定时器之QTimer

小灰灰 2022-08-07 02:40 170阅读 0赞

转自：http://www.linuxidc.com/Linux/2011-10/45832p2.htm

//mydialog.h  
\#ifndef MYDIALOG\_H  
\#define MYDIALOG\_H  
\#include <QDialog>  
class QLCDNumber;  
class QTimer;  
class MyDialog : public QDialog  
\{  
Q\_OBJECT  
public:  
explicit MyDialog(QWidget \*parent = 0);  
signals:  
public slots:  
void onTimerOut();  
private:  
QLCDNumber \*lcd;  
QTimer \*timer;  
\};  
\#endif // MYDIALOG\_H

//mydialog.cpp  
\#include "mydialog.h"  
\#include <QtGui/QLCDNumber>  
\#include <QtGui/QVBoxLayout>  
\#include <QTimer>  
\#include <QTime>  
MyDialog::MyDialog(QWidget \*parent) :  
QDialog(parent)  
\{  
//新建一个QLCDNumber对象  
lcd = new QLCDNumber();  
//设置晶体管控件QLCDNumber能显示的位数  
lcd->setDigitCount(10);  
//设置显示的模式为十进制  
lcd->setMode(QLCDNumber::Dec);  
//设置显示方式  
lcd->setSegmentStyle(QLCDNumber::Flat);  
  
//新建一个QTimer对象  
timer = new QTimer();  
//设置定时器每个多少毫秒发送一个timeout()信号  
timer->setInterval(1000);  
//启动定时器  
timer->start();  
  
QVBoxLayout \*layout = new QVBoxLayout();  
layout->addWidget(lcd);  
//信号和槽  
connect(timer, SIGNAL(timeout()), this, SLOT(onTimerOut()));  
  
//重新设置窗口的布局管理器  
this->setLayout(layout);  
//重新设置窗口的大小  
this->resize(200, 100);  
//重新设置窗口的标题  
this->setWindowTitle("QTimerDemo");  
\}  
  
void MyDialog::onTimerOut()  
\{  
//获取系统当前时间  
QTime time = QTime::currentTime();  
//设置晶体管控件QLCDNumber上显示的内容  
lcd->display(time.toString("hh:mm:ss"));  
\}  
  
//main.cpp  
\#include <QtGui/QApplication>  
\#include "mydialog.h"  
int main(int argc, char \*argv\[\])  
\{  
QApplication a(argc, argv);  
MyDialog dialog;  
dialog.show();  
return a.exec();  
\}

=======运行效果如下============

![1340609998_4689.png][]

[1340609998_4689.png]: https://img-my.csdn.net/uploads/201206/25/1340609998_4689.png