Qt Mainwindow menu signals

Question

I've "Core" object that handles QMainWindow.
Core.h code

class Core : public QObject
{
    Q_OBJECT
public:
    explicit Core(QObject *parent = 0);
    ~Core();
    void appInit();
    int getAuth();

public slots:
    void appExit();

private slots:
    void appMenuTriggered(QAction *action);

private:
    void preInit();
    MainWindow *mwnd;
};

Core.cpp code

Core::Core(QObject *parent) : QObject(parent)
{
    qDebug() << "Core::Constructor called";
    preInit();
}

Core::~Core()
{
    delete mwnd;
    qDebug() << "Core::Destructor called";
}

int Core::getAuth()
{
    LoginDialog *login = new LoginDialog();
    int r = login->exec();
    delete login;
    return r;
}

void Core::appExit() // connected to qapplication aboutToQuit
{
    qDebug() << "Core::appExit called";
}

void Core::preInit()  // called after getAuth im main.cpp
{
    qDebug() << "Core::preInit called";
}

void Core::appMenuTriggered( QAction *action )
{
    qDebug() << "action triggered";
}

void Core::appInit()
{
    mwnd = new MainWindow();
    mwnd->show();
    qDebug() << "Core::appInit called";
}

I'm trying to connect mainwindow menubar signal to core slot like this:

connect(mwnd->menuBar(), SIGNAL(triggered()), this, SLOT(appMenuTriggered()));

But it doesn't work. Im new to c++ and Qt. How to connect this? Or maybe there is better way to handle mainwindow actions to other programm parts.

UPD Problem solved. Forget to include QMenuBar

Answer 1

You have to give the full function spec in the SIGNAL and SLOT parameters (but without the argument names). Like this:

connect(mwnd->menuBar(),
        SIGNAL(triggered(QAction*)),
        this,
        SLOT(appMenuTriggered(QAction*)));

If you debug such code in Qt Creator, the connect function will write diagnostic error messages to the Application Output pane when it doesn't find a signal or a slot. I suggest that you find these error messages before you fix your problem, so that you know where to look in future. It's very easy to get signals and slots wrong!