Menu bar not appearing

[GUIman]

Just started using Qt and am wondering why the menu bar doesn't show up, when I run the app. Thank you in advance for helping... Here is the code

mainwindow.h

#ifndef LINES_H
#define LINES_H
 
#include <QWidget>
#include <qmainwindow.h>
#include <QMainWindow>
 
class QMenu;
class QAction;
class QLabel;
 
class Lines : public QMainWindow
{
  Q_OBJECT
 
  public:
    Lines();
 
  private:
    void createActions();
    void updateActions();
    void createMenus();
    QMenu *fileMenu;
    //QMenu *moveMenu;
    QAction *exitAct;
 
  protected:
    void paintEvent(QPaintEvent *event);
};
 
#endif

#ifndef LINES_H
#define LINES_H

#include <QWidget>
#include <qmainwindow.h>
#include <QMainWindow>

class QMenu;
class QAction;
class QLabel;

class Lines : public QMainWindow
{
  Q_OBJECT

  public:
    Lines();

  private:
    void createActions();
    void updateActions();
    void createMenus();
    QMenu *fileMenu;
    //QMenu *moveMenu;
    QAction *exitAct;

  protected:
    void paintEvent(QPaintEvent *event);
};

#endif

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lines.cpp

#include <QtGui>
#include "mainwindow.h"
#include <QApplication>
#include <QPainter>
 
 
Lines::Lines()
{
   createActions();
   createMenus();
 
   setWindowTitle(tr("Tic Tac Toe"));
   resize(270, 270);
}
 
void Lines::paintEvent(QPaintEvent *event)
{
  QPen pen(Qt::black, 2, Qt::SolidLine);
 
  QPainter painter(this);
 
  painter.setPen(pen);
  painter.drawLine(93, 20, 93, 250);
  painter.drawLine(177, 20, 177, 250);
  painter.drawLine(20, 93, 250, 93);
  painter.drawLine(20, 177, 250, 177);
  //Draw test x
  painter.drawLine(30, 30, 80, 80);
  painter.drawLine(80, 30, 30, 80);
}
 
void Lines::createActions()
{
    exitAct = new QAction(tr("E&xit"), this);
    exitAct->setShortcut(tr("Ctrl+Q"));
    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
}
 
void Lines::createMenus()
{
    fileMenu = new QMenu(tr("&File"), this);
    fileMenu->addAction(exitAct);
}

#include <QtGui>
#include "mainwindow.h"
#include <QApplication>
#include <QPainter>


Lines::Lines()
{
   createActions();
   createMenus();

   setWindowTitle(tr("Tic Tac Toe"));
   resize(270, 270);
}

void Lines::paintEvent(QPaintEvent *event)
{
  QPen pen(Qt::black, 2, Qt::SolidLine);

  QPainter painter(this);

  painter.setPen(pen);
  painter.drawLine(93, 20, 93, 250);
  painter.drawLine(177, 20, 177, 250);
  painter.drawLine(20, 93, 250, 93);
  painter.drawLine(20, 177, 250, 177);
  //Draw test x
  painter.drawLine(30, 30, 80, 80);
  painter.drawLine(80, 30, 30, 80);
}

void Lines::createActions()
{
    exitAct = new QAction(tr("E&xit"), this);
    exitAct->setShortcut(tr("Ctrl+Q"));
    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
}

void Lines::createMenus()
{
    fileMenu = new QMenu(tr("&File"), this);
    fileMenu->addAction(exitAct);
}

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main.cpp

#include "mainwindow.h"
#include <QDesktopWidget>
#include <QApplication>
 
int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  Lines Lines;
  Lines.show();
  return app.exec();
}

#include "mainwindow.h"
#include <QDesktopWidget>
#include <QApplication>

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  Lines Lines;
  Lines.show();
  return app.exec();
}

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[ChrisW67]

QMainWindow::menuBar() and QMenuBar::addMenu()

[GUIman]

I am completely new to using the qt framework. could you please explain how I could modify my code to implement your fixes?
Thank you for putting up with me.

[BalaQT]

I am completely new to using the qt framework. could you please explain how I could modify my code to implement your fixes?
Thank you for putting up with me.

hi,
welcome to QtCentre.
As Chris said, after creating the menus
Just add ,

Lines::Lines()
{
   createActions();
   createMenus();
   menuBar()->addMenu(fileMenu);
  ...............
  ...............
}

Lines::Lines()
{
   createActions();
   createMenus();
   menuBar()->addMenu(fileMenu);
  ...............
  ...............
}

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in class Lines constructor.

hope it helps.
Bala

[ChrisW67]

I'd put it in createMenus() myself. Seems the logical place for it.

[GUIman]

Thank you so much
I got it now!