[Solved]Login dialog and problem with quit app

[Hostel]

I have a problem with closing properly an application. 8 months ago I found a web with solution, but now that url is broken and I need yours help. I remember that problem is in application event loop, because when dialog is analised and closed then an event loop is not running yet. Here is my code - what should I add to resolve this issue?
@
int main(int argc, char *argv[])
{
QApplication a(argc, argv);

LogInDialog logInDialog; // QDialog class

logInDialog.exec();
int dialogResult = logInDialog.result();
if( dialogResult == QDialog::Accepted )
{
    MainWindow w;
    w.show();
}
// if a dialogResult is not equal QDialog::Accepted then I want to close app, but now an application is running
return a.exec();

}
@

[BilbonSacquet]

I don't know exactly what is your challenge here, but you don't need to start the application message loop:

@
if (dialogResult != QDialog::Accepted)
return -1;

MainWindow w;
w.show();

return a.exec();
@

[rokemoon]

Also you can write like this:
@
LogInDialog logInDialog; // QDialog class

if (logInDialog.exec() != QDialog::Accepted)
return -1;

MainWindow w;
w.show();

return a.exec();
@
So as I understand you have two buttons in your dialog (Ok & Cancel),
if you want that dialog return you QDialog::Accepted or QDialog::Rejected
you need to connect your buttons to dialog's slots "accept":http://doc.qt.nokia.com/latest/qdialog.html#accept and "reject":http://doc.qt.nokia.com/latest/qdialog.html#reject
Example:
@
class TestDialog: public QDialog
{
public:
TestDialog()
{
QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok
| QDialogButtonBox::Cancel);

 connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
 connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
 QVBoxLayout *layout = new QVBoxLayout();
 layout->addWidget(buttonBox);
 setLayout(layout);

}
};
@
and main
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int main(int argc, char *argv[])
{
QApplication a(argc, argv);

TestDialog dlg;
if (dlg.exec() != QDialog::Accepted)
  return -1;
Widget w;
w.show();

return a.exec();

}
@
All works fine.

[Hostel]

Thanks for reply. Unnecessery I was looking for complicated solution - in many cases, the simple solution is the best solution.

[rokemoon]

[quote author="Hostel" date="1321433146"]in many cases, the simple solution is the best solution.[/quote]
Yep you are right

[Hostel]

I tested a solution and I have a conclusion:

This is wrong:
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return 0;
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In Qt Creator I have a message that application was unexpected closed.

This is good:
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exit( 0 );
@