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主程序

#include <QCoreApplication>
#include "mainwindow.h"int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);MainWindow w;return a.exec();
}

mainwindow.cpp程序

#include "mainwindow.h"#include <QDateTime>MainWindow::MainWindow(QObject *parent):QObject(parent)
{pTimer = new QTimer(this);pTimer->setInterval(10000);connect(pTimer, &QTimer::timeout, this, &MainWindow::slot10000msTimeOut);pTimer->start();qDebug() << "Start constructing MainWindow at:" << QDateTime::currentDateTime();if (pTimer->isActive()) {qDebug() << "Timer started successfully.";} else {qDebug() << "Timer failed to start.";}
}
MainWindow::~MainWindow()
{if(pTimer->isActive()){pTimer->stop();}
}void MainWindow::slot10000msTimeOut()
{qDebug() << "End constructing MainWindow at:" << QDateTime::currentDateTime();
}

mainwindow.h头文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QTimer>
#include <QDebug>
class MainWindow : public QObject
{Q_OBJECTpublic:MainWindow(QObject *parent = nullptr);~MainWindow();private:QTimer *pTimer;private slots:void slot10000msTimeOut();
};
#endif // MAINWINDOW_H

总结了注意点：

关闭定时器，在程序结束的时候，再stop

声明了槽函数，是必须要去定义的。否则报错

QCoreApplication不依赖于任何 GUI 相关的库和功能