Quitting before the QApplication::exec()

[jsmax]

Hi all.

I have an application that works with databases. Before it starts executing it shows a dialog that asks for the connection parameters (user, password). I'd like to make that when a user presses the Cancel button, the application must quit.

For example:

//-------------------------//
int ret = ConnDialog.exec();
if (ret == QDialog::Rejected)
app.quit();
//-------------------------//
app.exec(); // Here starts the main loop
//-------------------------//

//-------------------------//
int ret = ConnDialog.exec();
if (ret == QDialog::Rejected)
app.quit();
//-------------------------//
app.exec(); // Here starts the main loop
//-------------------------//

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But it doesn't work. The QApplication::quit() works only inside the main loop.
How can i quit the application before the main loop ? Thnx ...