菜单条 Menu Bar Action

//.h

    /***Action**/
    QAction * act_openImage;
    QAction * act_openVideo;
    QAction * act_openAudio;

    /***Menu***/
    QMenu * menu_Image;
    QMenu * menu_Video;
    QMenu * menu_Audio;

private:

   void createActions();

    void createMenus();

public slots:

    void slotOpenImage();

    void slotOpenVideo();

    void slotOpenAudio();

//.cpp

void MainWindow::createActions()
{
    act_openImage = new QAction(QIcon(":/main/res/图片.png"),tr("图片"),this);
    act_openVideo = new QAction(QIcon(":/main/res/视频.png"),tr("视频"),this);
    act_openAudio = new QAction(QIcon(":/main/res/音乐.png"),tr("音乐"),this);

    connect(act_openImage,SIGNAL(triggered(bool)),this,SLOT(slotOpenImage()));
    connect(act_openVideo,SIGNAL(triggered(bool)),this,SLOT(slotOpenVideo()));
    connect(act_openAudio,SIGNAL(triggered(bool)),this,SLOT(slotOpenAudio()));
}

void MainWindow::createMenus()
{
    menu_Image = menuBar()->addMenu(tr("图片"));
                //MenuBar()返回 menu bar for the main window
                //addMenu() Append menu to the menu bar
    menu_Image->addAction(act_openImage);

    menu_Video = menuBar()->addMenu(tr("视频"));
    menu_Video->addAction(act_openVideo);

    menu_Audio = menuBar()->addMenu(tr("音频"));
    menu_Audio->addAction(act_openAudio);

}