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Error with libqxcb.so

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libqxcb.so
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  • J Offline
    J Offline
    Jaeheon Chung
    wrote on last edited by
    #1

    What libqxcb.so role is?

    I have an error when no monitor(screen)

    I developed my application with lubuntu on UP Board like rasberrypi(url: http://up-shop.org/up-boards/44-up-board-4gb-ram-64-gb-emmc.html)

    My application is working well when connected monitor but isn't working when no monitor.

    The error message is "segfault at 18 ip 0007f25f2a17703 sp 00007ffe1e5b0fe0 error 4 in libqxcb.so[0007f25f29ba000+12c000]".

    Anybody helps me..

    1 Reply Last reply
    0
    • VRoninV Offline
      VRoninV Offline
      VRonin
      wrote on last edited by
      #2

      that plugin takes care of communicating with the X window system on linux. Are you using QWidgets on a platform that has no windowing system?

      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
      ~Napoleon Bonaparte

      On a crusade to banish setIndexWidget() from the holy land of Qt

      J 1 Reply Last reply
      0
      • VRoninV VRonin

        that plugin takes care of communicating with the X window system on linux. Are you using QWidgets on a platform that has no windowing system?

        J Offline
        J Offline
        Jaeheon Chung
        wrote on last edited by
        #3

        @VRonin yes.. you mean if I use application with no windowing system, eliminate every class based on QWidget?

        VRoninV 1 Reply Last reply
        0
        • J Jaeheon Chung

          @VRonin yes.. you mean if I use application with no windowing system, eliminate every class based on QWidget?

          VRoninV Offline
          VRoninV Offline
          VRonin
          wrote on last edited by
          #4

          @Jaeheon-Chung said in Error with libqxcb.so:

          eliminate every class based on QWidget

          Disclaimer: I cannot guarantee that what I'm about to say is accurate

          you can either:

          • create a platform plugin that works on your platform (as, clearly, the X plugin can't)
          • you remove any link to the widgets module

          However, since it's just a plugin loading, you might get away with linking to the widgets module as long as you do not use QWidgets inside your application

          "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
          ~Napoleon Bonaparte

          On a crusade to banish setIndexWidget() from the holy land of Qt

          J 1 Reply Last reply
          0
          • VRoninV VRonin

            @Jaeheon-Chung said in Error with libqxcb.so:

            eliminate every class based on QWidget

            Disclaimer: I cannot guarantee that what I'm about to say is accurate

            you can either:

            • create a platform plugin that works on your platform (as, clearly, the X plugin can't)
            • you remove any link to the widgets module

            However, since it's just a plugin loading, you might get away with linking to the widgets module as long as you do not use QWidgets inside your application

            J Offline
            J Offline
            Jaeheon Chung
            wrote on last edited by
            #5

            @VRonin
            Is there any method to make virtual screen for xwindow?
            I think the method what you suggested will take a long time to fix my application..

            A 1 Reply Last reply
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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Hi,

              Depending on your needs, maybe the offscreen backend could be enough.

              Hope it helps

              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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              • J Jaeheon Chung

                @VRonin
                Is there any method to make virtual screen for xwindow?
                I think the method what you suggested will take a long time to fix my application..

                A Offline
                A Offline
                ambershark
                wrote on last edited by
                #7

                @Jaeheon-Chung said in Error with libqxcb.so:

                @VRonin
                Is there any method to make virtual screen for xwindow?
                I think the method what you suggested will take a long time to fix my application..

                What widgets do you need in a headless environment? There is nothing a user could interact with so removing QWidgets should be pretty easy to do.

                My L-GPL'd C++ Logger github.com/ambershark-mike/sharklog

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