#QT（QT时钟）

1.IDE：QTCreator

2.实验

3.记录

qtime（qt的时间类）

qtimer（qt的定时类）

4.代码

widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QTime>          //
#include <QTimer>         //
#include <QDebug>
QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTQTime time;           //QTimer timer;         //
public:Widget(QWidget *parent = nullptr);~Widget();private slots:void on_start_pb_clicked();void timeout_slot();void on_stop_pb_clicked();void on_reset_pb_clicked();void on_dadian_pb_clicked();private:Ui::Widget *ui;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"static int i;Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);connect(&timer,SIGNAL(timeout()),this,SLOT(timeout_slot()));time.setHMS(0,0,0,0);    //设置时间0时0分0秒0毫秒ui->show_time->setText("00:00:00:000");  //初始化显示
}Widget::~Widget()
{delete ui;
}void Widget::on_start_pb_clicked()        //开始按钮按下时
{timer.start(10);       //定时10ms
}void Widget::timeout_slot()  //定时到达处理函数
{// qDebug("1s");time=time.addMSecs(10);ui->show_time->setText(time.toString("hh:mm:ss.zzz"));
}void Widget::on_stop_pb_clicked()  //停止按钮按下时
{timer.stop();     //停止定时器
}void Widget::on_reset_pb_clicked()    //重置按钮按下时
{timer.stop();     //停止定时器time.setHMS(0,0,0,0);    //设置时间0时0分0秒0毫秒ui->show_time->setText("00:00:00:000");  //初始化显示i=0;              //排名计数器清0
}void Widget::on_dadian_pb_clicked()  //打点按钮按下时
{QString temp;i=i+1;temp.setNum(i);ui->keep_dadian->append(temp);ui->keep_dadian->append(time.toString("hh:mm:ss.zzz"));    //记下打点的时间
}