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For the purpose of using QThread class, you have to include <QThread>

and also wanna communicate with main UI, mainwindow.h should be added.


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shownumber.h

#ifndef SHOWNUMBER_H
#define SHOWNUMBER_H
 
#include <QMainWindow>
#include <QThread>
#include <mainwindow.h>
 
class ShowNumber:public QThread
{
    Q_OBJECT
public:
    ShowNumber(MainWindow *gui);
    ~ShowNumber();
    // to override run method
    void run();
 
    // is the job running
    bool running;
    int counter;
 
       // in order to notify subscribers (mainwindow)
   signals:
       void signalUpdateUI();
 
       // callback function
   public slots:
       void slotUpdateUI();
 
   public:
       MainWindow *m_gui;
 
};
 
#endif // SHOWNUMBER_H


shownumber.cpp

#include "shownumber.h"
 
ShowNumber::ShowNumber(MainWindow *gui)
{
    running =true;
    this->m_gui = gui;
    connect(this, SIGNAL(showNum()), this, SLOT(slotUpdateUI()));
}
 
ShowNumber::~ShowNumber()
{
 
}
 
void ShowNumber::run()
{
    while(running)
    {
        counter++;
        emit signalUpdateUI();
        msleep(1);
 
    }
}
 
void ShowNumber::slotUpdateUI()
{
    m_gui->shownumberDisp();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
 
 
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
 
 
 
private:
    Ui::MainWindow *ui;
 
 
 
public:
    void shownumberDisp();
public slots:
    void shownumberStart();
    void shownumberStop();
private slots:
    void on_pushButton_clicked();
    void on_pushButton_2_clicked();
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "shownumber.h"
 
ShowNumber::ShowNumber(MainWindow *gui)
{
    running =true;
    this->m_gui = gui;
    connect(this, SIGNAL(signalUpdateUI()), this, SLOT(slotUpdateUI()));
}
 
ShowNumber::~ShowNumber()
{
 
}
 
void ShowNumber::run()
{
    while(running)
    {
        counter++;
        emit signalUpdateUI();
        msleep(1);
 
    }
}
 
void ShowNumber::slotUpdateUI()
{
    m_gui->shownumberDisp();
}


mainwindow.ui


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References


1. Qt子執行緒如何更新UI,完整的程式碼示例,有圖有真相

2. How to Create Threads in Linux (With a C Example Program)

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