Problem with QThread..

? Offline

I am not sure you need threads, you can call processEvents from your infinite loop, which makes your GUI items responsive.

DenisKormalev

Please use @ tags for code. I edited your post, but in further posts please use it by yourself.

I don't see any usage of your MyThread class. And it should be inherited from QThread if you want to use threading.

? Offline

Usually (mis)using threads causes gui going unresponsive...

Qt already have event loop, using own events and/or signal/slot system.

http://doc.qt.nokia.com/latest/signalsandslots.html
http://doc.qt.nokia.com/latest/eventsandfilters.html

giesbert

endla.ravi what do you want to do in your infinite loop? what is it needed or? Is it background processing (could be done in a thread) or shall it make event processing (is already done by return a.exec();)?

Please specify your needs a bit more.

? Offline

@above,

I am actually coding for a messenger

and my client should always be in listen mode,it should be listening for messages from other clients.
But when the client i listening for messages,the client become crashes after some time.

How could i handle this?

giesbert

You can look at the examples: "here":http://doc.qt.nokia.com/4.7/network-network-chat.html

? Offline

You have to subclass MyThread from QThread then define in its run method what you want to do in the background. Did you read the "basic thread example":http://doc.qt.nokia.com/4.7/qthread.html#details ?

? Offline

Maybe in your case it's better to use the QThread::run() default implementation that runs a local (for thread) event loop.
You simply have to create your QWidget and your QThread, than use QObject::moveToThread() method and call the QThread::start() method.

References:
http://labs.qt.nokia.com/2010/06/17/youre-doing-it-wrong/
http://doc.qt.nokia.com/4.7/qthread.html#start
http://doc.qt.nokia.com/4.7/qobject.html#moveToThread

dangelog

[quote]and my client should always be in listen mode,it should be listening for messages from other clients.[/quote]

Please read my article here: http://developer.qt.nokia.com/wiki/ThreadsEventsQObjects . This seems to be the another case where threads are absolutely not needed (and indeed they just make your life a lot harder).

? Offline

[quote author="peppe" date="1292837082"]
Please read my article here: http://developer.qt.nokia.com/wiki/ThreadsEventsQObjects . This seems to be the another case where threads are absolutely not needed (and indeed they just make your life a lot harder).[/quote]

Really good article :D

? Offline

[quote author="Il Rugginoso" date="1292836477"] http://labs.qt.nokia.com/2010/06/17/youre-doing-it-wrong/[/quote] Thanks for the tipp! I didn't know the concepts behind the QThread class...

? Offline

[quote author="Wolf P." date="1292842687"][quote author="Il Rugginoso" date="1292836477"] http://labs.qt.nokia.com/2010/06/17/youre-doing-it-wrong/[/quote] Thanks for the tipp! I didn't know the concepts behind the QThread class...
[/quote]

You're welcome :D