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  4. [SOLVED] Invalid use of incomplete type 'class UI::MainWindow'
Forum Update on Monday, May 27th 2025

[SOLVED] Invalid use of incomplete type 'class UI::MainWindow'

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incomplete typemainwindowqt5.5header cpp qtinclude
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  • L Lorence
    22 Aug 2015, 18:05

    http://i.imgur.com/3O9O6Vg.png
    this is the error im getting

    M Offline
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    mrjj
    Lifetime Qt Champion
    wrote on 22 Aug 2015, 18:08 last edited by
    #10

    @Lorence
    Hmm it seems its "ui" it do not like.
    Let me test.

    M 1 Reply Last reply 22 Aug 2015, 18:13
    0
    • M mrjj
      22 Aug 2015, 18:08

      @Lorence
      Hmm it seems its "ui" it do not like.
      Let me test.

      M Offline
      M Offline
      mrjj
      Lifetime Qt Champion
      wrote on 22 Aug 2015, 18:13 last edited by mrjj
      #11

      @mrjj
      ahh, Ui::MainWindow is defined in
      #include "ui_main_window.h"
      which is included in the CPP file so the type is not fully defined so you cannot say
      ui->Somename
      as Ui::MainWindow is not defined yet.

      moving
      #include "ui_main_window.h"
      to the minwin.h file allows it but not sure if it will confuse Qt Creator.

      Also it will complain about not being able to convert Tile to Tile * as list is not pointers and ui->grassyTile will be.

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      • L Offline
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        Lorence
        wrote on 22 Aug 2015, 18:17 last edited by
        #12

        ahh, Ui::MainWindow is defined in
        #include "ui_main_window.h"

        didnt think of that, thanks! but new error comes

        http://i.imgur.com/unRPdII.png

        M 1 Reply Last reply 22 Aug 2015, 18:23
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        • L Lorence
          22 Aug 2015, 18:17

          ahh, Ui::MainWindow is defined in
          #include "ui_main_window.h"

          didnt think of that, thanks! but new error comes

          http://i.imgur.com/unRPdII.png

          M Offline
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          mrjj
          Lifetime Qt Champion
          wrote on 22 Aug 2015, 18:23 last edited by
          #13

          @Lorence

          Yeah, it tries to construct a new Tile to go into the list.

          Can I ask if you want a list of pointers to tiles you have on screen or
          a list with new Tiles that has nothing to do with those on screen?

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          • L Offline
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            Lorence
            wrote on 22 Aug 2015, 18:30 last edited by Lorence
            #14

            sorry for the late reply.

            i just want a list of tiles to choose from.

            but QT disabled the copying of QLabel,
            so i really need to have a pointer of tiles?

            M 1 Reply Last reply 22 Aug 2015, 18:33
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            • L Lorence
              22 Aug 2015, 18:30

              sorry for the late reply.

              i just want a list of tiles to choose from.

              but QT disabled the copying of QLabel,
              so i really need to have a pointer of tiles?

              M Offline
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              mrjj
              Lifetime Qt Champion
              wrote on 22 Aug 2015, 18:33 last edited by mrjj
              #15

              @Lorence
              heh 9 mins is not considered late ;)

              then the list must be pointer type or it will be new ones and not the ones on screen.

              so
              std::array<Tile> should be std::array<Tile *> or std::array<Tile &>
              so its the ones on screen and not new ones
              Yes you must at least use & as it must "point" to the real one.

