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Forum Update on Tuesday, May 27th 2025

QVariant to QList

Scheduled Pinned Locked Moved Solved General and Desktop
c++model
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  • mzimmersM mzimmers

    This doesn't work either:

    QList<QString> qls = static_cast<QList<QString>>(value.toList());
    

    I think I'm overlooking something fairly basic here.

    JoeCFDJ Offline
    JoeCFDJ Offline
    JoeCFD
    wrote on last edited by
    #4

    @mzimmers said in QVariant to QList:

    QList<QString> qls = static_cast<QList<QString>>(value.toList());

    I am not sure static_cast works. Can you try to convert one after another with toString() in the list?

    1 Reply Last reply
    1
    • mzimmersM mzimmers

      This doesn't work either:

      QList<QString> qls = static_cast<QList<QString>>(value.toList());
      

      I think I'm overlooking something fairly basic here.

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by JonB
      #5

      @mzimmers
      I don't think a list of variants is/can be the same thing as a list of strings, or converted between the two/treated as such? (A QVariant cannot be a QString, it can only contain one.) My thought is you would want to iterate, appending each element?
      Note that this is purely a guess as I read this :)

      mzimmersM 1 Reply Last reply
      1
      • JonBJ JonB

        @mzimmers
        I don't think a list of variants is/can be the same thing as a list of strings, or converted between the two/treated as such? (A QVariant cannot be a QString, it can only contain one.) My thought is you would want to iterate, appending each element?
        Note that this is purely a guess as I read this :)

        mzimmersM Offline
        mzimmersM Offline
        mzimmers
        wrote on last edited by mzimmers
        #6

        @JonB I think you're saying basically the same thing that @JoeCFD is, and I think you're both right.

        But I still don't know how to cast/convert my QVariant value into a QString (or a QList<QString>).

        EDIT: though this comes close:

                    for (QString qs : value.toStringList()) {
                        item.equipment.append(qs);
                    }
        

        EDIT 2: which means this comes even closer:

                case EquipmentRole:
                    item.equipment.clear();
                    item.equipment.append(value.toStringList());
        
        JoeCFDJ 1 Reply Last reply
        0
        • mzimmersM mzimmers

          @JonB I think you're saying basically the same thing that @JoeCFD is, and I think you're both right.

          But I still don't know how to cast/convert my QVariant value into a QString (or a QList<QString>).

          EDIT: though this comes close:

                      for (QString qs : value.toStringList()) {
                          item.equipment.append(qs);
                      }
          

          EDIT 2: which means this comes even closer:

                  case EquipmentRole:
                      item.equipment.clear();
                      item.equipment.append(value.toStringList());
          
          JoeCFDJ Offline
          JoeCFDJ Offline
          JoeCFD
          wrote on last edited by
          #7

          @mzimmers item.equipment.append(value.toStringList()); is a good one. Does it work?

          mzimmersM 1 Reply Last reply
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          • JoeCFDJ JoeCFD

            @mzimmers item.equipment.append(value.toStringList()); is a good one. Does it work?

            mzimmersM Offline
            mzimmersM Offline
            mzimmers
            wrote on last edited by mzimmers
            #8

            @JoeCFD I can't tell for sure until I can expose this in QML, but I'm fairly sure it's working. I'll ask my other question in the QML forum.

            Thanks for the help, guys.

            EDIT: yeah, it seems to have worked.

            JoeCFDJ 1 Reply Last reply
            0
            • mzimmersM mzimmers

              @JoeCFD I can't tell for sure until I can expose this in QML, but I'm fairly sure it's working. I'll ask my other question in the QML forum.

              Thanks for the help, guys.

              EDIT: yeah, it seems to have worked.

              JoeCFDJ Offline
              JoeCFDJ Offline
              JoeCFD
              wrote on last edited by JoeCFD
              #9

              @mzimmers

              got this from ChatGPT and you are good.
              if (variant.canConvert<QStringList>()) {
              QList<QString> stringList = variant.toStringList();
              }

              mzimmersM JonBJ 2 Replies Last reply
              1
              • JoeCFDJ JoeCFD

                @mzimmers

                got this from ChatGPT and you are good.
                if (variant.canConvert<QStringList>()) {
                QList<QString> stringList = variant.toStringList();
                }

                mzimmersM Offline
                mzimmersM Offline
                mzimmers
                wrote on last edited by
                #10

                @JoeCFD yeah, I saw the canConvert() method in the docs, but forgot to add it to my code. Thanks for the reminder.

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                • JoeCFDJ JoeCFD

                  @mzimmers

                  got this from ChatGPT and you are good.
                  if (variant.canConvert<QStringList>()) {
                  QList<QString> stringList = variant.toStringList();
                  }

                  JonBJ Offline
                  JonBJ Offline
                  JonB
                  wrote on last edited by
                  #11

                  @JoeCFD said in QVariant to QList:

                  got this from ChatGPT

                  Depressing! :(

                  1 Reply Last reply
                  0
                  • JoeCFDJ Offline
                    JoeCFDJ Offline
                    JoeCFD
                    wrote on last edited by JoeCFD
                    #12

                    Understand. Think about you can never be the number 1 or even close anymore if you play chess.

                    mzimmersM 1 Reply Last reply
                    0
                    • JoeCFDJ JoeCFD

                      Understand. Think about you can never be the number 1 or even close anymore if you play chess.

                      mzimmersM Offline
                      mzimmersM Offline
                      mzimmers
                      wrote on last edited by
                      #13

                      @JoeCFD said in QVariant to QList:

                      Understand. Thiink about you can never be number 1 anymore if you play chess.

                      Oddly enough, that was never a concern of mine.

                      1 Reply Last reply
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