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Qt-interest Archive, November 2006
Why does QTcpSocket disconnect after ~30 sec?

Message 1 in thread

Hello,

I am trying to write a client/threaded server app using QTcpSocket.
After about 30 sec, my client gets dissconnected, any idea why?
In the thread's run() I do :

   tcpSocket->waitForDisconnected();
   tcpSocket->disconnectFromHost();
   QTextStream out(stdout);
   out << "Client disconnected!" << endl;

The rest is implemented using signals/slots.

Also, if my client dies I get a Segmentation fault on the server, what
needs to be done when a client dies to prevent this?

Thank you very much,
Gabriel

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Message 2 in thread

On Sunday 05 November 2006 12:55, Gabriel Rossetti wrote:
> I am trying to write a client/threaded server app using QTcpSocket.
> After about 30 sec, my client gets dissconnected, any idea why?
> In the thread's run() I do :
>
>    tcpSocket->waitForDisconnected();
>    tcpSocket->disconnectFromHost();

You should exchange these two lines. Give the socket the command to 
disconnect first and then wait for it to complete the command.

You are seeing 30s because that is the default timeout of the wait* 
functions.

>    QTextStream out(stdout);
>    out << "Client disconnected!" << endl;
>
> The rest is implemented using signals/slots.
>
> Also, if my client dies I get a Segmentation fault on the server, what
> needs to be done when a client dies to prevent this?

For this socket call deleteLater() instead of delete'ing it directly - TCP 
sockets need to do some cleaning up after close() or shutdown() has been 
called, so you should schedule the deletion after the closing.



	Konrad

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