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              • L Offline
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                Lorence
                wrote on 22 Aug 2015, 18:36 last edited by Lorence
                #16

                then the list must be pointer type
                yea, i edited my last reply

                it will be new ones and not the ones on screen.

                it is the ones on the screen, there will be a list of tiles on the screen and the user will choose what tiles they want to render

                *so
                std::array<Tile> should be std::array<Tile > or std::array<Tile &>
                so its the ones on screen and not new ones
                Yes you must at least use & as it must "point" to the real one.

                thanks!!!!!!!!

                all my problem is fixed :) I have not coded for weeks and C++ is already kicking me damit

                M 1 Reply Last reply 22 Aug 2015, 18:38
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                • L Lorence
                  22 Aug 2015, 18:36

                  then the list must be pointer type
                  yea, i edited my last reply

                  it will be new ones and not the ones on screen.

                  it is the ones on the screen, there will be a list of tiles on the screen and the user will choose what tiles they want to render

                  *so
                  std::array<Tile> should be std::array<Tile > or std::array<Tile &>
                  so its the ones on screen and not new ones
                  Yes you must at least use & as it must "point" to the real one.

                  thanks!!!!!!!!

                  all my problem is fixed :) I have not coded for weeks and C++ is already kicking me damit

                  M Offline
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                  mrjj
                  Lifetime Qt Champion
                  wrote on 22 Aug 2015, 18:38 last edited by mrjj
                  #17

                  @mrjj said:
                  ok. Super :)

                  and tile_list is the ones to choose from ?

                  Dont worry. I programmed c++ for 20 years and it still kicks me ;)

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                  • L Offline
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                    Lorence
                    wrote on 22 Aug 2015, 18:43 last edited by
                    #18

                    and tile_list is the ones to choose from ?

                    yes, it is a list of Tile which is inheriting QLabel

                    Dont worry. I programmed c++ for 20 years and it still kicks me ;)

                    woaaaaa, me is about a year, and started this QT last week, i choose this for my tile engine's interface from SFML, i still have more ways to go !^_^

                    M 1 Reply Last reply 22 Aug 2015, 18:47
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                    • L Lorence
                      22 Aug 2015, 18:43

                      and tile_list is the ones to choose from ?

                      yes, it is a list of Tile which is inheriting QLabel

                      Dont worry. I programmed c++ for 20 years and it still kicks me ;)

                      woaaaaa, me is about a year, and started this QT last week, i choose this for my tile engine's interface from SFML, i still have more ways to go !^_^

                      M Offline
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                      mrjj
                      Lifetime Qt Champion
                      wrote on 22 Aug 2015, 18:47 last edited by
                      #19

                      @Lorence said:
                      welcome on board to Qt. its a nice frame work.

                      Oh so its some sort of game editor your are making ?

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                      • L Offline
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                        Lorence
                        wrote on 22 Aug 2015, 18:52 last edited by
                        #20

                        welcome on board to Qt. its a nice frame work.

                        Yes my first choice is wxwidget and windows form application, but signals and slots mechanism of qt makes me decide to choose qt

                        Oh so its some sort of game editor your are making ?
                        yes exatcly, like the rpg maker vx ace of steam

                        M 1 Reply Last reply 22 Aug 2015, 18:56
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                        • L Lorence
                          22 Aug 2015, 18:52

                          welcome on board to Qt. its a nice frame work.

                          Yes my first choice is wxwidget and windows form application, but signals and slots mechanism of qt makes me decide to choose qt

                          Oh so its some sort of game editor your are making ?
                          yes exatcly, like the rpg maker vx ace of steam

                          M Offline
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                          mrjj
                          Lifetime Qt Champion
                          wrote on 22 Aug 2015, 18:56 last edited by
                          #21

                          @Lorence
                          Well IMHO Qt is more feature rich than wxwidget even I did like that also.

                          Oh. Wow. thats a huge project. !
                          So its an editor and and tile engine for making tile games. Pretty cool.

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                            Lorence
                            wrote on 22 Aug 2015, 19:08 last edited by
                            #22

                            Well IMHO Qt is more feature rich than wxwidget even I did like that also.
                            yea, in other forum's debation, QT always win, whats IMHO?

                            Oh. Wow. thats a huge project. !
                            yes this is a huge project for me XD,
                            and i still got no idea about integrating script language into this project

                            M 1 Reply Last reply 22 Aug 2015, 19:12
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                            • L Lorence
                              22 Aug 2015, 19:08

                              Well IMHO Qt is more feature rich than wxwidget even I did like that also.
                              yea, in other forum's debation, QT always win, whats IMHO?

