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How Can i get array in another class

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  • D dziko147

    @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

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on 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

      @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

      A Offline
      A Offline
      anh_ph
      wrote on 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.

      1 Reply Last reply
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      • D Offline
        D Offline
        dziko147
        wrote on 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 :)

        jsulmJ 1 Reply Last reply
        0
        • D dziko147

          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 :)

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on 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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          • D Offline
            D Offline
            dziko147
            wrote on 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]
            
            
            jsulmJ Pl45m4P CP71C 3 Replies Last reply
            0
            • D dziko147

              @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]
              
              
              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on 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

              1 Reply Last reply
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              • D dziko147

                @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]
                
                
                Pl45m4P Offline
                Pl45m4P Offline
                Pl45m4
                wrote on 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

                jsulmJ 1 Reply Last reply
                0
                • Pl45m4P Pl45m4

                  @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 )

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on 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

                  1 Reply Last reply
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                  • D Offline
                    D Offline
                    dziko147
                    wrote on 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 .

                    jsulmJ 1 Reply Last reply
                    0
                    • D dziko147

                      @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]
                      
                      
                      CP71C Offline
                      CP71C Offline
                      CP71
                      wrote on 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?

                      1 Reply Last reply
                      1
                      • D dziko147

                        @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 .

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on 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
                        3
                        • D Offline
                          D Offline
                          dziko147
                          wrote on last edited by
                          #33

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

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

                          jsulmJ 1 Reply Last reply
                          0
                          • D dziko147

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

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

                            jsulmJ Offline
                            jsulmJ Offline
                            jsulm
                            Lifetime Qt Champion
                            wrote on 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
                            1
                            • jsulmJ jsulm

                              @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?

                              D Offline
                              D Offline
                              dziko147
                              wrote on last edited by
                              #35

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

                              jsulmJ SGaistS 2 Replies Last reply
                              0
                              • D dziko147

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

                                jsulmJ Offline
                                jsulmJ Offline
                                jsulm
                                Lifetime Qt Champion
                                wrote on 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

                                1 Reply Last reply
                                2
                                • D dziko147

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

                                  SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on 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

                                  1 Reply Last reply
                                  1
                                  • jsulmJ jsulm

                                    @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

                                    D Offline
                                    D Offline
                                    dziko147
                                    wrote on 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 .

                                    jsulmJ Pl45m4P 2 Replies Last reply
                                    0
                                    • D dziko147

                                      @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 .

                                      jsulmJ Offline
                                      jsulmJ Offline
                                      jsulm
                                      Lifetime Qt Champion
                                      wrote on 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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                                      • D Offline
                                        D Offline
                                        dziko147
                                        wrote on last edited by
                                        #40

                                        @jsulm
                                        currently I pass a pointer like this .
                                        in backend.h

                                        UploadCSV *up;
                                        

                                        in backend.cpp

                                        up = new UploadCSV();
                                        
                                        CP71C jsulmJ 3 Replies Last reply
                                        0
                                        • D dziko147

                                          @jsulm
                                          currently I pass a pointer like this .
                                          in backend.h

                                          UploadCSV *up;
                                          

                                          in backend.cpp

                                          up = new UploadCSV();
                                          
                                          CP71C Offline
                                          CP71C Offline
                                          CP71
                                          wrote on last edited by CP71
                                          #41

                                          @dziko147
                                          Here you are not passing a pointer but you are creating a new instance of class

                                          1 Reply Last reply
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