qt添加菜单和工具条

mainwindow.h文件如下：

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include<QAction>

namespace Ui {
  
  

class MainWindow;

}

class MainWindow : public QMainWindow

{
  
  

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    QAction *openAction;

private:

    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

mainwindow.cpp 文件如下

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include<QMenu>

#include<QToolBar>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{
  
  

    //ui->setupUi(this);

    openAction =new QAction(tr("&打开"),this);

    openAction->setShortcut(QKeySequence::Open);

    openAction->setStatusTip(tr("Open a file."));

    QMenu *menu= menuBar()->addMenu(tr("&文件"));

    menu->addAction(openAction);

    QToolBar *tool = addToolBar(tr("&文件"));

    tool->addAction(openAction);

}

MainWindow::~MainWindow()

{
  
  

    delete ui;

}

结果如下：