QTimer make traitement out of for loop ?

[JonB]

@imene
Not a problem :) Actually it looks like I remembered wrong and people had not started responding in that thread!

[SGaist]

Based on you other thread, I would say that you should refactor your payload processing logic.

Rather than I tight loop that you are going to block use for example invokeMethod when you are done with the processing of the current payload. That way, for that particular case, you will call invokeMethod as the last thing in you lambda to continue the processing. Your loop will otherwise continue.

[imene]

@SGaist good like this method preposed by @mpergand here (https://forum.qt.io/topic/138912/how-can-i-set-time-out-condition-in-the-timer-duplicated-https-forum-qt-io-topic-138913-qtimer-make-traitement-out-of-for-loop/3)

[SGaist]

That's one way of implementing it.

[imene]

@SGaist is there a way more easy than that ? with another type of timer ?
can i use this signal void QTimer::timeout()?

[mpergand]

@imene
For your long delay, you can use lambda as well,
Although I don't see any real benefit with it.

[imene]

@mpergand
What do you mean with lamba ?

[jsulm]

@imene C++ lambda functions: https://en.cppreference.com/w/cpp/language/lambda

[imene]

QTimer::singleShot :This static function calls a slot after a given time interval; in my case i want the code to make the traitement inside QTimer::singleShot before it pass to make the next if condition .

[Christian Ehrlicher]

@imene said in QTimer make traitement out of for loop ?:

to make the traitement inside QTimer::singleShot before it pass to make the next if condition .

Let the QTimer::singleShot() fire and check for your codition inside the slot.

[imene]

@Christian-Ehrlicher how ?

[Christian Ehrlicher]

@imene said in QTimer make traitement out of for loop ?:

how ?

if (yourCoditionIsMet) {
  doSomethingYouWant()
}

maybe?

[imene]

@Christian-Ehrlicher
my condition is to wait for QTimer::singleShot() to be executed

[Christian Ehrlicher]

@imene said in QTimer make traitement out of for loop ?:

my condition is to wait for QTimer::singleShot() to be executed

Why?
If you want to stop a timer, use a QTimer object and stop it if you want.

[imene]

This timer

connect(m_speedTimer, &QTimer::timeout, this, &MainWindow::on_Send_Row_Button_clicked);

 if( trameRecu[0]==trameTest[0]){
                qDebug() <<"Test FF good!"; //model dialogue informing
                mModel->item(b, 4)->setText("FF");//ack
               

                m_speedTimer->start(8000);


                       QTimer::singleShot(7000, [=](){
                    qDebug()<<"Timer on do something after 7000 msec...";


                if((Send_Frame_Get_ACK_Function(SetPayloadRPM))=="FF")

                { qDebug()  << "Send_Frame_Get_ACK_Function Pass" ;

                    QString MySpeed=0;

                  MySpeed = Send_Frame_Get_Speed_Function(NSetPayload); //SetPayloadMem="F504"
                  qDebug()  << " MySpeed" <<MySpeed;

                  double MSpeed = MySpeed.toFloat();
                    qDebug()  << " MSpeed" <<MSpeed;
                  bool result = ((MSpeed >= 40) && (MSpeed <= 60));
                          qDebug() << "((MSpeed >= 40) && (MSpeed <= 60))" << result;
                          result = ((MSpeed >= 90) && (MSpeed <= 110)  );
                          qDebug() << "((MSpeed >= 90) && (MSpeed <= 110))" << result;
                          result = ((MSpeed >= 490) && (MSpeed <= 520)  );
                          qDebug() << "((MSpeed >= 490) && (MSpeed <= 520))" << result;

                  if ((MSpeed > 40) && (MSpeed < 60)  )

                  {mModel->item(b, 6)->setText("+50");}//result

                  else if ((MSpeed > 90) && (MSpeed < 110))
                  {mModel->item(b, 6)->setText("+100");}//result

                  else if ((MSpeed > 140) && (MSpeed < 160))
                  {mModel->item(b, 6)->setText("+150");}//result

                  else if ((MSpeed > 190) && (MSpeed < 210))
                  {mModel->item(b, 6)->setText("+200");}//result

                  else if ((MSpeed > 240) && (MSpeed < 260))
                  {mModel->item(b, 6)->setText("+100");}//result

                  else if ((MSpeed > 290) && (MSpeed < 310))
                  {mModel->item(b, 6)->setText("+100");}//result


                  else if ((MSpeed >490) && (MSpeed < 520))
                  {mModel->item(b, 6)->setText("+500");}//result
                  else
                  {mModel->item(b, 6)->setText("Error");
                  qDebug()  << " MSpeed if" <<MSpeed;}//result


                }

                m_speedTimer->stop();

               });//singleshot timer here

            }

m_speedTimer->start(8000);
repeat the traitement under it each 8000 but when i use m_speedTimer->stop(); it make traitement one time and stops without waiting 8000 msec!
I need a timer that make traitement after 8000msec.

[Christian Ehrlicher]

@imene said in QTimer make traitement out of for loop ?:

t make traitement one time and stops without waiting 8000 msec!

Then remember that you want to stop your timer after the next timeout and stop it then.

[imene]

What does m_speedTimer->start(8000); and m_speedTimer->stop(); do exactely ?

[Christian Ehrlicher]

@imene said in QTimer make traitement out of for loop ?:

What does m_speedTimer->start(8000); and m_speedTimer->stop(); do exactely ?

Really??

RTM https://doc.qt.io/qt-6/qtimer.html

[imene]

I want a timer that stop reading the code for 7sec then complete and execute the function, because singleShot timer execute function after 7 sec here:

QTimer::singleShot(7000, [=](){
                    qDebug()<<"Timer on do something after 6 second...";


               // i want to set a time out condition here

               });//timer ends here

[Christian Ehrlicher]

@imene said in QTimer make traitement out of for loop ?:

qDebug()<<"Timer on do something after 6 second...";

QTimer::singleShot(7000, ={

Maybe you should at least add a correct comment...

We already told you how to start a timer, how to stop it and how you set a (member) variable to not execute something if this variable is set to a certain value is nothing we need to discuss here - it's a task for a c++ beginners book.