Register Qt type as meta type

PaulNewman

Can Qt types can be register in meta object system? I tried to register enum QtMsgType in class inherited from QObject with qobject macro and qenum macro and in class with qgadget. *QMetaEnum::enumName() returns nullptr in both cases but compiler doesnt say something about what i do wrong. QMetaObject::indexOfEnumerator returns -1 but i register type.

class Logging
{
    Q_GADGET
    Q_ENUM(QtMsgType);
...
public:
    void static messageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg);
// all other methods are static
}

void Logging::messageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
...
    auto metaEnum = QMetaEnum::fromType<QtMsgType>;
    auto value = metaEnum().enumName(); // nullptr
    auto variant = QVariant::fromValue(type); //null variant
...
}

gde23

when you want to use your own type as meta type you need to declare it as meta type with the macro

Q_DECLARE_METATYPE(YourType);

have you done that?

kshegunov

If your enum is contained in your class - use Q_ENUM and that's enough to declare it as metatype. Otherwise use Q_DECLARE_METATYPE as @gde23 said.

PaulNewman

@kshegunov i tried this too, it didnt work. I think your missed what my enum really is. It's not mine enum, its Qt enum.

kshegunov

@PaulNewman said in Register Qt type as meta type:

I think your missed what my enum really is. It's not mine enum, its Qt enum.

You're very much correct. Q_DECLARE_METATYPE should be the thing to go to in this case, but I'm curious, why do you want this as a metatype?

PS. You may want also to call qRegisterMetaType<QtMsgType>() to get the type registered, in addition to being declared.