Qt托盘程序

使用QSystemTrayIcon类可以实现托盘程序。在这里使用QMainWindow做实例：

mainwindow.h头文件

 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>
 #include <QSystemTrayIcon>
 #include <QAction>
 #include <QMenu>
 #include <QCloseEvent>

 namespace Ui {
 class MainWindow;
 }

 class MainWindow : public QMainWindow
 {
     Q_OBJECT
 public:
     explicit MainWindow(QWidget *parent = );
     ~MainWindow();

 private:
     void closeEvent(QCloseEvent * event);

 private:
     Ui::MainWindow *ui;

     QSystemTrayIcon* systemIcon; //系统托盘
     QAction* min; //最小化
     QAction* max; //最大化
     QAction* restore; //还原程序
     QAction* quit; //退出程序
     QMenu*   menu; //托盘程序的右键目录
 };

 #endif // MAINWINDOW_H

mainwindow.cpp 源文件

 #include <QString>
 #include "mainwindow.h"
 #include "ui_mainwindow.h"

 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
     ui(new Ui::MainWindow)
 {
     ui->setupUi(this);

     QIcon icon(":/new/prefix1/images/icon.ico");
     systemIcon = new QSystemTrayIcon(this); //托盘程序
     systemIcon->setIcon(icon);
     systemIcon->setToolTip(QString::fromLocal8Bit("测试托盘程序"));

     //连接托盘菜单功能到槽函数
     min = new QAction(QString::fromLocal8Bit("最小化窗口"), this);
     connect(min, SIGNAL(triggered()), this, SLOT(hide()));
     max = new QAction(QString::fromLocal8Bit("最大化窗口"), this);
     connect(max, SIGNAL(triggered()), this, SLOT(showMaximized()));
     restore = new QAction(QString::fromLocal8Bit("还原窗口"), this);
     connect(restore, SIGNAL(triggered()), this, SLOT(showNormal()));
     quit = new QAction(QString::fromLocal8Bit("退出"), this);
     connect(quit, SIGNAL(triggered()), qApp, SLOT(quit()));

     menu = new QMenu(this);
     menu->addAction(min);
     menu->addAction(max);
     menu->addAction(restore);
     menu->addSeparator();
     menu->addAction(quit);
     systemIcon->setContextMenu(menu);  //设置托盘程序功能菜单
     systemIcon->show();
 }

 MainWindow::~MainWindow()
 {
     delete ui;
 }

 void MainWindow::closeEvent(QCloseEvent *event)
 {
     if(systemIcon->isVisible())
     {
         hide(); //隐藏主程序
         systemIcon->showMessage(QString::fromLocal8Bit("提示"), QString::fromLocal8Bit("测试程序正在后台运行!"));
         event->ignore();
     }
 }