signals not work

[ludoQtCreator]

Hi, I'm trying to create a signal, but I can't see the code. I'm trying to prevent reading and writing to a file at the same time with QSetting. Is there perhaps another way? Thanks.

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QtWidgets>
 
#include "parametres.h"
#include "threadsondes.h"
#include "gainable.h"
#include "affichecons.h"
 
class MainWindow: public QWidget
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = nullptr);
 
signals:
    void lectureEnCours(bool m_lecture);

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtWidgets>

#include "parametres.h"
#include "threadsondes.h"
#include "gainable.h"
#include "affichecons.h"

class MainWindow: public QWidget
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);

signals:
    void lectureEnCours(bool m_lecture);

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mainwindow.cpp

#include "mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
    :QWidget (parent)
{
connect(this, &MainWindow::lectureEnCours, &m_mainwindowThreadSondes, &ThreadSondes::onLitEnCours);
 
    m_timer1 = new QTimer(this);
    m_timer1 ->start(m_timerTemps);
    connect(m_timer1, &QTimer::timeout, this, &MainWindow::lectureTemperatures);
}
 
void MainWindow::lectureTemperatures()
{
    qDebug() << "lectureTemperature() MainWindow";
 
    emit lectureEnCours(true);
}

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    :QWidget (parent)
{
connect(this, &MainWindow::lectureEnCours, &m_mainwindowThreadSondes, &ThreadSondes::onLitEnCours);
    
    m_timer1 = new QTimer(this);
    m_timer1 ->start(m_timerTemps);
    connect(m_timer1, &QTimer::timeout, this, &MainWindow::lectureTemperatures);
}

void MainWindow::lectureTemperatures()
{
    qDebug() << "lectureTemperature() MainWindow";
    
    emit lectureEnCours(true);
}

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threadsondes.h

#ifndef THREADSONDES_H
#define THREADSONDES_H
 
#include <QThread>
 
#include <QObject>
 
#include "sondes.h"
 
class ThreadSondes: public QThread
{
	Q_OBJECT
 
public:
    ThreadSondes();
 
    bool lecture = false;
 
    void lectureTemperaturesEnCours();
 
public slots:
    void onLitEnCours(bool m_lecture);
 
signals:
 
private:
    DS18b20 m_threadSondesDS18b20;
 
    void run();
 
};
 
threadsondes.cpp
 
[CODE]
#include "threadsondes.h"
 
#include <QDebug>
 
ThreadSondes::ThreadSondes()
{
    qDebug() << "ThreadSondes";
}
 
void ThreadSondes::onLitEnCours(bool m_lecture)
{
    lecture = m_lecture;
}
 
void ThreadSondes::lectureTemperaturesEnCours()
{
    if (lecture == true) {
	qDebug() << "lecture = " << lecture;
    } else {
	qDebug() << "lecture = " << lecture;
    }
}
 
void ThreadSondes::run()
{
    while (1) {
 
	qDebug() << "run ThreadSondes()";
 
	lectureTemperaturesEnCours();
 
	/*m_threadSondesDS18b20.lectureSondeExt(); // on ecrite dans parametres en meme temps
	m_threadSondesDS18b20.lectureSondeUnitExt();
	m_threadSondesDS18b20.lectureSondeEcExt();
	m_threadSondesDS18b20.lectureSondeUnitInt();
	m_threadSondesDS18b20.lectureSondeEcInt();
 
	sleep(5);*/
    }
}

#ifndef THREADSONDES_H
#define THREADSONDES_H

#include <QThread>

#include <QObject>

#include "sondes.h"

class ThreadSondes: public QThread
{
	Q_OBJECT
	
public:
    ThreadSondes();
    
    bool lecture = false;
    
    void lectureTemperaturesEnCours();

public slots:
    void onLitEnCours(bool m_lecture);
    
signals:
    
private:
    DS18b20 m_threadSondesDS18b20;
    
    void run();
    
};

threadsondes.cpp

[CODE]
#include "threadsondes.h"

#include <QDebug>

ThreadSondes::ThreadSondes()
{
    qDebug() << "ThreadSondes";
}

void ThreadSondes::onLitEnCours(bool m_lecture)
{
    lecture = m_lecture;
}

void ThreadSondes::lectureTemperaturesEnCours()
{
    if (lecture == true) {
	qDebug() << "lecture = " << lecture;
    } else {
	qDebug() << "lecture = " << lecture;
    }
}

void ThreadSondes::run()
{
    while (1) {
	
	qDebug() << "run ThreadSondes()";
	
	lectureTemperaturesEnCours();
	
	/*m_threadSondesDS18b20.lectureSondeExt(); // on ecrite dans parametres en meme temps
	m_threadSondesDS18b20.lectureSondeUnitExt();
	m_threadSondesDS18b20.lectureSondeEcExt();
	m_threadSondesDS18b20.lectureSondeUnitInt();
	m_threadSondesDS18b20.lectureSondeEcInt();
	
	sleep(5);*/
    }
}

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[/CODE]

[d_stranz]

I'm trying to prevent reading and writing to a file at the same time with QSetting. Is there perhaps another way?

You should use a QMutex for this.

class SomeQtWidget : public QWidget
{
    Q_OBJECT;
 
public:
 
// ...
 
void  WriteSettings()
{
    mutex.lock();
 
    // write QSettings
 
   mutex.unlock();
}
 
void ReadSettings()
{
   mutex.lock()
 
   // read QSettings
 
   mutex.unlock();
}
 
private:
   QMutex  mutex;
 
};

class SomeQtWidget : public QWidget
{
    Q_OBJECT;

public:

// ...

void  WriteSettings()
{
    mutex.lock();

    // write QSettings

   mutex.unlock();
}

void ReadSettings()
{
   mutex.lock()

   // read QSettings
  
   mutex.unlock();
}

private:
   QMutex  mutex;

};

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Also in your Thread class, the run() method is an infinite loop that never gives the Qt event loop the opportunity to execute. So it will completely block any signals or slots in the thread from executing. As I explained in earlier posts, you need to call the processEvents() method in your thread classes.