Bar menu en c++

je fait le téléchargement de qt creator mais je ne sais pas comment je fait une bar de menu svp ???

sdiwindow.h

#ifndef SDIWINDOW_H
#define SDIWINDOW_H

#include <QMainWindow>

class QAction;
class QTextEdit;

class SdiWindow : public QMainWindow
{
  Q_OBJECT
  
public:
  SdiWindow( QWidget *parent = 0 );
  
protected:
  void closeEvent( QCloseEvent *event );
  
private slots:
  void fileNew();
  void helpAbout();
  
  void fileOpen();
  bool fileSave();
  bool fileSaveAs();

private:
  void createActions();
  void createMenus();
  void createToolbars();

  bool isSafeToClose();

  bool saveFile( QString filename );
  void loadFile( QString filename );
  QString currentFilename;

  QTextEdit *docWidget;
  
  QAction *newAction;
  QAction *openAction;
  QAction *saveAction;
  QAction *saveAsAction;
  QAction *closeAction;
  QAction *exitAction;
  
  QAction *cutAction;
  QAction *copyAction;
  QAction *pasteAction;
  
  QAction *aboutAction;
  QAction *aboutQtAction;
};
  
#endif // SDIWINDOW_H

   
    
  

sdiwindow.cpp

#include <QApplication>
#include <QMenuBar>
#include <QToolBar>
#include <QStatusBar>
#include <QCloseEvent>
#include <QMessageBox>

#include <QTextEdit>

#include <QFile>
#include <QTextStream>
#include <QFileDialog>

#include "sdiwindow.h"

SdiWindow::SdiWindow( QWidget *parent ) : QMainWindow( parent )
{
  setAttribute( Qt::WA_DeleteOnClose );
  setWindowTitle( tr("%1[*] - %2" ).arg(tr("unnamed")).arg(tr("SDI")) );

  docWidget = new QTextEdit( this );
  setCentralWidget( docWidget );

  connect( docWidget->document(), SIGNAL(modificationChanged(bool)), this, SLOT(setWindowModified(bool)) );

  createActions();
  createMenus();
  createToolbars();
  statusBar()->showMessage( tr("Done") );
}

void SdiWindow::closeEvent( QCloseEvent *event )
{
  if( isSafeToClose() )
    event->accept();
  else
    event->ignore();
}

void SdiWindow::fileNew()
{
  (new SdiWindow())->show();
}

void SdiWindow::helpAbout()
{
  QMessageBox::about( this, tr("About SDI"), tr("A single document interface application.") );
}

void SdiWindow::createActions()
{
  newAction = new QAction( QIcon(":/images/new.png"), tr("&New"), this );
  newAction->setShortcut( tr("Ctrl+N") );
  newAction->setStatusTip( tr("Create a new document") );
  connect( newAction, SIGNAL(triggered()), this, SLOT(fileNew()) );

  openAction = new QAction( tr("&Open"), this );
  openAction->setShortcut( tr("Ctrl+O") );
  openAction->setStatusTip( tr("Open a document") );
  connect( openAction, SIGNAL(triggered()), this, SLOT(fileOpen()) );

  saveAction = new QAction( tr("&Save"), this );
  saveAction->setShortcut( tr("Ctrl+S") );
  saveAction->setStatusTip( tr("Save the document") );
  connect( saveAction, SIGNAL(triggered()), this, SLOT(fileSave()) );

  saveAsAction = new QAction( tr("Save &As"), this );
  saveAsAction->setStatusTip( tr("Save the document as") );
  connect( saveAsAction, SIGNAL(triggered()), this, SLOT(fileSaveAs()) );

  closeAction = new QAction( tr("&Close"), this );
  closeAction->setShortcut( tr("Ctrl+W") );
  closeAction->setStatusTip( tr("Close this document") );
  connect( closeAction, SIGNAL(triggered()), this, SLOT(close()) );

  exitAction = new QAction( tr("E&xit"), this );
  exitAction->setShortcut( tr("Ctrl+Q") );
  exitAction->setStatusTip( tr("Quit the application") );
  connect( exitAction, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()) );


  cutAction = new QAction( QIcon(":/images/cut.png"), tr("Cu&t"), this );
  cutAction->setShortcut( tr("Ctrl+X") );
  cutAction->setStatusTip( tr("Cut") );
  cutAction->setEnabled(false);
  connect( docWidget, SIGNAL(copyAvailable(bool)), cutAction, SLOT(setEnabled(bool)) );
  connect( cutAction, SIGNAL(triggered()), docWidget, SLOT(cut()) );

