QTimer make traitement out of for loop ?

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.

imene

what i have to do ?

QObject::connect(m_speedTimer,&QTimer::timeout, this, &MainWindow::sendFrame,Qt::AutoConnection);

void MainWindow::sendFrame(QString IdData_R,QString PayloadData_R,int i)
{

            if (m_canDevice)
        {   m_speedTimer->start(6000);
        ...
         }

}

void MainWindow::on_SendAll_Button_clicked()
{int a= m_ui->Table_CSV->model()->rowCount();
 for(int i=0;i<a; i++) //R :read , W :write
    { sendFrame(IdData_R, PayloadData_R,i);//});
     }
    
    m_speedTimer->stop();
    
 }

mpergand

@imene
your code doesn't make sense.
What do you want to do,
send a frame every 6s ?