I want to make my application use dynamic unity quicklists. For building my application I am using C++ and the QtCreator IDE. When a menu action is triggered I want to be able to have access to a non-static function of my MainWindow class so as to be able to update the Graphical User Interface which can be accessed from inside 'normal' MainWindow's functions.

So, I am building up my quicklist like this (mainwindow.cpp):

void MainWindow::enable_unity_quicklist(){
    Unity_Menu = dbusmenu_menuitem_new();

    dbusmenu_menuitem_property_set_bool (Unity_Menu, DBUSMENU_MENUITEM_PROP_VISIBLE, FALSE);

    Unity_Stop = dbusmenu_menuitem_new();
    dbusmenu_menuitem_property_set(Unity_Stop, DBUSMENU_MENUITEM_PROP_LABEL, "Stop");

    dbusmenu_menuitem_child_append (Unity_Menu, Unity_Stop);

    g_signal_connect (Unity_Stop, DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED, G_CALLBACK(&fake_callback), (gpointer)this);

    if(!unity_entry)
        unity_entry = unity_launcher_entry_get_for_desktop_id("myapp.desktop");

    unity_launcher_entry_set_quicklist(unity_entry, Unity_Menu);

    dbusmenu_menuitem_property_set_bool(Unity_Menu, DBUSMENU_MENUITEM_PROP_VISIBLE, true);
    dbusmenu_menuitem_property_set_bool(Unity_Stop, DBUSMENU_MENUITEM_PROP_VISIBLE, true);
}

void MainWindow::fake_callback(gpointer data){
    MainWindow* m = (MainWindow*)data;
    m->on_stopButton_clicked();
}

void MainWindow::on_stopButton_clicked(){
   //stopping the process...
}

mainwindow.h:

private slots:
   void enable_unity_quicklist();
   void on_stopButton_clicked();
public slots:
   static void fake_callback(gpointer data);

This suggestion was taken from http://old.nabble.com/Using-g_signal_connect-in-class-td18461823.html

The program crashes immediately after I choose the 'Stop' action from the Unity Quicklist. Debugging the program shows that I am not able to access anything MainWindow related inside the on_stopButton_clicked() without crashing. For example, it crashes when doing this check (which is the first 2 lines of code inside this function):

if (!ui->stopButton->isEnabled())
        return;

I have also tested lots of other things that I found at the internet, but nothing of them worked. One interesting solution would be to use gtkmm (http://developer.gnome.org/gtkmm-tutorial/stable/sec-connecting-signal-handlers.html.en) but I am not used at all working on GTK applications (I work solely in Qt) and I don't know if this even suits to my occasion.

A compilable example indicating what the problem is can be found at: http://ubuntuone.com/7iKA3wnPmWVp8YNNDLlVQI (3.2Kb) If you are not familiar with the QtCreator IDE, you can compile with the following commands, as long as you have all the needed libraries:

cd dynamic_unity_quicklists_test; qmake -project; qmake; make