/*main.cpp*/
#include <QApplication>
#include <QTextCodec>
#include "digitalclock.h"int main(int argc, char *argv[])
{QApplication app(argc, argv);//显示本地化，解决中文乱码.QTextCodec::setCodecForTr(QTextCodec::codecForLocale());DigitalClock clock;clock.show();return app.exec();
}

#ifndef DIGITALCLOCK_H
#define DIGITALCLOCK_H#include <QLCDNumber>class DigitalClock : public QLCDNumber
{Q_OBJECTpublic:DigitalClock(QWidget *parent = 0);private slots:void showTime();
};#endif

#include <QtGui>#include "digitalclock.h"DigitalClock::DigitalClock(QWidget *parent): QLCDNumber(parent)
{//setSegmentStyle(Filled);//setSegmentStyle(Outline);setNumDigits(8);QTimer *timer = new QTimer(this);connect(timer, SIGNAL(timeout()), this, SLOT(showTime()));timer->start(1000);showTime();//设置窗口标题setWindowTitle(tr("数字时钟"));resize(200, 60);
}void DigitalClock::showTime()
{QTime time = QTime::currentTime();QString text = time.toString("hh:mm:ss");if ((time.second() % 2) == 0)text[2] = ' ';display(text);
}