Saving Window Size State

class MainWindow : public QMainWindow {

Q_OBJECT

public:

MainWindow(QWidget *parent = 0) : QMainWindow(parent) {
 QSettings settings;
 restoreGeometry(settings.value("mainWindowGeometry").toByteArray());
 // create docks, toolbars, etc…
 restoreState(settings.value("mainWindowState").toByteArray());
}

void closeEvent(QCloseEvent *event) {
 QSettings settings;
 settings.setValue("mainWindowGeometry", saveGeometry());
 settings.setValue("mainWindowState", saveState());
}

};

int main(int argc, char *argv[]) {

QApplication a(argc, argv);
QCoreApplication::setOrganizationDomain("OrgDomain");
QCoreApplication::setOrganizationName("OrgName");
QCoreApplication::setApplicationName("AppName");
QCoreApplication::setApplicationVersion("1.0.0");

MainWindow w;
w.show();

return a.exec();

}