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Convert small PyQt script to Qt C++

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  • JonBJ JonB

    @Kris-Revi
    I assumed you would be familiar with C++, given that you want to translate from Python to C++?! :)

    To sort a QVector --- or if you pick another type like std::vector --- you will want to use std::sort.

    See e.g. https://stackoverflow.com/questions/47989208/sort-qvector-of-pointers-to-custom-objects if you do the items as pointers, or I gave you struct see https://forum.qt.io/topic/47037/solved-sorting-possible-on-a-qvector-that-has-a-struct-as-elements (that is old and some posts use qSort(), I suggest following @Chris-Kawa's post at https://forum.qt.io/topic/47037/solved-sorting-possible-on-a-qvector-that-has-a-struct-as-elements/8 which uses std::sort()).

    I admit I'm not 100% sure what the Python key=lambda g:g[0] is. I think it's just picking out the first field, stop, to sort on, not on the color field!

    K Offline
    K Offline
    Kris Revi
    wrote on last edited by
    #9

    @JonB aaand i gave up :/ i bet there is a ton of errors but...

    Header -> https://pastebin.com/UdDHhpBZ
    CPP -> https://pastebin.com/Eezyiqcg

    JonBJ J.HilkJ 2 Replies Last reply
    0
    • K Kris Revi

      @JonB aaand i gave up :/ i bet there is a ton of errors but...

      Header -> https://pastebin.com/UdDHhpBZ
      CPP -> https://pastebin.com/Eezyiqcg

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

      @Kris-Revi
      From a glance, it seems to me you are doing well. I hope you don't mean you are giving up having got this far? I can't spare much time, but do you want me to tell you the C++ for the couple of bits I see commented out in your .cpp?

      K 2 Replies Last reply
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      • JonBJ JonB

        @Kris-Revi
        From a glance, it seems to me you are doing well. I hope you don't mean you are giving up having got this far? I can't spare much time, but do you want me to tell you the C++ for the couple of bits I see commented out in your .cpp?

        K Offline
        K Offline
        Kris Revi
        wrote on last edited by
        #11

        @JonB sadly i am giving up :/ when i ran this it gave me a shit load of errors (i know that 1 error can cause other things to error out aswell) but i couldn't figure out the error anyway so

        jsulmJ 1 Reply Last reply
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        • K Kris Revi

          @JonB sadly i am giving up :/ when i ran this it gave me a shit load of errors (i know that 1 error can cause other things to error out aswell) but i couldn't figure out the error anyway so

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #12

          @Kris-Revi said in Convert small PyQt script to Qt C++:

          i know that 1 error can cause other things to error out aswell

          That's why you should always fix the first error first :-)

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

          K 1 Reply Last reply
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          • jsulmJ jsulm

            @Kris-Revi said in Convert small PyQt script to Qt C++:

            i know that 1 error can cause other things to error out aswell

            That's why you should always fix the first error first :-)

            K Offline
            K Offline
            Kris Revi
            wrote on last edited by
            #13

            @jsulm i coded everything needed (the cpp and h i linked) befor testing so :/

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            • JonBJ JonB

              @Kris-Revi
              From a glance, it seems to me you are doing well. I hope you don't mean you are giving up having got this far? I can't spare much time, but do you want me to tell you the C++ for the couple of bits I see commented out in your .cpp?

              K Offline
              K Offline
              Kris Revi
              wrote on last edited by
              #14

              @JonB said in Convert small PyQt script to Qt C++:

              but do you want me to tell you the C++ for the couple of bits I see commented out in your .cpp?

              i bet it wouldn't fix it anyway :/

              JonBJ 1 Reply Last reply
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              • K Kris Revi

                @JonB said in Convert small PyQt script to Qt C++:

                but do you want me to tell you the C++ for the couple of bits I see commented out in your .cpp?

                i bet it wouldn't fix it anyway :/

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

                @Kris-Revi
                It would not fix errors, no! I'm not clear whether you are saying your "errors" are at compile/link time, or at runtime....

                K 1 Reply Last reply
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                • K Kris Revi

                  @jsulm i coded everything needed (the cpp and h i linked) befor testing so :/

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

                  @Kris-Revi said in Convert small PyQt script to Qt C++:

                  i coded everything needed (the cpp and h i linked) befor testing so :/

                  I don't know what you mean here.
                  You wrote that you get errors when building the code, right?
                  So, start with the first error...

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

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #17

                    Hi,

                    One issue in your code is in your constructor, you are checking if the vector is empty but you have the logic reversed. You do something with it when it's actually empty.

                    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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                    • JonBJ JonB

                      @Kris-Revi
                      It would not fix errors, no! I'm not clear whether you are saying your "errors" are at compile/link time, or at runtime....

