如何显示system tray icon

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

　　...

　　tabwidget_ui_demo w; // main window
　　QObject::connect(&w, SIGNAL(sigbtnQuitClicked()), &app, SLOT(quit()));
　　w.show(); // show main window

　　QSystemTrayIcon sysTray; // system tray icon
　　sysTray.setIcon(QIcon("images/favorites.png"));

　　QMenu *menu = new QMenu; // create context menu
　　QAction *actionAbout = new QAction("About QT4", 0); // create one action
　　QObject::connect(actionAbout, SIGNAL(triggered()), &app, SLOT(aboutQt()));
　　menu->addAction(actionAbout); // add the action to menu

　　QAction *actionShow = new QAction("Pop Up", 0);
　　QObject::connect(actionShow, SIGNAL(triggered()), &w, SLOT(showMaximized()));
　　menu->addAction(actionShow);

　　QAction *actionExit = new QAction("Exit", 0);
　　QObject::connect(actionExit, SIGNAL(triggered()), &app, SLOT(quit()));
　　menu->addAction(actionExit);

　　sysTray.setContextMenu(menu);
　　sysTray.show(); // show system tray

　　return app.exec();

}

运行结果如图：