调试信息输出窗口可以查看超时误差

dialog.h文件

#ifndef DIALOG_H

#define DIALOG_H

#include

#include

namespace Ui {

class Dialog;

}

class QTimer;

class Dialog : public QDialog

{

Q_OBJECT

public:

explicit Dialog(QWidget *parent = 0);

~Dialog();

public slots:

void slotOneSec();

private:

Ui::Dialog *ui;

QDateTime m_time;

QTimer *m_oneSecTimer;

int num;

};

#endif // DIALOG_H

dialog.cpp文件

#include "dialog.h"

#include "ui_dialog.h"

#include

#include

Dialog::Dialog(QWidget *parent) :

QDialog(parent),

ui(new Ui::Dialog)

{

ui->setupUi(this);

num = 0;

m_oneSecTimer = new QTimer();

connect(m_oneSecTimer, SIGNAL(timeout()), this, SLOT(slotOneSec()));

m_time = QDateTime::currentDateTime();

m_oneSecTimer->start(1000);

ui->myTime->setText(m_time.toString("hh:mm:ss"));

ui->computerTime->setText(QDateTime::currentDateTime().toString("hh:mm:ss"));

}

Dialog::~Dialog()

{

delete m_oneSecTimer;

delete ui;

}

void Dialog::slotOneSec()

{

m_time = m_time.addSecs(1);

ui->myTime->setText(m_time.toString("hh:mm:ss"));

ui->computerTime->setText(QDateTime::currentDateTime().toString("hh:mm:ss"));

//如果两次定时间隔大于10秒，次数就会+1

qDebug()<

if(abs(m_time.toMSecsSinceEpoch() - QDateTime::currentDateTime().toMSecsSinceEpoch()) > 10000)

{

num++;

}

ui->exception->setText(QString::number(num));

//校准事件

m_time = QDateTime::currentDateTime();

}

效果图