How to pass the parameters between the SIGNAL and SLOTS

Alex42

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

emit newtextChanged_1(mence->text()); // wont work ?

emit newtextChanged_1(mence->text()); // wont work ? exactly what i whant to do buthe d'ont work

mrjj

@Alex42

Hi
does
QString test("hello");
emit newtextChanged_1(test);

works ?

Both should work if the
QString::number (ui->lcdNumber_1->value()) works.

Alex42

@mrjj , QString test("hello");
emit newtextChanged_1(test);

works ?

yes it works very well

Alex42

are you undestad that may QLineEdite change every 1000ms ?

mrjj

@Alex42

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.