Child QWidget QSettings crash

sonichy

SIGSEGV crash at qobject.h line 324:
type, types, &SignalType::Object::staticMetaObject);

//main.cpp
int main(int argc, char *argv[])
{  
    QApplication a(argc, argv);
    a.setOrganizationName("HTY");
    a.setApplicationName("HTYDock");
    MainWindow w;
    w.show();
    return a.exec();
}

//mainwindow.cpp
QMainWindow
{
    DatetimeWidget *datetimeWidget = new DatetimeWidget;
}

//datetimewidget.h
{
private:
    enum {
        TEXT_CLOCK,
        DIGITAL_CLOCK,
        ANALOG_CLOCK
    } clock_type;
    QSettings settings;    // add this line cause crash
}

//datetimewidget.cpp
DatetimeWidget::DatetimeWidget(QWidget *parent) : QWidget(parent)
   ,settings(QCoreApplication::organizationName(), QCoreApplication::applicationName())
{

}

SGaist

Hi,

Based on your incomplete header file, it seems that you are creating a static QSettings object. Don't do that.

In any case, there's no need to have a class member for QSettings. You should create the object when needed.

sonichy

@SGaist It seems child QWidget can not use static QSettings.

DatetimeWidget::DatetimeWidget(QWidget *parent) : QWidget(parent)
{
    QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
}

JonB

@sonichy said in Child QWidget QSettings crash:

It seems child QWidget can not use static QSettings.

What do you mean? Your code shows getting a QSettings object for your application, no more than that. It's not even static. The fact that you have put the code you show inside a widget is neither here nor there. If something goes wrong with what you have written, you have to say so/what....