参考：
Qt系统托盘程序的实现_qt托盘程序-CSDN博客
QT系统托盘应用程序-CSDN博客
代码：
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QSystemTrayIcon>
#include <QDebug>
#include <QMenu>
#include <QCloseEvent>
namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();
public slots:void showWindow();void on_exitAppAction();void iconActivated(QSystemTrayIcon::ActivationReason reason);
protected:void closeEvent(QCloseEvent *event);
private:Ui::Widget *ui;QSystemTrayIcon *sysTray;//打开工具//安全退出QAction *open;QAction *exit;QMenu *contextMenu;
};#endif // WIDGET_H
#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);sysTray=new QSystemTrayIcon(this);sysTray->setIcon(QIcon(QApplication::applicationDirPath()+"/icon.ico"));//qDebug()<<QApplication::applicationDirPath()+"/icon.ico";open=new QAction("打开工具",this);exit=new QAction("安全退出",this);connect(open,&QAction::triggered,this,&Widget::showWindow);connect(exit,&QAction::triggered,this,&Widget::on_exitAppAction);connect(sysTray,&QSystemTrayIcon::activated,this,&Widget::iconActivated);contextMenu=new QMenu(this);contextMenu->addAction(open);contextMenu->addAction(exit);sysTray->setContextMenu(contextMenu);sysTray->show();this->hide();
}Widget::~Widget()
{delete ui;
}void Widget::showWindow()
{show();raise();
}void Widget::on_exitAppAction()
{qApp->exit();
}void Widget::iconActivated(QSystemTrayIcon::ActivationReason reason)
{switch (reason) {case QSystemTrayIcon::Trigger:showWindow();break;default:break;}
}void Widget::closeEvent(QCloseEvent *event)
{this->hide();event->ignore();
}
#include "widget.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();return a.exec();
}
)