Qt编写秒表功能 Qt编写秒表功能

本文实例为大家分享了Qt编写秒表的具体实现代码，供大家参考，具体内容如下
文件widget.h

#ifndef WIDGET_H#define WIDGET_H#include#include #include#includenamespace Ui {class Widget; } class Widget : public QWidget{Q_OBJECT public:explicit Widget(QWidget *parent = 0); ~Widget(); private slots:void on_startButton_clicked(); void updatesolt(); void on_stopButton_clicked(); private:Ui::Widget *ui; int num ; QTimer *timer; }; #endif // WIDGET_H

【Qt编写秒表功能】main.cpp

#include "widget.h"#include int main(int argc, char *argv[]){QApplication a(argc, argv); Widget w; w.show(); return a.exec(); }

widget.cpp

#include "widget.h"#include "ui_widget.h"#include#includeWidget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget){ui->setupUi(this); num =0; // ui->lineEdit->setText(QString::number(num)); ui->lcdNumber->setDigitCount(8); QTime time; time.setHMS(0,0,0); ui->lcdNumber->display(time.toString("hh:mm:ss")); //这个this是为了指定父对象，//只要指定了父对象，那么在堆区申请的空间，会在释放父对象的时候，会自动释放timer = new QTimer(this); //只要设定的时间到，timer 就会产生一个timeout的信号，而且是循环产生connect(timer,SIGNAL(timeout()),this,SLOT(updatesolt())); } Widget::~Widget(){delete ui; } void Widget::on_startButton_clicked(){//启动定时器单位是毫秒timer->start(10); }void Widget::updatesolt(){num++; QTime time(0,0,0); QTime t = time.addSecs(num); ui->lcdNumber->display(t.toString("hh:mm:ss")); } void Widget::on_stopButton_clicked(){timer->stop(); }

UI界面如下：