  copyAction = new QAction( QIcon(":/images/copy.png"), tr("&Copy"), this );
  copyAction->setShortcut( tr("Ctrl+C") );
  copyAction->setStatusTip( tr("Copy") );
  copyAction->setEnabled(false);
  connect( docWidget, SIGNAL(copyAvailable(bool)), copyAction, SLOT(setEnabled(bool)) );
  connect( copyAction, SIGNAL(triggered()), docWidget, SLOT(copy()) );


  pasteAction = new QAction( QIcon(":/images/paste.png"), tr("&Paste"), this );
  pasteAction->setShortcut( tr("Ctrl+V") );
  pasteAction->setStatusTip( tr("Paste") );
  connect( pasteAction, SIGNAL(triggered()), docWidget, SLOT(paste()) );


  aboutAction = new QAction( tr("&About"), this );
  aboutAction->setStatusTip( tr("About this application") );
  connect( aboutAction, SIGNAL(triggered()), this, SLOT(helpAbout()) );

  aboutQtAction = new QAction( tr("About &Qt"), this );
  aboutQtAction->setStatusTip( tr("About the Qt toolkit") );
  connect( aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()) );
}

void SdiWindow::createMenus()
{
  QMenu *menu;

  menu = menuBar()->addMenu( tr("&File") );
  menu->addAction( newAction );
  menu->addSeparator();
  menu->addAction( openAction );
  menu->addAction( saveAction );
  menu->addAction( saveAsAction );
  menu->addSeparator();
  menu->addAction( closeAction );
  menu->addSeparator();
  menu->addAction( exitAction );

  menu = menuBar()->addMenu( tr("&Edit") );
  menu->addAction( cutAction );
  menu->addAction( copyAction );
  menu->addAction( pasteAction );

  menu = menuBar()->addMenu( tr("&Help") );
  menu->addAction( aboutAction );
  menu->addAction( aboutQtAction );
}

void SdiWindow::createToolbars()
{
  QToolBar *toolbar;

  toolbar = addToolBar( tr("File") );
  toolbar->addAction( newAction );

  toolbar = addToolBar( tr("Edit") );
  toolbar->addAction( cutAction );
  toolbar->addAction( copyAction );
  toolbar->addAction( pasteAction );
}



bool SdiWindow::isSafeToClose()
{
  if( isWindowModified() )
  {
    switch( QMessageBox::warning( this, tr("SDI"),
      tr("The document has unsaved changes.\n"
         "Do you want to save it before it is closed?"),
          QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel ) )
    {
    case QMessageBox::Cancel:
      return false;
    case QMessageBox::Save:
      return fileSave();
    default:
      return true;
    }
  }

  return true;
}

void SdiWindow::fileOpen()
{
  QString filename = QFileDialog::getOpenFileName( this );
  if( filename.isEmpty() )
    return;

  if( currentFilename.isEmpty() && !docWidget->document()->isModified() )
    loadFile( filename );
  else
  {
    SdiWindow *window = new SdiWindow();
    window->loadFile( filename );
    window->show();
  }
}

bool SdiWindow::fileSave()
{
  if( currentFilename.isEmpty() )
    return fileSaveAs();
  else
    return saveFile( currentFilename );
}

bool SdiWindow::fileSaveAs()
{
  QString filename = QFileDialog::getSaveFileName( this, tr("Save As"), currentFilename );
  if( filename.isEmpty() )
    return false;

  return saveFile( filename );
}

bool SdiWindow::saveFile( QString filename )
{
  QFile file( filename );
  if( !file.open( QIODevice::WriteOnly | QIODevice::Text ) )
  {
    QMessageBox::warning( this, tr("SDI"), tr("Failed to save file.") );
    return false;
  }

  QTextStream stream( &file );
  stream << docWidget->toPlainText();

  currentFilename = filename;
  docWidget->document()->setModified( false );
  setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) );

  return true;
}

void SdiWindow::loadFile( QString filename )
{
  QFile file( filename );
  if( !file.open( QIODevice::ReadOnly | QIODevice::Text ) )
  {
    QMessageBox::warning( this, tr("SDI"), tr("Failed to open file.") );
    return;
  }

  QTextStream stream( &file );
  docWidget->setPlainText( stream.readAll() );

  currentFilename = filename;
  docWidget->document()->setModified( false );
  setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) );
}

et pour le main
<code>#include <QApplication>

#include "sdiwindow.h"

int main( int argc, char **argv )
{
QApplication app( argc, argv );

(new SdiWindow)->show();
QObject::connect( &app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()) );

return app.exec();
}
<\code>

mais ca ne marche pas svp aide moi