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How Can i get array in another class

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  • D dziko147
    20 Jul 2021, 11:41

    @anh_ph the funcToGetData(); can be a slot wich get data from GUI elements ?

    And if classA isn't child od classB . How can i call it

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    JonB
    wrote on 20 Jul 2021, 12:56 last edited by JonB
    #20

    @dziko147 said in How Can i get array in another class:

    And if classA isn't child od classB . How can i call it

    The code you were shown attempts to cast the parent() to classA. If your classA instance is not related to you classB instance through its parent, then use whatever you have for the desired classA instance....

    I'm not sure but you seem not to understand the difference between a class and an instance (or object)? If that is the case I suggest you read up to understand, as this is vital in OO programming.

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      dziko147
      wrote on 21 Jul 2021, 00:35 last edited by
      #21

      @JonB no i know the difference between instance and class .
      But honestly i have no idea what parent() mean .
      And if we say a classA is a child of classB we mean classA is inherited drom classB .

      Thank you

      J 1 Reply Last reply 21 Jul 2021, 06:19
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      • D dziko147
        21 Jul 2021, 00:35

        @JonB no i know the difference between instance and class .
        But honestly i have no idea what parent() mean .
        And if we say a classA is a child of classB we mean classA is inherited drom classB .

        Thank you

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        jsulm
        Lifetime Qt Champion
        wrote on 21 Jul 2021, 06:19 last edited by
        #22

        @dziko147 said in How Can i get array in another class:

        we mean classA is inherited drom classB

        No, we don't.
        See https://doc.qt.io/qt-5/objecttrees.html
        Parent/child is not about inheritance it is about relationships between QObject based classes.

        https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • D dziko147
          20 Jul 2021, 11:41

          @anh_ph the funcToGetData(); can be a slot wich get data from GUI elements ?

          And if classA isn't child od classB . How can i call it

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          anh_ph
          wrote on 21 Jul 2021, 07:30 last edited by
          #23

          @dziko147 said in How Can i get array in another class:

          @anh_ph the funcToGetData(); can be a slot wich get data from GUI elements ?

          And if classA isn't child od classB . How can i call it

          If you want to get data from classA, you must get an exact object of it, which works with the data. If you can't do it, then try to apply singleton to classA.
          Btw, you can't get an array in another class, but you can get an array in an object of another class.

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            dziko147
            wrote on 21 Jul 2021, 12:30 last edited by
            #24

            to resume what should i do to set data from GUI element in an array then get this array in another class .

            Btw I tried many solution but usually I get an empty array in the other class :)

            J 1 Reply Last reply 21 Jul 2021, 13:22
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            • D dziko147
              21 Jul 2021, 12:30

              to resume what should i do to set data from GUI element in an array then get this array in another class .

              Btw I tried many solution but usually I get an empty array in the other class :)

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              jsulm
              Lifetime Qt Champion
              wrote on 21 Jul 2021, 13:22 last edited by
              #25

              @dziko147 said in How Can i get array in another class:

              but usually I get an empty array in the other class

              I guess that's because you have more than one instance of the class from which you get your array.
              Please post your code. Passing data from one object to another is actually a trivial exercise.

              https://forum.qt.io/topic/113070/qt-code-of-conduct

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                dziko147
                wrote on 21 Jul 2021, 13:53 last edited by dziko147
                #26

                @jsulm

                // classeA.h
                std::array<QString,25> Inputs;
                
                // ClassA.cpp "UploadCSV"
                void UploadCSV::on_parambtn_2_clicked()
                {
                
                    int compteur=0;
                    QString cell0;
                    QString cell3 ;
                    for(int i=0;i<ui->tablewidget->rowCount();i++){
                
                        QTableWidgetItem *cell7 = ui->tablewidget->item(i,7);
                
                        QVariant myData7 = cell7->data(Qt::DisplayRole);
                        if (myData7=="Core_meas"){
                            cell0  = ui->tablewidget->item(i,0)->text();
                            cell3 = ui->tablewidget->item(i,3)->text();
                            Inputs[compteur]=cell3;
                            qDebug() << "Inputs baby"<<Inputs[compteur] ;
                            compteur++;
                        }
                
                    }
                
                
                }
                

                //in classB.

                UploadCSV *up;

                //in classB.cpp

                up=new UploadCSV();
                for(size_t i=0;i<up.Inputs->size();i++){
                qqDebug() << "this is data",up.Inputs[i]
                
                
                J P C 3 Replies Last reply 21 Jul 2021, 14:00
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                • D dziko147
                  21 Jul 2021, 13:53

                  @jsulm

                  // classeA.h
                  std::array<QString,25> Inputs;
                  
                  // ClassA.cpp "UploadCSV"
                  void UploadCSV::on_parambtn_2_clicked()
                  {
                  
                      int compteur=0;
                      QString cell0;
                      QString cell3 ;
                      for(int i=0;i<ui->tablewidget->rowCount();i++){
                  
                          QTableWidgetItem *cell7 = ui->tablewidget->item(i,7);
                  
                          QVariant myData7 = cell7->data(Qt::DisplayRole);
                          if (myData7=="Core_meas"){
                              cell0  = ui->tablewidget->item(i,0)->text();
                              cell3 = ui->tablewidget->item(i,3)->text();
                              Inputs[compteur]=cell3;
                              qDebug() << "Inputs baby"<<Inputs[compteur] ;
                              compteur++;
                          }
                  
                      }
                  
                  
                  }
                  

                  //in classB.

