How to use qAction submenu in Qt - qt

Question

I want to implement simple commands like a qDebug() when I click on a sub menu in the mainwindow. I was referring to sample program given along with the Qt 5 IDE (...\Qt\Qt5.2.0\5.2.0\msvc2010\examples\widgets\mainwindows\menus), and using it, I managed to construct the code. I do not receive any compile time or run time errors.
I created the mainwindow.ui using the design mode. It has an object of the QAction class called actionInterval.
But when I click on it, nothing happens, I am not able to implement the command in void interval(). I guess I am not connecting properly. What am I missing here? Please advise.
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QDebug>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
void createActions();
private slots:
void interval();
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
createActions();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::createActions()
{
ui->actionInterval = new QAction(tr("&Interval"), this);
ui->actionInterval->setStatusTip(tr("Set the interval for capturing delta & reference images"));
connect(ui->actionInterval, SIGNAL(triggered()), this, SLOT(interval()));
}
void MainWindow::interval()
{
qDebug()<<"inside interval qdialog";
}
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}

Answer 1

void MainWindow::createActions()
{
ui->actionInterval->setStatusTip(tr("Set the interval for capturing delta & reference images"));
connect(ui->actionInterval, SIGNAL(triggered()), this, SLOT(interval()));
}
You shouldn't need that ui->actionInterval = new QAction(tr("&Interval"), this); line, the ui->setupUi() handles that for you, so it's potentially causing an incorrect reference so when you do click on it it's not firing correctly.