qt 定时器怎么实现每天定时

#########在qt怎么使用定时器可以实现每天定时八点执行任务？

1. 创建QTimer对象：

   QTimer *timer = new QTimer(this);
   

2. 设置定时器的超时时间：

   QDateTime now = QDateTime::currentDateTime();
   QDateTime eight = now.addSecs(86400); // 86400 secs = 24 hours
   timer->start(eight.toTime_t() - now.toTime_t());
   

3. 连接定时器的timeout()信号到槽：
   c connect(timer, SIGNAL(timeout()), this, SLOT(doTask()));c
4. 实现doTask()槽：

   void doTask()
   {
    // 执行任务
   }
   

#include <QtCore>

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

    QTimer *timer = new QTimer(&app);

    QDateTime now = QDateTime::currentDateTime();
    QDateTime nextTime = QDateTime(now.date(), QTime(8, 0));
    if (now > nextTime)
        nextTime = nextTime.addDays(1);

    qint64 interval = now.msecsTo(nextTime);
    timer->setInterval(interval);
    timer->setSingleShot(true);
    QObject::connect(timer, &QTimer::timeout, [](){
        //任务代码
    });
    timer->start();

    return app.exec();
}