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Qt Widgets under iOS with projector

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  • GerhardG Offline
    GerhardG Offline
    Gerhard
    wrote on last edited by A Former User
    #1

    Dear all,

    Can one of you possibly help me with following problem:

    I have built an iOS-App with QT-Widgets-Framework (Qt 5.6) . The App runs without any problems on my iPad.

    I would like to connect the iPad with an external monitor / projector via “Lighning – VGA – Adapter” in order to present the App on a bigger scale.

    Before I start my App, the whole iPad screen is mirrored on the external screen.

    However, as soon as I start the App, the external screen turns black.

    I have tried to localize the problem.

    After the QApplication initialization the screen turns blank.

    Unfortunately I do not have a clue how to solve this issue – Does one of you have an idea?

    Maybe special parameters for initialization are to be set? If so, what / which are these?

    Thanks a lot

    Gerhard

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    • mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi
      That sounds very odd.
      Did you test with other non Qt apps to check it does work ?

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #3

        Hi,

        Might be related to QTBUG-56768.

        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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        • GerhardG Offline
          GerhardG Offline
          Gerhard
          wrote on last edited by
          #4

          Hi,

          is there any workaround ?

          Gerhard

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          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #5

            Not that I know of yet, sorry.

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

            mrjjM 1 Reply Last reply
            0
            • SGaistS SGaist

              Not that I know of yet, sorry.

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #6

              @Gerhard
              It seems it works with Qt 5.5.
              "Doing the same thing with Qt5.5 works."

              So that is the only workaround. Using that version.

              1 Reply Last reply
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