How to pass the parameters between the SIGNAL and SLOTS

Alex42

are you undestad that may QLineEdite change every 1000ms ?

mrjj

Ok that is a bit o.O

so try

QString text = mence->text();
qDebug() << "sending:" << text;
emit ewtextChanged_1(text);

and see if the mence is the one you think it is as that is my only guess then as
the signal clearly works :)

Yes, I understand you change the text of the lineEdit every sec,but that should not matter
as we just get what ever was set last when we ask.

Alex42

yes exactly what i want , befor i tried this and works very well ,
but the probleme is in the second interface i can't receve this data ![alt text]( image url)
( in the seconde interface i receve only 0( the fiste values) , i can't receive the values when is chenged

mrjj

@Alex42

So in interface 2, you only see the "0" and never "12222" etc ?

But you could send "hello" and other string ?
That I cant explain. seems impossible.

Just so I understand.

You have a main window and 2 buttons. Each button opens a new Form/window and
form1 has a timer or something that makes a lineEdit count/set some value.
This value you try to emit to form2 when calculate_3 is called ?

Alex42

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

So in interface 2, you only see the "0" and never "12222" etc ?

So in interface 2, you only see the "0" and never "12222" etc ? yes exactly
But you could send "hello" and other string ? yes i can send hello
You have a main window and 2 buttons. Each button opens a new Form/window and
form1 has a timer or something that makes a lineEdit count/set some value.
This value you try to emit to form2 when calculate_3 is called ? exactly what i want to do

mrjj

@Alex42
Ok. how is the LineEdit updated ?
a Qtimer ?

Alex42

yes a Qtimer

mrjj

@Alex42

Ok. hang on for 20 mins. Ill try myself as it does seem strange :)

Alex42

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

Ok. hang on for 20 mins. Ill try myself as it does seem strange :)

ok thank you very match for your helpe

Alex42

i'm sorry, i have a lot of classe , methode and line of code, and there is interaction between them with QTimer , Mathematique fonction ...etc , for this i can't to post all my code

mrjj

@Alex42
Thats ok.
I will make a fast example and if that just works, you can have it and have a look.
Maybe we can find out what the difference it. :)

Alex42

OK , thank you

mrjj

hi
Seems to work fine even with a 100 MS timer so should work for you too.

Can you please try ?

https://www.dropbox.com/s/l8go4t71unosl05/CrossTalk.zip?dl=0

alt text

Alex42

ok , can you show me your code please ;

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));
          }