                  UploadCSV *up;

                  //in classB.cpp

                  up=new UploadCSV();
                  for(size_t i=0;i<up.Inputs->size();i++){
                  qqDebug() << "this is data",up.Inputs[i]
                  
                  
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                  jsulm
                  Lifetime Qt Champion
                  wrote on 21 Jul 2021, 14:00 last edited by
                  #27

                  @dziko147 Sorry, I fail to understand the code you posted.
                  What type is myclasseA? And why do you access Inputs from two different objects (up and myclasseA)?
                  It really looks like you have two different instances of UploadCSV...

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • D dziko147
                    21 Jul 2021, 13:53

                    @jsulm

                    // classeA.h
                    std::array<QString,25> Inputs;
                    
                    // ClassA.cpp "UploadCSV"
                    void UploadCSV::on_parambtn_2_clicked()
                    {
                    
                        int compteur=0;
                        QString cell0;
                        QString cell3 ;
                        for(int i=0;i<ui->tablewidget->rowCount();i++){
                    
                            QTableWidgetItem *cell7 = ui->tablewidget->item(i,7);
                    
                            QVariant myData7 = cell7->data(Qt::DisplayRole);
                            if (myData7=="Core_meas"){
                                cell0  = ui->tablewidget->item(i,0)->text();
                                cell3 = ui->tablewidget->item(i,3)->text();
                                Inputs[compteur]=cell3;
                                qDebug() << "Inputs baby"<<Inputs[compteur] ;
                                compteur++;
                            }
                    
                        }
                    
                    
                    }
                    

                    //in classB.

                    UploadCSV *up;

                    //in classB.cpp

                    up=new UploadCSV();
                    for(size_t i=0;i<up.Inputs->size();i++){
                    qqDebug() << "this is data",up.Inputs[i]
                    
                    
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                    Pl45m4
                    wrote on 21 Jul 2021, 14:00 last edited by Pl45m4
                    #28

                    @dziko147 said in How Can i get array in another class:

                    ,myclasseA.Inputs[i]

                    Why do you have myClasseA there, when the object is up
                    Try up.Inputs[i]

                    (Corrected, thx @jsulm )


                    If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                    ~E. W. Dijkstra

                    J 1 Reply Last reply 21 Jul 2021, 14:00
                    0
                    • P Pl45m4
                      21 Jul 2021, 14:00

                      @dziko147 said in How Can i get array in another class:

                      ,myclasseA.Inputs[i]

                      Why do you have myClasseA there, when the object is up
                      Try up.Inputs[i]

                      (Corrected, thx @jsulm )

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                      jsulm
                      Lifetime Qt Champion
                      wrote on 21 Jul 2021, 14:00 last edited by
                      #29

                      @Pl45m4 said in How Can i get array in another class:

                      when the object is UploadCSV

                      UploadCSV seems to be the class, not object

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • D Offline
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                        dziko147
                        wrote on 21 Jul 2021, 14:04 last edited by
                        #30

                        @jsulm sorry I edited the code .

                        I gave the expamle of classA and ClassB to be clearer .

                        ClassA (UploadCSV ) is a Qwidget : Qdialog

                        ClassB (Backend) is QObject .

                        J 1 Reply Last reply 21 Jul 2021, 14:07
                        0
                        • D dziko147
                          21 Jul 2021, 13:53

                          @jsulm

                          // classeA.h
                          std::array<QString,25> Inputs;
                          
                          // ClassA.cpp "UploadCSV"
                          void UploadCSV::on_parambtn_2_clicked()
                          {
                          
                              int compteur=0;
                              QString cell0;
                              QString cell3 ;
                              for(int i=0;i<ui->tablewidget->rowCount();i++){
                          
                                  QTableWidgetItem *cell7 = ui->tablewidget->item(i,7);
                          
                                  QVariant myData7 = cell7->data(Qt::DisplayRole);
                                  if (myData7=="Core_meas"){
                                      cell0  = ui->tablewidget->item(i,0)->text();
                                      cell3 = ui->tablewidget->item(i,3)->text();
                                      Inputs[compteur]=cell3;
                                      qDebug() << "Inputs baby"<<Inputs[compteur] ;
                                      compteur++;
                                  }
                          
                              }
                          
                          
                          }
                          

                          //in classB.

                          UploadCSV *up;

                          //in classB.cpp

                          up=new UploadCSV();
                          for(size_t i=0;i<up.Inputs->size();i++){
                          qqDebug() << "this is data",up.Inputs[i]
                          
                          
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                          CP71
                          wrote on 21 Jul 2021, 14:05 last edited by
                          #31

                          @dziko147 said in How Can i get array in another class:

                          up=new UploadCSV();
                          for(size_t i=0;i<up.Inputs->size();i++){
                          qqDebug() << "this is data",up.Inputs[i]

                          Sorry, who calls the on_parambtn_2_clicked() function?

