qvariant_cast - can't retrieve custom class pointer from QML

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My QML code reads pointer of custom class and invokes C++ code with this pointer as a parameter.
Then qvariant_cast<MyClass*> returns it.
It works fine under Linux (GCC), but under Windows (mingw) doesn't. It returns just int value with address there.
I had declarations Q_DECLARE_METATYPE(MyClass*) in class header and qRegisterMetaType<MyClass*>("MyClass*") before cast is performed.

What I missing?

[SeeLook]

OK. Never mind...
I found the solution.
QML part read MyClass pointer from other C++ side, exactly as it is - underlying C++ returned bare <MyClass*>.
I changed that to QVariant::fromValue(myClassPtr) so now it is properly redirected further.
Poor Win by the way.