How to pass the parameters between the SIGNAL and SLOTS

[mrjj]

@Alex42
The dropbox link is the full project you can just run.
If not allowed to use dropbox is there any other such service you are allowed to use ?
(you don't have to register. just press the download and you should get zip file)

[Alex42]

ok, ok ,
when I try it all alone, (with only the QTimer ) it works very well, (like your exemple )
but when i try my real interface it does not work

you know ?
my first QlineEdit (1 forme ) containe the result of the calculaions (which makes calculates each 1000ms) whithe this fonction ```

i show you how the calcualte_3() fonction do

void Mesure :: calculate_3 ()
{

    S++;

    if (S>0)
    {
    emit newtextChanged_1(mence->text());  /// works

    double  Val13=ui->lineEdit_13->text().toInt();
    double  Val14=ui->lineEdit_14->text().toInt();
    double  Val15=ui->lineEdit_15->text().toInt();
    double  Val16=ui->lineEdit_16->text().toInt();
double  V1,V2, V3 ,V4, V5, V6,V7;
    int P=ui->spinBox_1->value();
      switch (P) {
      case 2 :
          if ( Val0 <Val1)
          {

               ui->lineEdit_17->setText(QString::number(Val9));
              // mence->setText(QString::number(Val9));
                  }
          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));
                //  mence->setText(QString::number(V1));
          }

          break;
    case 3:
          if ( ((Val0>Val2) && (Val0<Val3))|| (Val0>Val3) )
          {

            V2 = Val11 * (Val0 - Val2)/(Val3-Val2) +Val10 *(Val3-Val0)/(Val3-Val2);
             //V2 = Val12 * (Val0-Val2/Val3-Val2) + Val10 * (Val3-Val0/Val3-Val2);

           ui->lineEdit_17->setText(QString::number(V2));
           //mence->setText(QString::number(V2));

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

          }
          break;
          /*
           else if (Val0>Val1 && Val0 <Val2 &&Val0 < Val3 ) {

             // V3 = (Val10 * (Val3-Val0) - Val11 * (Val2-Val0))/(Val3-Val2);
              //ui->lineEdit_17->setText(QString::number(V3));
               V1 = Val0* Val10/Val2;
              ui->lineEdit_17->setText(QString::number(V1));
      } else if (  Val0 > Val3)
               {



             V4= ((Val0 - Val2)* Val11 - Val10 * (Val0-Val3))/ (Val3-Val2) ;
             ui->lineEdit_17->setText(QString::number(V4));
          }
        */
          break;
      case 4 :
          if (((Val0 > Val3) && (Val0 <Val4) )||(Val0>Val4))
          {
              V3 = Val12 * (Val0-Val3)/(Val4-Val3) +Val11 * (Val4-Val0)/(Val4-Val3);
              ui->lineEdit_17->setText(QString::number(V3));
            //  mence->setText(QString::number(V3));
          } else if ((Val0>Val2) && (Val0 <Val3))

and this fonction is update withe the Qtimer lik this connection 

connect (timer, SIGNAL (timeout()), this ,SLOT (calculate_3()));

[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