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QApplication crashes when aboutQt dialog is closed.

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  • W Offline
    W Offline
    Wowalive
    wrote on last edited by
    #1

    Hi there,

    I'm showing the aboutQt dialog in my App using QApplication::aboutQt(). Unfortunately everytime when I close this dialog my app crashes.

    I've connected it to QML and calling it via simple Signal-Slot-connection:

    connect(this, SIGNAL(qtAboutScreen()), qApp, SLOT(aboutQt()));
    

    The class which is connected to QApplication inherits from QObject. Is there any Problem? Or do you know other, better solutions to display Qt information in qml?

    Greetings,
    wowalive

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    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #2

      When the program crashes you can take a look what the debugger tells you. From your code above we can't say anything about what's going wrong. So provide more code, the best would be a minimal, compilable example to show your problem.

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
      Visit the Qt Academy at https://academy.qt.io/catalog

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      • W Offline
        W Offline
        Wowalive
        wrote on last edited by
        #3

        There is no output except the "program has unexpectedly finished" message. The debugger gets stuck in Disassembler (QV4::ExecutionEngine::newString(QString const&)).

        I'm doing nothing else than connecting a signal to the QApplication::aboutQt() slot. After closing the About Dialog the error appears.

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        • Christian EhrlicherC Offline
          Christian EhrlicherC Offline
          Christian Ehrlicher
          Lifetime Qt Champion
          wrote on last edited by
          #4

          QV4 looks like QML somwhere.
          Reduce you app until it no longer crashes, the connect is for sure not the problem.

          Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
          Visit the Qt Academy at https://academy.qt.io/catalog

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          • W Offline
            W Offline
            Wowalive
            wrote on last edited by
            #5

            Ok it was my fault. I've used a Q_INVOKABLE method which should return a QString but returned nothing.

            Nevertheless I didn't used the QApplication::aboutQt() function to show the licensing information, because it opens a dialog with a completely different look and feel (QWidget).

            Instead I created a Qml Popup and used QT_VERSION_STR to get the current qt version.

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