The error I get related to Qapplication/ , I am using conda env and error i get is "QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled qt.qpa.backingstore: composeAndFlush: makeCurrent() failed QXcbIntegration: Cannot create platform offscreen surface, neither GLX nor EGL are enabled" distribution running on my machine PRETTY_NAME="Ubuntu 24.04.3 LTS" NAME="Ubuntu" VERSION_ID="24.04" VERSION="24.04.3 LTS (Noble Numbat)" VERSION_CODENAME=noble ID=ubuntu ID_LIKE=debian HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" UBUNTU_CODENAME=noble LOGO=ubuntu-logo For Qt Python 3.8.20 (default, Oct 3 2024, 15:24:27) [GCC 11.2.0] :: Anaconda, Inc. on linux Type "help", "copyright", "credits" or "license" for more information. from PyQt5.QtCore import QLibraryInfo print("Qt version:", QLibraryInfo.version().toString()) Qt version: 5.15.2 print("Prefix path:", QLibraryInfo.location(QLibraryInfo.PrefixPath)) Prefix path: /home/rmunusamy/miniconda3/envs/hpe print("Library path:", QLibraryInfo.location(QLibraryInfo.LibrariesPath)) Library path: /home/rmunusamy/miniconda3/envs/hpe/lib I am running on wayland echo $XDG_SESSION_TYPE wayland So , prepended env variable QT_QPA_PLATFORM=wayland then, the script. i get this warning Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway. qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in "" This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: eglfs, minimal, minimalegl, offscreen, vnc, webgl, xcb.

Today there is only a single pretty expensive license. But in the past, I remember there were other cheaper versions. For example the "Indie Mobile Edition". So a edition only for mobile devices (and i guess only Qt5 only, but I am not 100% sure). I guess they have one of that versions and/or they use a module that isn't available with Qt6 yet (don't forget that some modules are not available with Qt6!) But maybe ask them if you want to know more.

In QT Design Studio, Tab Buttons are mostly for navigation within the UI, but each tab doesn’t automatically hide other content. Usually, a StackView or Loader is needed to switch visible content depending on the active tab.

@IamSumit can you reproduce the issue and share the Support Information logs. Please refer to the following Knowledge Base Article regarding how to obtain the Support Information is https://qatools.knowledgebase.qt.io/misc/collecting-support-info/collecting-support-information-linux-mac-windows/

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I do a lot of python/pyqt database access using psycopg2 for PostgreSQL. It's so much easier to prototype these kinds of ideas in a language like python, and if needed then port it to c++, but truth be told, most of the time the python app is just works as is so no need to rewrite in c++. For something as simple as you are alluding to, the hard core OO models using DAO/DTO are probably overkill. Also, when dealing qith SQL queries it's "nice" to work in a language that is NOT strongly typed. Sorry if this is a round-about way to respond. Your path has merit in the realm of intellectual curiosity, but if you want it done quickly then python is a better option, and you can still wrap it in a Qt GUI. Yikes! Didn't notice OP was 9 months ago...

Bonjour, Dans votre fonction, call, le device est détruit à la fin de la fonction, Le signal signalWithoutPointer ne peut pas marcher car cela demanderai un copy de l'objet Device mais il s'agit d'un QObject ou le constructeur par copy est désactivé. Le passage d'un pointeur vers Device, ben, la moment juste après le pointeur est null. Le passage avec signal sur pointeur "pointer", lui il marche mais c'est la responsabilité de la classe connection de détruire pointer (et donc de garder une variable dessus). Le plus simple c'est de faire un retour de fonction si vous voulez vous simplifiez la vie. // in Connection.cpp Device* Connection::call() { return new Device("Pointeur"); } //main.qml (à la place de la Connections) property Device device: Connection.call() Dans ce cadre cas là, par passage par pointer via un retour de fonction, l'objet appartiendra au QML et sera détruit par le QML Engine. Cependant, je recommande plutot de passer par une propriété. // in connection.h // je suggère de renommer cette classe en ConnectionController (pour éviter la confusion avec le type qml Connections class Connection : public QObject { Q_OBJECT Q_PROPERTY(Device* device READ device CONSTANT) public: explicit Connection(QObject *parent = nullptr); Device* device() const; private: std::unique_ptr<Device> m_device; }; // in connection.cpp Connection::Connection(QObject *parent) : QObject(parent), m_device(new Device("Pointeur"){} Device* Device::device() const { return m_device.get(); } // main.qml property Device device: Connection.device Ici le device reste la responsabilité de la classe Connection, mais c'est géré par le uinique_ptr. Si le device peut changer, il conviendra d'ajouter un signal deviceChanged et de supprimer le CONSTANT de la Q_PROPERTY pour y mettre un "NOTIFY deviceChanged".

Everything looks right in my eyes. If I e.g. search for @Volker-Hilsheimer's blog post about QRangeModel, I'll find it here. Do you have a specific link for me to check?