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 = 0);
    ~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();
    }
}