                              Oh. Wow. thats a huge project. !
                              yes this is a huge project for me XD,
                              and i still got no idea about integrating script language into this project

                              M Offline
                              M Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on 22 Aug 2015, 19:12 last edited by
                              #23

                              @Lorence
                              IMHO = In my humble opinion
                              Well I tested both and choose Qt.

                              Would also be huge for me to make as single person if we are talking full
                              game editor and engine :)

                              I would have a good look at http://doc.qt.io/qt-5/qtscript-index.html
                              Should be fast enough and quite easy to mix c++ and script.

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                              • L Offline
                                L Offline
                                Lorence
                                wrote on 22 Aug 2015, 19:16 last edited by
                                #24

                                I see

                                Im planning to finish this as in 100%

                                I would have a good look at http://doc.qt.io/qt-5/qtscript-index.html
                                Should be fast enough and quite easy to mix c++ and script.

                                thanks!

                                We have group on skype do you want to join?

                                M 1 Reply Last reply 22 Aug 2015, 19:24
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                                • L Lorence
                                  22 Aug 2015, 19:16

                                  I see

                                  Im planning to finish this as in 100%

                                  I would have a good look at http://doc.qt.io/qt-5/qtscript-index.html
                                  Should be fast enough and quite easy to mix c++ and script.

                                  thanks!

                                  We have group on skype do you want to join?

                                  M Offline
                                  M Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on 22 Aug 2015, 19:24 last edited by mrjj
                                  #25

                                  @Lorence
                                  ok. to make it a full product? To sell or make games and sell ?

                                  -- We have group on skype do you want to join?
                                  Oh thanks for the offer but I only use skype at work as I sit in the living room and
                                  taking in mics drives the others crazy :)
                                  So no Team Speak for me either :)

                                  So you are a group of people making this?

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                                  • L Offline
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                                    Lorence
                                    wrote on 22 Aug 2015, 19:29 last edited by
                                    #26

                                    ok. to make it a full project ? To sell or make games and sell ?
                                    I want to sell the whole project. i dont want wasting time doing things that is unrelated to programming so i dont want to make games and sell.

                                    okay i see np.

                                    So you are a group of people making this?
                                    No im the only one making this. the skype group is a group of programmers experts and newbies. just for teaching things

                                    M 1 Reply Last reply 22 Aug 2015, 19:44
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                                    • L Lorence
                                      22 Aug 2015, 19:29

                                      ok. to make it a full project ? To sell or make games and sell ?
                                      I want to sell the whole project. i dont want wasting time doing things that is unrelated to programming so i dont want to make games and sell.

                                      okay i see np.

                                      So you are a group of people making this?
                                      No im the only one making this. the skype group is a group of programmers experts and newbies. just for teaching things

                                      M Offline
                                      M Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on 22 Aug 2015, 19:44 last edited by
                                      #27

                                      @Lorence
                                      Ok, a game maker product.
                                      You should also consider how to handle support.
                                      Takes more time than one realizes.

                                      Ah, that way. Did not know skype has such forums/groups.

                                      Really good luck with it.

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                                      • L Offline
                                        L Offline
                                        Lorence
                                        wrote on 22 Aug 2015, 19:49 last edited by
                                        #28

                                        yea thanks.

                                        Ah, that way. Did not know skype has such forums/groups.
                                        oh no, im really bad at explaining things. i mean
                                        you can create a conversation group in skype and invite people as many as you can. so i just found this group and then i joined

                                        okay thanks again :)

                                        1 Reply Last reply
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                                        • S Offline
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                                          SherifOmran
                                          wrote on 9 Feb 2018, 17:17 last edited by
                                          #29

                                          my friends,i had a similar case and found this happens when you mix different versions of Qt to compile the project
                                          they simply change the ui_*.h files or sometimes they empty it and thus this happens. Occured at least with me ..

                                          1 Reply Last reply
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