QT时间触发电子时钟

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    QTimer *timer = new QTimer(this);

    connect(timer,SIGNAL(timeout()),this,SLOT(showTime()));

    timer->start(500);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::showTime()

{

    QTime time = QTime::currentTime();

    QString txtTime = time.toString("hh:mm:ss");

    ui->lcdNumber->display(txtTime);

    qDebug()<<txtTime;

    QDateTime now = QDateTime::currentDateTime();

    QDateTime xmas(QDate(now.date().year(), 11, 29), QTime(0, 0));

    qDebug("There are %d days to Christmas", now.daysTo(xmas));

}