tried using "Connection.IOHandler.Connected" and "Connection.CheckForGracefulDisconnect" but it always return positive even if the client computer is no longer connected. Any suggestions? Thanks, Roberto Back to top Jamie Dale Guest Posted: Tue Sep 26, 2006 3:00 am    Post subject: Re: Detecting Client disconnect Only thing you can do is a Keep-Alive type thing which you'd have to write yourself. J "Roberto Meneghini" <rmeneghini (AT) separationsystems (DOT) com> wrote in message news:45184e10$1 (AT) newsgroups (DOT) borland.com... Quote: Hello, I'm writing a simple client/server application using INDY10's IdTCPServer and IdTCPClient for Delphi 2006 .NET. Everything works well (connect, disconnect, sending data back and forward). Is there a way for the server to know that the client has lost connection? Like the network cable was unplug or the computer crashed. I have tried using "Connection.IOHandler.Connected" and "Connection.CheckForGracefulDisconnect" but it always return positive even if the client computer is no longer connected. Any suggestions? Thanks, Roberto Back to top Remy Lebeau (TeamB) Guest Posted: Tue Sep 26, 2006 3:33 am    Post subject: Re: Detecting Client disconnect "Roberto Meneghini" <rmeneghini (AT) separationsystems (DOT) com> wrote in message news:45184e10$1 (AT) newsgroups (DOT) borland.com... Quote: Is there a way for the server to know that the client has lost connection? The only way to do that is to use timeouts and keepalives in your own code. There is nothing in the socket API itself (or in Indy) to detect lost connections in a timely manner. This topic has been discussed many times before. Please go to http://www.deja.com and search through the newsgroup archives. Quote: I have tried using "Connection.IOHandler.Connected" and "Connection.CheckForGracefulDisconnect" but it always return positive even if the client computer is no longer connected. As they should be. Those methods are not meant to detect lost connections. 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