[Bug] Why QDialog display empty rarely.

brucezcg

I create the dialog in a Wdiget's constructor function like this.
{
……
mDialogBank = new DlgBank(this);
}

//Click button display the dialog.
void Wgt_Tuning::on_btnBank_clicked()
{
//Display the dialog.
if (QDialog::Accepted == mDialogBank->exec()) {
}
}

jsulm

@brucezcg On which platform do you have this behaviour?
You also could try to run through debugger and check the stack trace when this happens.

brucezcg

@jsulm Qt 5.12.3 mingw7 32bit.
This phenomena is never occur on my PC, It occurred on my college's PC rarely.

jsulm

@brucezcg What is the OS on that PC and graphics driver?

brucezcg

@jsulm Win10 & Intel HD Graphics 520

jsulm

@brucezcg Try to update the graphics driver.

brucezcg

@jsulm But this is very rarely. most of the time the dialog display well.

mrjj

@brucezcg
Hi
maybe a rare driver bug. :)

In any case, if possible you should test if a new driver helps on your college's PC.

brucezcg

@mrjj Thanks for the reply, and I try to use QWidget instead of QDialog.

Christian Ehrlicher