QT学习笔记-数据类型

QT编程QString与int类型转换

字符串转整型

int num;

num=a.toInt(str)

整型转字符串

QString str;
str=QString::number(num)

QT编程QTimer定时器代码

#ifndef MYTIME_H

#define MYTIME_H

#include <QTimer>

#include <QObject>

class MyTime : public QObject

{

    Q_OBJECT

public:

    MyTime(QObject *parent = NULL );

    ~MyTime();

signals:

public slots:

     void handleTimeout();

private:

    QTimer *m_pTimer;

};

#endif // MYTIME_H

#include "mytime.h"

#include <QTimer>

#include <QDebug>

#define TIMER_TIMEOUT 5000

MyTime::MyTime(QObject *parent) : QObject(parent)

{

    m_pTimer = new QTimer(this);

    connect(m_pTimer, SIGNAL(timeout()), this, SLOT(handleTimeout()));

    m_pTimer->start(TIMER_TIMEOUT);

}

MyTime::~MyTime()

{

}

void MyTime::handleTimeout()

{

    qDebug()<<"Enter timeout processing function\n";

    if(m_pTimer->isActive())

    {

        m_pTimer->stop();

    }

}