                      K Offline
                      K Offline
                      Kris Revi
                      wrote on last edited by
                      #18

                      @JonB said in Convert small PyQt script to Qt C++:

                      @Kris-Revi
                      It would not fix errors, no! I'm not clear whether you are saying your "errors" are at compile/link time, or at runtime....

                      @ compile

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

                        Can you share the errors you got ?

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                        • K Kris Revi

                          @JonB said in Convert small PyQt script to Qt C++:

                          @Kris-Revi
                          It would not fix errors, no! I'm not clear whether you are saying your "errors" are at compile/link time, or at runtime....

                          @ compile

                          JonBJ Online
                          JonBJ Online
                          JonB
                          wrote on last edited by JonB
                          #20

                          @Kris-Revi
                          Then, if you can't figure it, show us the first line at fault and what the error message is, if you'd like help... :)

                          BTW, it won't affect your compile behaviour, but you absolutely need to heed @SGaist's earlier observation for your run-time behaviour. Plus, I didn't follow the logic for the consequence, but you still have the commented-out initialization of the array when it's empty to deal with.

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                          • K Kris Revi

                            @JonB aaand i gave up :/ i bet there is a ton of errors but...

                            Header -> https://pastebin.com/UdDHhpBZ
                            CPP -> https://pastebin.com/Eezyiqcg

                            J.HilkJ Offline
                            J.HilkJ Offline
                            J.Hilk
                            Moderators
                            wrote on last edited by J.Hilk
                            #21

                            @Kris-Revi
                            Merry Christmas!

                            https://github.com/DeiVadder/QWidgetGradient.git


                            After some testing, the functionality is kind of strange, not sure if thats intended behavior, or if I made a bug 🤔
                            For you to find out I guess 😜


                            Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                            Q: What's that?
                            A: It's blue light.
                            Q: What does it do?
                            A: It turns blue.

                            K 1 Reply Last reply
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                            • J.HilkJ J.Hilk

                              @Kris-Revi
                              Merry Christmas!

                              https://github.com/DeiVadder/QWidgetGradient.git


                              After some testing, the functionality is kind of strange, not sure if thats intended behavior, or if I made a bug 🤔
                              For you to find out I guess 😜

                              K Offline
                              K Offline
                              Kris Revi
                              wrote on last edited by
                              #22

                              @J-Hilk wow, thank you sooo much! christmas came early!! <3

                              i get these errors in the Header file alone

                              G:\QT GUI\TesterGradient\gradient.h:31: error: C2429: attribute 'nodiscard' requires compiler flag '/std:c++17'
                              G:\QT GUI\TesterGradient\gradient.cpp:3: error: C2653: 'gradient': is not a class or namespace name
                              G:\QT GUI\TesterGradient\gradient.cpp:4: error: C4430: missing type specifier - int assumed. Note: C++ does not support default-int
                              G:\QT GUI\TesterGradient\gradient.cpp:6: warning: C4508: 'gradient': function should return a value; 'void' return type assumed
                              g:\qt gui\build-testergradient-desktop_qt_5_15_1_msvc2019_32bit-debug\debug\..\..\TesterGradient\gradient.h:31: error: C2429: attribute 'nodiscard' requires compiler flag '/std:c++17'
                              
                              J.HilkJ 1 Reply Last reply
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                              • K Kris Revi

                                @J-Hilk wow, thank you sooo much! christmas came early!! <3

                                i get these errors in the Header file alone

                                G:\QT GUI\TesterGradient\gradient.h:31: error: C2429: attribute 'nodiscard' requires compiler flag '/std:c++17'
                                G:\QT GUI\TesterGradient\gradient.cpp:3: error: C2653: 'gradient': is not a class or namespace name
                                G:\QT GUI\TesterGradient\gradient.cpp:4: error: C4430: missing type specifier - int assumed. Note: C++ does not support default-int
                                G:\QT GUI\TesterGradient\gradient.cpp:6: warning: C4508: 'gradient': function should return a value; 'void' return type assumed
                                g:\qt gui\build-testergradient-desktop_qt_5_15_1_msvc2019_32bit-debug\debug\..\..\TesterGradient\gradient.h:31: error: C2429: attribute 'nodiscard' requires compiler flag '/std:c++17'
                                
                                J.HilkJ Offline
                                J.HilkJ Offline
                                J.Hilk
                                Moderators
                                wrote on last edited by J.Hilk
                                #23

                                @Kris-Revi well, it compiles for me :P

                                remove the [[nodiscard]] attribute, its not needed, and if your compiler is not c++17 capable, no need to have it there


                                Edit: check the repo, I updated it, inclusive a bugfix I found.


                                Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                                Q: What's that?
                                A: It's blue light.
                                Q: What does it do?
                                A: It turns blue.

                                1 Reply Last reply
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