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(&#41;&#41;, this, SLOT(change_text(&#41;&#41;);

}@

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.