[Qt-interest] QThread: infinite loops

[Malyushytsky, Alex]

I could not get to your code on the Windows, so just a few comments which might can help:

If you want to let window display itself, then start time consuming operation with QThread
I would suggest to use QTimer::singleShot( 0, ....) in QWidget constructor.
Put code creating QThread ( or at least call to QThread::start  ) in that slot.
That slow will be called when all events are processed ( widgets displayed, etc).

If you have very busy hardworking thread you might need to make sure QCoreApplication::processEvents periodically
so your gui is updated even if your other thread using all computer resources.

Alex



-----Original Message-----
From: qt-interest-bounces+alex=wai.com at qt.nokia.com [mailto:qt-interest-bounces+alex=wai.com at qt.nokia.com] On Behalf Of Nicholas Shatokhin
Sent: Thursday, February 24, 2011 6:27 PM
To: qt-interest at qt.nokia.com
Subject: [Qt-interest] QThread: infinite loops

I'm trying to use libfprint, but It was written on C and I'm creating a
layer
between qt4 and libfprint.
Because it need loop to scan finger and I don't want to freeze my program
I used QThread. But my program still frozing.
What's I doing wrong? My source are: http://ubuntuone.com/p/esE/

And I tryed to start thread in mainwindow constructor, but window didn't
showed, so I created button. How start scanning after showing window
without freezing of it?

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