[Qt-interest] ASSERT: "qApp && qApp->thread() == QThread::currentThread"

[Arnold Krille]

On Tuesday 26 May 2009 15:57:21 Wasilios Goutas wrote:
> It seems to me, that the thread initializd the QApplication instance has
> also to be the thread with owns the instance of the used widgets.
> Is this right?

That is right (and stated often enough both in this lists archives and the 
official documentation of qt).
QApplication initializes the graphics connection with the os/environment. And 
graphics (=widgets and their updates/painting) can only be done in the thread 
that has the graphics connection.
Which means: If you initialize QApplication in your main thread, all the 
widgets have to live in the main thread too (and some other classes using X-
functions too). If you initialize the QApplication in a sub thread, all the 
widgets have to live in that subthread too.

Arnold
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