How to pass the parameters between the SIGNAL and SLOTS

[mrjj]

@Alex42

Hi
In the code you shown, you call
emit newtextChanged_1(mence->text());
in the top and that seems to work.

But I don't see you call
emit after any of the calculations?

It will send a copy of the text so you have to do it after you have put it into mence->setText.

so if you don't have it, you need the emit to be at the end of the function.

[Alex42]

i'm tried to emit the signal at the beginning and at the end of this function but without success

[Alex42]

i will try to emit the signal every time i do a calculation in this fonction

[Alex42]

@Alex42 said in How to pass the parameters between the SIGNAL and SLOTS:

i will try to emit the signal every time i do a calculation in this fonction

i'm trying to emit the signal every time i do a calculation in this fonction but without success

case 2 :
          if ( Val0 <Val1)
          {

               ui->lineEdit_17->setText(QString::number(Val9));
     mence->setText(QString::number(Val9));
               emit newtextChanged_1(mence->text());
                  }
          else if ( ((Val0>Val1) && (Val0<Val2)) || (Val0>2))
          {
               // V1 = Val0* Val10/Val2;
              V1= Val10 * (Val0 - Val1)/(Val2-Val1) +Val9 *(Val2-Val0)/(Val2-Val1);

                  ui->lineEdit_17->setText(QString::number(V1));
                  emit newtextChanged_1(mence->text());
                 mence->setText(QString::number(V1));
          }

[Alex42]

incredible , when i try this he work very will

void Mesure  :: calculate_3 ()
{
    S++;


     emit newtextChanged_1(QString::number (S));
}

but withe this signal he want to work

   emit newtextChanged_1(mence ->text());

[mrjj]

@Alex42

Ok.
I was wondering one thing.
All your other linedits are in the UI
but mence
is not

Do you have 2 of them for some reason ?
so there is also the
ui->mence ?

Why is mence not in the UI.
Do you insert it from code to the fom?

[Alex42]

@mrjj ,it's a good question, i coded mence (QlineEdit) with a hand , because , ui->lineEdit_17 ->text () he doesn't work, for this i created mence -> text() ,
but the bothe not want to work

[Alex42]

the ui->lineEdit_17->text() ,and mence ->text() , it's the same thing , just one coded with a hand , and auther coder with Qt creator Form (Ui)

[J.Hilk]

@Alex42
I'm sure, that if you do:

void Mesure  :: calculate_3 ()
{
    S++;

    mence->setText(QString::number (S));
     emit newtextChanged_1(mence->text());
}

it will work just as well as

void Mesure  :: calculate_3 ()
{
    S++;


     emit newtextChanged_1(QString::number (S));
}

somewhere you're setting your mence->text to 0

I good point to start the debugger and step through your code line by line, btw.

[Alex42]

@J-Hilk , thank you for your response , yes i don't any probleme with your code ( it works very will )

but the probleme it's when i try to transmete the real values ,
are you understande that the real valueu it's not number S ?

[Alex42]

as i mentioned below, my edited QLine (mence ->text(), OR, ui->lineEdite_17->text()) contains scientific calculation results which change every 1000ms

[J.Hilk]

@Alex42 said in How to pass the parameters between the SIGNAL and SLOTS:

are you understande that the real valueu it's not number S ?

I do, do you realise, that mence is not the problem here ?

on a hinge: try the following:

//V1= Val10 * (Val0 - Val1)/(Val2-Val1) +Val9 *(Val2-Val0)/(Val2-Val1);
mence->setText(QString::number( ( Val10 * (Val0 - Val1)/static_cast<double>(Val2-Val1) +Val9 *(Val2-Val0)/static_cast<double>(Val2-Val1) ) ));;

[Alex42]

@J-Hilk said in How to pass the parameters between the SIGNAL and SLOTS:

//V1= Val10 * (Val0 - Val1)/(Val2-Val1) +Val9 *(Val2-Val0)/(Val2-Val1);
mence->setText(QString::number( ( Val10 * (Val0 - Val1)/static_cast<double>(Val2-Val1) +Val9 *(Val2-Val0)/static_cast<double>(Val2-Val1) ) ));;

it's the same problem

[Alex42]

you know in the same classe i don't have any problem , just when i try to read the values in another class, for exemple
when i do this in the same classe i have no probleme

connect (ui->lineEdit_17, SIGNAL (textChanged(QString)), this ,SLOT (encore_2(QString)));
void mesure::encore_2(QString)
{

mence->setText(ui->lineEdit_17->text());

[Alex42]

@J-Hilk said in How to pass the parameters between the SIGNAL and SLOTS:

somewhere you're setting your mence->text to 0

it can be a private or public story because I declared my variables inside the calculate () slot

[mrjj]

@Alex42

Go to where you define mence and right click and use "Find Usage" and it will show all places.

I cannot guess what it only send zero but we know signal works and we can send a string
so its a logical bug with mence and we cannot not spot it as we see only pieces and its easy to stare blind on own code so you dont either.

[Alex42]

@mrjj said in How to pass the parameters between the SIGNAL and SLOTS:

so its a logical bug with mence and we cannot not spot it as we see only pieces and its easy to stare blind on own code so you dont either.

@ mrjj, @J.Hilk, thank you for your help, so i will try to change my logic of coded, and i will take you know of the evolution