How to pass custom class reference to QMetaObject::invokeMethod

[Asperamanca]

@SJoshi
You need to register the class using Q_DECLARE_METATYPE or (in rare cases) qRegisterMetaType()

[SJoshi]

@Asperamanca Thanks for replying but even using the Q_DECLARE_METATYPE I am getting this : QMetaObject::invokeMethod: No such method demo(ABC*).

Or maybe I am using it in a wrong way as I am new to this can you please help me out with this.

[jsulm]

@SJoshi said in How to pass custom class reference to QMetaObject::invokeMethod:

for which I have created its reference here

You created a pointer, not reference.

Where is this demo() method actually defined?
Because you have to pass pointer to class instance to invokeMethod() where demo() is defined.

[SJoshi]

@jsulm Hi I am sorry that I used reference word, actually, demo() is on some another class I didn't mention it on here and it's a public slot too. Also, I have passed the actual object of the class where the demo is put instead of this. But I don't know where I am doing the mistake.

[jsulm]

@SJoshi Please post code you're really using and show how you registered ABC.

[SJoshi]

@jsulm Sure actually it's a bit complex code so I am just sharing the main logic with you :

Q_DECLARE_METATYPE(ABC*)

void MainWindow::senData() {

ABC* temp;

some logic applied on temp

QMetaObject::invokeMethod(pv, "demo", Qt::QueuedConnection, Q_ARG(ABC*, temp), Q_ARG(bool, false))

...

}

In the above logic PV is an object pageView class and created as: pageView* pv = new PageView().

void pageView::demo(ABC* obj, bool handle) {

...

}

Error : QMetaMethod::invoke: Unable to handle unregistered datatype 'ABC*

Please let me know If I am missing something.

[Asperamanca]

This post is deleted!

[Asperamanca]

@SJoshi Can you add the include statements prior to Q_DECLARE_METATYPE?
Also, do you use namespaces?

[SJoshi]

@Asperamanca Yes I declared Q_DECLARE_METATYPE just after the include statements and I'm not using any namespaces.

[VRonin]

You already have the answer at hand

@SJoshi said in How to pass custom class reference to QMetaObject::invokeMethod:

Unable to handle unregistered datatype 'ABC*

@Asperamanca said in How to pass custom class reference to QMetaObject::invokeMethod:

You need to register the class using [...] qRegisterMetaType()

[SJoshi]

@VRonin Thanks It worked for me but I have a small doubt what's a suitable place to use qRegisterMetaType. For now, I have used it on the very first line of MainWindow::senData() method.

[Christian Ehrlicher]

@SJoshi said in How to pass custom class reference to QMetaObject::invokeMethod:

For now, I have used it on the very first line of MainWindow::senData() method.

There is no need to re-register it every time. The ctor of this class is fine.

[SJoshi]

@Christian-Ehrlicher Thank You!