SOLVED: Edit dialog from MainWindow

[Qatto]

Hello,

I have been trying to set the text of a dialog/designer form that has no class but is called from the MainWindow class when a dialog button is clicked. If it's possible how would you got about it? The slot change_text() sets the content for ap.lineEdit
So far the connector won't call change_text() probably because the dialog has been executed already.

@void MainWindow::launch_dialog()
{
QDialog *diag = new QDialog;
Ui::Dialog ap;
ap.setupUi(diag);
diag->setModal(true);
diag->exec();

connect(ap.pushButton, SIGNAL(clicked()), this, SLOT(change_text()));

}@

[JKSH]

You can connect before exec()

[Qatto]

Connecting before exec() crashes the app. Please look at my change_text() and advise how it's supposed to be

@void MainWindow::change_text()
{
Ui::Dialog av;
av.pushButton->setText("clicked");
}@

[Qatto]

Ok, got it. ap must be global

[SGaist]

Hi,
No ap must not be global.

What JKSH meant is that you should have moved the connect statement just before calling exec

[Qatto]

The problem is that declaring another ap inside the slot crashes the application. By global I meant ap should be declared inside the MainWindow class declaration not outside.

[JKSH]

[quote author="Qkato" date="1376606459"]The problem is that declaring another ap inside the slot crashes the application.[/quote]That crash is not caused by the code you posted. It's probably a bug somewhere else that causes memory corruption.

[quote]By global I meant ap should be declared inside the MainWindow class declaration not outside.[/quote]Yes, that's what you need to do. The correct term is "member variable", not "global".

[quote author="Qkato" date="1376519112"]
@
void MainWindow::launch_dialog()
{
QDialog *diag = new QDialog;
Ui::Dialog ap;
ap.setupUi(diag);
diag->setModal(true);
diag->exec();

...
}
@
[/quote]Your original code has a memory leak -- diag is never deleted. Make sure you clean up properly.