<![CDATA[Signal and slots qRegisterMetaType]]>Hi guys,

I'm having a strange problem with some custom typedefs i have defined for smart pointers e.g:
@
namspace example
{
typedef
smartPointer;
}@

Then a qthead that emits a signal of this type back to a class that runs on the main gui thread:

@namspace example
{
class thread : public QThread
{
Q_Object

   public signals:
  void  send(smartPointer);

}
}@

Hopefully this short example makes sense.

I have registered this typedef with the @qRegisterMetaTypeexample::smartPointer(smartPointer);@

class, and also the QDECLARE_METATYPE(example::smartPointer) macro.

However in runtime I get a "cannot queue arguments of type example (Make sure 'example' is a registered using qRegisterMetaType().)" error.

any sugestions would be great

]]>https://forum.qt.io/topic/21196/signal-and-slots-qregistermetatypeRSS for NodeFri, 14 Aug 2026 15:04:20 GMTWed, 07 Nov 2012 14:22:39 GMT60<![CDATA[Reply to Signal and slots qRegisterMetaType on Mon, 12 Nov 2012 23:42:47 GMT]]>You seem to be missing something in your typedef. I'll assume this is something like
@typedef SomeGiantTypeThatIDontWantToRetypeOrWhatever SmartPointer;@

qRegisterMetaType takes a string name of your class e.g. @qRegisterMetaTypeexample::SmartPointer("SmartPointer")@

You can call it wherever just as long as your typedef is visible there and before you use it for connecting or access its metadata.
Also, make sure you use Q_DECLARE_METATYPE outside of your example namespace.

]]>https://forum.qt.io/post/156834https://forum.qt.io/post/156834Mon, 12 Nov 2012 23:42:47 GMT<![CDATA[Reply to Signal and slots qRegisterMetaType on Wed, 07 Nov 2012 21:22:52 GMT]]>[quote author="Suths" date="1352298159"]
I have registered this typedef with the @qRegisterMetaTypeexample::smartPointer(smartPointer);@
class[/quote]

Where exactly do you call that function?

]]>https://forum.qt.io/post/156337https://forum.qt.io/post/156337Wed, 07 Nov 2012 21:22:52 GMT