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Conditional breakpoint?

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  • JoeCFDJ JoeCFD

    @SPlatten previous reply is edited.

    SPlattenS Offline
    SPlattenS Offline
    SPlatten
    wrote on last edited by
    #5

    @JoeCFD , thank you, so I did this right clicking the member variable with a breakpoint set on a line, however I'm not sure this is what I want as the breakpoint will stop on the line where the breakpoint was created. I want a breakpoint that will halt at the location where the condition is true.

    Kind Regards,
    Sy

    JoeCFDJ 1 Reply Last reply
    0
    • SPlattenS SPlatten

      @JoeCFD , thank you, so I did this right clicking the member variable with a breakpoint set on a line, however I'm not sure this is what I want as the breakpoint will stop on the line where the breakpoint was created. I want a breakpoint that will halt at the location where the condition is true.

      JoeCFDJ Offline
      JoeCFDJ Offline
      JoeCFD
      wrote on last edited by JoeCFD
      #6

      @SPlatten add as many as you want with the same condition and you will catch it somewhere. As soon as you reach the breakpoint which meets the condition, you can trace back.

      SPlattenS 1 Reply Last reply
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      • JoeCFDJ JoeCFD

        @SPlatten add as many as you want with the same condition and you will catch it somewhere. As soon as you reach the breakpoint which meets the condition, you can trace back.

        SPlattenS Offline
        SPlattenS Offline
        SPlatten
        wrote on last edited by
        #7

        @JoeCFD , the problem is I don't know what is making the change or where, all I can say is I have one instance of an object which has a QFormLayout when I add a widget to it, its there and at some point between the next call to add the next widget, the previous widget is no longer there. I really don't know why.

        Kind Regards,
        Sy

        JonBJ JoeCFDJ 2 Replies Last reply
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        • SPlattenS SPlatten

          @JoeCFD , the problem is I don't know what is making the change or where, all I can say is I have one instance of an object which has a QFormLayout when I add a widget to it, its there and at some point between the next call to add the next widget, the previous widget is no longer there. I really don't know why.

          JonBJ Online
          JonBJ Online
          JonB
          wrote on last edited by JonB
          #8

          @SPlatten
          You cannot set a breakpoint in the way you would like. That would require the list to be monitored as every instruction is executed. I don't think gdb or even MSVC offers this.

          SPlattenS 1 Reply Last reply
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          • JonBJ JonB

            @SPlatten
            You cannot set a breakpoint in the way you would like. That would require the list to be monitored as every instruction is executed. I don't think gdb or even MSVC offers this.

            SPlattenS Offline
            SPlattenS Offline
            SPlatten
            wrote on last edited by
            #9

            @JonB , thank you, ok, I'm open to suggestions on how I might track down why the behaviour I'm seeing is occurring.

            Kind Regards,
            Sy

            JonBJ 1 Reply Last reply
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            • SPlattenS SPlatten

              @JonB , thank you, ok, I'm open to suggestions on how I might track down why the behaviour I'm seeing is occurring.

              JonBJ Online
              JonBJ Online
              JonB
              wrote on last edited by
              #10

              @SPlatten
              I know, I'm thinking about it. But doesn't mean I'll come up with anything... :)

              1 Reply Last reply
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              • SPlattenS SPlatten

                @JoeCFD , the problem is I don't know what is making the change or where, all I can say is I have one instance of an object which has a QFormLayout when I add a widget to it, its there and at some point between the next call to add the next widget, the previous widget is no longer there. I really don't know why.

                JoeCFDJ Offline
                JoeCFDJ Offline
                JoeCFD
                wrote on last edited by JoeCFD
                #11

                @SPlatten if you know which widget disappears(you should know by setting object name or id), create a shared point of it. Check if the shared pointer becomes nullptr at the steps where it may disapppear.

                JonBJ SPlattenS 2 Replies Last reply
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                • JoeCFDJ JoeCFD

                  @SPlatten if you know which widget disappears(you should know by setting object name or id), create a shared point of it. Check if the shared pointer becomes nullptr at the steps where it may disapppear.

                  JonBJ Online
                  JonBJ Online
                  JonB
                  wrote on last edited by
                  #12

                  @JoeCFD said in Conditional breakpoint?:

                  at the steps where it may disapppear.

                  The point is @SPlatten does not know where it may disappear.....

                  1 Reply Last reply
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                  • JoeCFDJ JoeCFD

                    @SPlatten if you know which widget disappears(you should know by setting object name or id), create a shared point of it. Check if the shared pointer becomes nullptr at the steps where it may disapppear.

                    SPlattenS Offline
                    SPlattenS Offline
                    SPlatten
                    wrote on last edited by
                    #13

                    @JoeCFD , I've called setObjectName on all the widgets I'm using, not sure how this helps tho.

                    Kind Regards,
                    Sy

                    JoeCFDJ JonBJ 2 Replies Last reply
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                    • SPlattenS SPlatten

                      @JoeCFD , I've called setObjectName on all the widgets I'm using, not sure how this helps tho.

                      JoeCFDJ Offline
                      JoeCFDJ Offline
                      JoeCFD
                      wrote on last edited by JoeCFD
                      #14

                      @SPlatten when the widget is created with that object name, you assign it to the shared pointer. You use break points to go down step by step to check if the shared pointer is null or not. Then you will know exactly where it disappears.

                      1 Reply Last reply
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                      • SPlattenS SPlatten

                        @JoeCFD , I've called setObjectName on all the widgets I'm using, not sure how this helps tho.

                        JonBJ Online
                        JonBJ Online
                        JonB
                        wrote on last edited by JonB
                        #15

                        @SPlatten
                        Very first thought: can you at least put a debug on the QObject::destroyed() for the object that goes missing? Find out whether that is happening.

                        And/or listen to what @JoeCFD is saying, I've never used a shared pointer but he obviously has!

                        SPlattenS 1 Reply Last reply
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                        • JonBJ JonB

                          @SPlatten
                          Very first thought: can you at least put a debug on the QObject::destroyed() for the object that goes missing? Find out whether that is happening.

                          And/or listen to what @JoeCFD is saying, I've never used a shared pointer but he obviously has!

                          SPlattenS Offline
                          SPlattenS Offline
                          SPlatten
                          wrote on last edited by
                          #16

                          @JonB , I'm not sure that the widget itself is being destroyed at all, only that it isn't in the list I appended it to when I go to add the next widget.

                          Kind Regards,
                          Sy

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