QWizard produces SIGILL

[lauwe]

I have a slot in my 'MainWindow' which is called from another thread and is supposed to show a QWizard (to reconnect some socket-connection). This is the code for this slot:

void
MainWindow::_reconnect(void) {
 
    QWizard wiz();
    ConnectionPage connectionPage(_project->getSettings());
    wiz.setWindowTitle("Title");
    wiz.addPage(&connectionPage);
 
    if(wiz.exec() != QDialog::Accepted) {
      delete _project;
      _project = NULL;
      return;
    }
}

void
MainWindow::_reconnect(void) {

    QWizard wiz();
    ConnectionPage connectionPage(_project->getSettings());
    wiz.setWindowTitle("Title");
    wiz.addPage(&connectionPage);

    if(wiz.exec() != QDialog::Accepted) {
      delete _project;
      _project = NULL;
      return;
    }
}

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The problem is that when wiz.setWindowTitle (or any other method of QWizard) is called, a SIGILL occurs. The following is the trace:

0 ?? 0 0x4ec8356
1 QApplication::notify qapplication.cpp 4427 0x9abc60
2 QCoreApplication::notifyInternal qcoreapplication.cpp 731 0x6a2015f8
3 QCoreApplication::sendEvent qcoreapplication.h 215 0x1024e3a
4 QWidget::setWindowTitle qwidget.cpp 6005 0x9f1c6a
5 MainWindow::_reconnect mainwindow.cpp 273 0x40355e
...

When I change the code in the slot to show a QMessageBox (in a similar way) everything is fine.

What could cause this?

[wysota]

QWizard wiz();

QWizard wiz();

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is a declaration of a method called "wiz" taking no arguments and returning a QWizard object. You probably wanted this:

QWizard wiz;

QWizard wiz;

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Your current code shouldn't even compile.

[lauwe]

I'm sorry, indeed this does not compile and I meant

QWizard wiz

QWizard wiz

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I had tried to pass a pointer to the constructor to make MainWindow its parent (which changed nothing).

[wysota]

Change line #5 to:

ConnectionPage *connectionPage = new ConnectionPage(_project->getSettings());

ConnectionPage *connectionPage = new ConnectionPage(_project->getSettings());

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and adjust the next two lines accordingly.