QThread

#ifndef MYTHREAD_H

#define MYTHREAD_H

#include<QThread>

class MyThread : public QThread

{

    Q_OBJECT

public:

    explicit MyThread(QObject *parent = 0);

    void run();

    bool Stop;

signals:

    void NumberChanged(int);

public slots:

};

#endif // MYTHREAD_H

　　

#ifndef DIALOG_H

#define DIALOG_H

#include "mythread.h"

#include <QDialog>

#include<QLabel>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

public:

    explicit Dialog(QWidget *parent = 0);

    ~Dialog();

    MyThread *mThread;

private:

    Ui::Dialog *ui;

public slots:

    void  onNumberChanged(int);

private slots:

    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

};

#endif // DIALOG_H

　　

#include "dialog.h"

#include "ui_dialog.h"

#include<QLabel>

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

    mThread = new MyThread(this);

    connect(mThread,SIGNAL(NumberChanged(int)),this, SLOT(onNumberChanged(int)));

}

Dialog::~Dialog()

{

    delete ui;

}

void Dialog::onNumberChanged(int Number)

{

    ui->label->setText(QString::number(Number));

}

void Dialog::on_pushButton_clicked()

{

    //started

    mThread->start();

}

void Dialog::on_pushButton_2_clicked()

{

    mThread->Stop = true;

}

　　

#include "dialog.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Dialog w;

    w.show();

    return a.exec();

}

　　

#include "mythread.h"

#include <QThread>

MyThread::MyThread(QObject *parent) : QThread(parent)

{

}

void MyThread::run()

{

    this->Stop = false;

    for(int i = 0; i < 10000;i++)

    {

        QMutex mutex;

        mutex.lock();

        if(this->Stop) break;

        mutex.unlock();

        emit NumberChanged(i);

        this->msleep(1000);

    }

}