QT ------计时器

CLOCK.H SOURCE CODE:

#ifndef CLOCK_H

#define CLOCK_H

#include <QMainWindow>

#include <QTimer>

#include <stdlib.h>

#include <QMessageBox>

#include <QDebug>

#include <QString>

#include <QObject>

#include <QTimerEvent>

namespace Ui {

class CLOCK;

class CLOCK : public QMainWindow

    Q_OBJECT

public:

    explicit CLOCK(QWidget *parent = 0);

    ~CLOCK();

private:

    Ui::CLOCK *ui;

    int secondnumber;

    QTimer *m_timer=new QTimer(this);

    int m_nTimerID;

private slots:

    void ClcokShutdown();

    void ShowSetTimer();

    void timernumber();

};

#endif // CLOCK_H

CLOCK SOURCE CODE:

#include "clock.h"

#include "ui_clock.h"

CLOCK::CLOCK(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::CLOCK)

    ui->setupUi(this);

    //system("shutdown -s -t 7200");

    //QTimer *timer=new QTimer(this);//创建时钟

    //timer->start(1000*1);

    //QObject::connect(timer,SIGNAL(timeout()),this,SLOT(close()));//设置启动时钟函数

    QObject::connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(ShowSetTimer()));//启动单击事件

CLOCK::~CLOCK()

    delete ui;

void CLOCK::ClcokShutdown()

    system("shutdown -s -t 0");

void CLOCK::timernumber()

    if(this->secondnumber>=0)

        QString Temp;

        Temp=QString::number(this->secondnumber);

        ui->label_3->setText(Temp+".秒");

        this->secondnumber--;

    else

        QMessageBox::information(this,"system Message","计时完成！！");

        m_timer->stop();//停止记数

void CLOCK::ShowSetTimer()

    if(!ui->lineEdit->text().isEmpty())

        secondnumber=ui->lineEdit->text().toInt();

        m_nTimerID=secondnumber;

        ui->lineEdit->setEnabled(false);

        QObject::killTimer(m_nTimerID*1000);

        QObject::connect(m_timer,SIGNAL(timeout()),this,SLOT(timernumber()));

        m_timer->start(1000);

    else

        QMessageBox::information(this,"系统提示","请先设置关机时间!!");

MAIN.CPP SOURCE CODE:

#include "clock.h"

#include <QApplication>

int main(int argc, char *argv[])

    QApplication a(argc, argv);

    CLOCK w;

    w.setMaximumSize(288,213);

    w.setMinimumSize(288,213);

    w.show();

    return a.exec();