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  4. ASSERT failure in QList<T>::at: "index out of range"

ASSERT failure in QList<T>::at: "index out of range"

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qlistqstringlistc++qurlqt 5.7
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  • QjayQ Offline
    QjayQ Offline
    Qjay
    wrote on last edited by
    #15

    I have initialized current =0; in global scope .

    jsulmJ 1 Reply Last reply
    0
    • QjayQ Qjay

      I have initialized current =0; in global scope .

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #16

      @Qjay But is it changed somewhere?
      Why not just check like this?

      qDebug() << v.toStringList().size() << current;
      qDebug() << v.toStringList().at(current);
      QUrl url = v.toStringList().at(current);
      

      In such a situation this is actually the first thing to do...

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

      1 Reply Last reply
      1
      • QjayQ Offline
        QjayQ Offline
        Qjay
        wrote on last edited by
        #17

        hey @jsulm

        i tried what you suggested

        qDebug() << v.toStringList().size() << current;
        qDebug() << v.toStringList().at(current);
        QUrl url = v.toStringList().at(current);
        

        i did this

        qDebug() << "stringlist size and current" << v.toStringList().size() << current;
                qDebug() << "current url in stringlist" << v.toStringList().at(current);
                QUrl url = v.toStringList().at(current);
                qDebug() << "why break" << url;
        

        output

        stringlist size and current 33 0
        current url in stringlist   "(http://restbase.wikitolearn.org/en.wikitolearn.org/v1/media/math/render/svg/3cd95482da53d42c5f7f249454f7ee1e85cacc0c)"
        why break QUrl("")
        ""
        

        and then error

        ASSERT failure in QList<T>::at: "index out of range", file ../../Qt5.7.0/5.7/gcc_64/include/QtCore/qlist.h, line 537
        The program has unexpectedly finished.
        
        jsulmJ 1 Reply Last reply
        0
        • QjayQ Qjay

          hey @jsulm

          i tried what you suggested

          qDebug() << v.toStringList().size() << current;
          qDebug() << v.toStringList().at(current);
          QUrl url = v.toStringList().at(current);
          

          i did this

          qDebug() << "stringlist size and current" << v.toStringList().size() << current;
                  qDebug() << "current url in stringlist" << v.toStringList().at(current);
                  QUrl url = v.toStringList().at(current);
                  qDebug() << "why break" << url;
          

          output

          stringlist size and current 33 0
          current url in stringlist   "(http://restbase.wikitolearn.org/en.wikitolearn.org/v1/media/math/render/svg/3cd95482da53d42c5f7f249454f7ee1e85cacc0c)"
          why break QUrl("")
          ""
          

          and then error

          ASSERT failure in QList<T>::at: "index out of range", file ../../Qt5.7.0/5.7/gcc_64/include/QtCore/qlist.h, line 537
          The program has unexpectedly finished.
          
          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #18

          @Qjay Why is the URL in parentheses?

          (http://restbase.wikitolearn.org/en.wikitolearn.org/v1/media/math/render/svg/3cd95482da53d42c5f7f249454f7ee1e85cacc0c)
          

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

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #19

            Looks like you are doing a lot of parsing, replacement etc.

            The first thing I'd do, is to just ensure that you really have URLs in your list. And get rid of that QVariant parameter. It really doesn't make any sense in your use case.

            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
            0
            • QjayQ Offline
              QjayQ Offline
              Qjay
              wrote on last edited by Qjay
              #20

              Hello , thanks for the suggetions .

              1. yes there were useless ( ) in url . i have removed them . Now i am able to assign url to Qurl :D great!!

              2. i removed the Qvariant thing too

              now the code is

              .cpp : https://ghostbin.com/paste/vv2w7

              header file : https://ghostbin.com/paste/8z4y3

              but the assert error still exist :/

              1 Reply Last reply
              0
              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #21

                Still at the same place ?

                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
                0
                • QjayQ Offline
                  QjayQ Offline
                  Qjay
                  wrote on last edited by
                  #22

                  Hey @SGaist , @jsulm , thank you it's solved now

                  To be honest i don't know why it worked :/

                  but below is the code

                  https://ghostbin.com/paste/528m6

                  1 Reply Last reply
                  0
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #23

                    From the looks of it, you're currently lucky.

                    I'd recommend considering refactoring and cleaning up this code. Maybe a full rewrite would even be better.

                    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
                    0
                    • QjayQ Offline
                      QjayQ Offline
                      Qjay
                      wrote on last edited by
                      #24

                      I too was also thinking of full rewrite but i don't have much time for that right now :/ .

                      1 Reply Last reply
                      0

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