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);
    }
}