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                          • D dziko147
                            21 Jul 2021, 14:04

                            @jsulm sorry I edited the code .

                            I gave the expamle of classA and ClassB to be clearer .

                            ClassA (UploadCSV ) is a Qwidget : Qdialog

                            ClassB (Backend) is QObject .

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                            jsulm
                            Lifetime Qt Champion
                            wrote on 21 Jul 2021, 14:07 last edited by
                            #32

                            @dziko147 Is this your real code:

                            up=new UploadCSV();
                            for(size_t i=0;i<up.Inputs->size();i++){
                            qqDebug() << "this is data",up.Inputs[i]
                            

                            ?
                            Because Items is filled when UploadCSV::on_parambtn_2_clicked() is called (at least according to code you posted). But you're printing Inputs just after creating UploadCSV instance (up)! So why should there be anything in Inputs?

                            https://forum.qt.io/topic/113070/qt-code-of-conduct

                            D 1 Reply Last reply 21 Jul 2021, 14:09
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                            • D Offline
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                              dziko147
                              wrote on 21 Jul 2021, 14:07 last edited by
                              #33

                              @CP71 it's called in UploadCSV class (classA) .

                              and inside this function I set data in Inputs[] .

                              J 1 Reply Last reply 21 Jul 2021, 14:08
                              0
                              • D dziko147
                                21 Jul 2021, 14:07

                                @CP71 it's called in UploadCSV class (classA) .

                                and inside this function I set data in Inputs[] .

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                                jsulm
                                Lifetime Qt Champion
                                wrote on 21 Jul 2021, 14:08 last edited by jsulm
                                #34

                                @dziko147 said in How Can i get array in another class:

                                it's called in UploadCSV class (classA) .

                                Where exactly?! And what is classA?! This all is really confusing!
                                up != classA

                                https://forum.qt.io/topic/113070/qt-code-of-conduct

                                D 1 Reply Last reply 21 Jul 2021, 14:11
                                1
                                • J jsulm
                                  21 Jul 2021, 14:07

                                  @dziko147 Is this your real code:

                                  up=new UploadCSV();
                                  for(size_t i=0;i<up.Inputs->size();i++){
                                  qqDebug() << "this is data",up.Inputs[i]
                                  

                                  ?
                                  Because Items is filled when UploadCSV::on_parambtn_2_clicked() is called (at least according to code you posted). But you're printing Inputs just after creating UploadCSV instance (up)! So why should there be anything in Inputs?

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                                  dziko147
                                  wrote on 21 Jul 2021, 14:09 last edited by
                                  #35

                                  @jsulm yes i understand you . So can you suggest a way to do this correctly ?

                                  J S 2 Replies Last reply 21 Jul 2021, 14:09
                                  0
                                  • D dziko147
                                    21 Jul 2021, 14:09

                                    @jsulm yes i understand you . So can you suggest a way to do this correctly ?

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                                    jsulm
                                    Lifetime Qt Champion
                                    wrote on 21 Jul 2021, 14:09 last edited by
                                    #36

                                    @dziko147 Yes, I can: use one instance of the class instead of two...

                                    https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                    • D dziko147
                                      21 Jul 2021, 14:09

                                      @jsulm yes i understand you . So can you suggest a way to do this correctly ?

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                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on 21 Jul 2021, 14:10 last edited by
                                      #37

                                      @dziko147 said in How Can i get array in another class:

                                      @jsulm yes i understand you . So can you suggest a way to do this correctly ?

                                      Something like it was explained in your other thread ?

                                      Interested in AI ? www.idiap.ch
                                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                      • J jsulm
                                        21 Jul 2021, 14:08

                                        @dziko147 said in How Can i get array in another class:

                                        it's called in UploadCSV class (classA) .

                                        Where exactly?! And what is classA?! This all is really confusing!
                                        up != classA

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                                        dziko147
                                        wrote on 21 Jul 2021, 14:11 last edited by
                                        #38

                                        @jsulm forget classA and classB example .

                                        So curretly we have UploadCSV class and BackendClass .
                                        I would like to get array defined from UploadCSV in Backend class .

                                        J P 2 Replies Last reply 21 Jul 2021, 14:13
                                        0
                                        • D dziko147
                                          21 Jul 2021, 14:11

                                          @jsulm forget classA and classB example .

                                          So curretly we have UploadCSV class and BackendClass .
                                          I would like to get array defined from UploadCSV in Backend class .

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                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on 21 Jul 2021, 14:13 last edited by
                                          #39

                                          @dziko147 said in How Can i get array in another class:

                                          I would like to get array defined from UploadCSV in Backend class

                                          Then do so.
                                          To get it you need the UploadCSV instance. How you get it in Backend I don't know as I don't have your code. There are different ways to do this. You can pass pointer to UploadCSV instance to Backend constructor for example.
                                          But to be able to give a good advice we would need to know how you manage your UploadCSV and Backend instances.

                                          https://forum.qt.io/topic/113070/qt-code-of-conduct

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