void MainWindow::closeEvent(QCloseEvent *event)
{
    QSettings settings("MyCompany", "MyApp");

    settings.beginGroup("prop");
    settings.setValue( "geometry", geometry() );
    settings.endGroup();
    QMainWindow::closeEvent(event);
}

void MainWindow::readSettings()
{
    QSettings settings("MyCompany", "MyApp");

    settings.beginGroup("prop");
    QStringList prop_keys = settings.allKeys();
    while( prop_keys.size() )
    {
        QString key = prop_keys.takeFirst();
        setProperty( qPrintable(key), settings.value(key) );
    }
    settings.endGroup();
}