QFileDialog won't close when I tell it to

[Compeau]

I create a QFileDialog, call getOpenFileName on it, then try to close it. After that, I open the file in my code (which takes a while). My problem is that the QFileDialog doesn't close until after my code to open the file completes. Why is this? If I try to change the cursor on the QFileDialog to the WaitCursor, it doesn't take affect until after the open operation completes.

How do I get this QFileDialog to close right after getting a filename, or at least display the WaitCursor when the 'open' button is pressed?

[saa7_go]

I create a QFileDialog, call getOpenFileName on it, then try to close it.

Why do you create a QFileDialog object? QFileDialog::getOpenFileName() is a static function.

[Lykurg]

It's because your following code blocks the GUI thread. After receiving the file call

QCoreApplication::processEvents();

QCoreApplication::processEvents();

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and your dialog will close. Also have a look at keeping the GUI responsive. It was an article in Qt Quarterly.

[Compeau]

It's because your following code blocks the GUI thread. After receiving the file call

QCoreApplication::processEvents();

QCoreApplication::processEvents();

To copy to clipboard, switch view to plain text mode 

and your dialog will close. Also have a look at keeping the GUI responsive. It was an article in Qt Quarterly.

Thanks! I read the article, and used the following line of code to run my time-consuming open code asynchronously after getting the filename.

QMetaObject::invokeMethod(this, "slot name", Qt::QueuedConnection);

This completely fixed my problem.