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Access and inheritance

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  • jsulmJ jsulm

    @tomy Please run through debugger and post stack trace after it crashed...

    tomyT Offline
    tomyT Offline
    tomy
    wrote on last edited by
    #38

    @jsulm
    Do you mean by pressing F5, please?
    If so, I did it, but how to post stack trace?

    0_1550499661735_Capture_1.PNG

    1 Reply Last reply
    0
    • mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #39

      Hi
      It is the list to the right we are after

      The code
      for entries Level 2,3 would help a lot.

      tomyT 1 Reply Last reply
      2
      • mrjjM mrjj

        Hi
        It is the list to the right we are after

        The code
        for entries Level 2,3 would help a lot.

        tomyT Offline
        tomyT Offline
        tomy
        wrote on last edited by
        #40

        @mrjj,
        Hi,

        0_1550500483783_1.PNG

        Do you mean I copy and paste code for level 7 and 11 here?
        7 is the project's code but 11 includes thousands of lines of code.

        mrjjM 1 Reply Last reply
        0
        • tomyT tomy

          @mrjj,
          Hi,

          0_1550500483783_1.PNG

          Do you mean I copy and paste code for level 7 and 11 here?
          7 is the project's code but 11 includes thousands of lines of code.

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #41

          @tomy
          Hi
          The line it shows when you click on 11 ? line 1339

          tomyT 1 Reply Last reply
          1
          • mrjjM mrjj

            @tomy
            Hi
            The line it shows when you click on 11 ? line 1339

            tomyT Offline
            tomyT Offline
            tomy
            wrote on last edited by
            #42

            @mrjj, Hi,

            Here you are:

            0_1550504186993_2.PNG

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            0
            • mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #43

              Hi
              it was not what i as i had hoped, it being inside some of the user code.
              I wonder if you have a double free.
              Did you change anything in main.cpp?

              tomyT 1 Reply Last reply
              0
              • mrjjM mrjj

                Hi
                it was not what i as i had hoped, it being inside some of the user code.
                I wonder if you have a double free.
                Did you change anything in main.cpp?

                tomyT Offline
                tomyT Offline
                tomy
                wrote on last edited by tomy
                #44

                @mrjj Hi,

                Here is main.cpp:

                #include "myspreadsheet.h"
                #include <QApplication>
                #include <QSplashScreen>
                
                int main(int argc, char *argv[])
                {
                    QApplication app(argc, argv);
                
                    QSplashScreen* splash = new QSplashScreen;
                    splash->setPixmap(QPixmap(":/images/splash.jpg"));
                    splash->show();
                
                    Qt::Alignment topRight = Qt::AlignRight | Qt::AlignTop;
                    splash->showMessage(QObject::tr("Setting up the main window..."), topRight, Qt::white);
                
                
                    MySpreadsheet* mySP = new MySpreadsheet;
                    if(argc > 1)
                        mySP -> loadFile(argv[1]);
                
                    mySP -> show();
                    splash -> finish(mySP);
                    delete splash;
                
                    return app.exec();
                }
                

                I added those splash stuff and now apparently it's fine!

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                • mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #45

                  Hi
                  Does look fine.
                  Try set breakpoint in main.cpp and press f10 to signle step over it and
                  see if we can find the reason for the crash.
                  Since its first on close, it might be inside MySpreadsheet indirectly.

                  tomyT 1 Reply Last reply
                  1
                  • mrjjM mrjj

                    Hi
                    Does look fine.
                    Try set breakpoint in main.cpp and press f10 to signle step over it and
                    see if we can find the reason for the crash.
                    Since its first on close, it might be inside MySpreadsheet indirectly.

                    tomyT Offline
                    tomyT Offline
                    tomy
                    wrote on last edited by
                    #46

                    @mrjj
                    Hi, It's fine now. :) Thanks so much. :)

                    mrjjM 1 Reply Last reply
                    1
                    • tomyT tomy

                      @mrjj
                      Hi, It's fine now. :) Thanks so much. :)

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #47

                      @tomy
                      Hi
                      What was it ? Just to learn also.

                      tomyT 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        @tomy
                        Hi
                        What was it ? Just to learn also.

                        tomyT Offline
                        tomyT Offline
                        tomy
                        wrote on last edited by
                        #48

                        @mrjj Hi,

                        The faulty one didn't include splash stuff and was this way I think:

                        #include "myspreadsheet.h"
                        #include <QApplication>
                        
                        int main(int argc, char *argv[])
                        {
                            QApplication app(argc, argv);
                            MySpreadsheet* mySP = new MySpreadsheet;
                            mySP -> show();
                        
                            return app.exec();
                        }
                        

                        Then I added the splash stuff. Now it "apparently" is fine, but I'm still not sure not do I know of the exact reason for that red message either. :(

                        1 Reply Last reply
                        1
                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #49

                          You are not deleting mySP. The memory will be cleaned up at the end of the application but this doesn't mean that the destructor will be called. So if you have anything there that does something it's not guaranteed to be called.

                          You should rather keep it on the stack or delete it after returning from app.exec();

                          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
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