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QML can't call static member function of C++ class



  • C++ header file:

    class Worker: public Object
    {
    Q_OBJECT
    public:
         explicit Worker(QObject *parent = nullptr);
        Q_INVOKABLE static Worker fromJsonString(const QString &jsonString);
    }
    

    register Worker class type in my main.cpp:

    qmlRegisterType<Worker>("com.abc", 1, 0, "Worker");
    

    qml file:

    import com.abc 1.0
    var worker = Worker. fromJsonString(jsonString) 
    

    when I run the program, output following error message:

    TypeError: Property 'fromJsonString' of object [object Object] is not a function
    

    what wrong with my code?



  • @Jazzy You miss to add Q_OBJECT and to declare fromJsonString() as public::

    class Worker: public Object
    {
        Q_OBJECT
    
    public:
         explicit Worker(QObject *parent = nullptr);
        Q_INVOKABLE static Worker fromJsonString(const QString &jsonString);
    }
    

  • Qt Champions 2018

    You need an instance of an object to call a function in QML, so a static function doesn't make a lot of sense in QML.

    In your case you might want a singleton type acting as a Worker factory.



  • @KroMignon whether I am wrong, it is said that your cold in the same with his, both have symbol Q_OBJECT.


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