[Qt-interest] QMetaType::type succeeds or fails seemingly

[Schimkowitsch Robert]

I can't use qRegisterMetaType<MyType>(), because I don't know the type
at compile time.

The type is defined inside a library, and I only get it by iterating
through the properties of a QObject-based class defined within that
library.

My test code knew the type, but that was just test code.
In my real app, I try to set the properties of an unknown QObject-based
class from an input XML file.
I iterate through all properties. If they are an enumeration type, I get
the QMetaEnum information. If the string from the XML file matches any
of the enum keys, I assign the enum that value.

What would really help me would be some method I could call on the
QObject that would ensure all DECLARE_METATYPE enums related to that
object are resolved.

Kind Regards

Robert Schimkowitsch

-----Original Message-----
From: qt-interest-bounces+robert.schimkowitsch=andritz.com at qt.nokia.com
[mailto:qt-interest-bounces+robert.schimkowitsch=andritz.com at qt.nokia.co
m] On Behalf Of Thiago Macieira
Sent: Wednesday, September 28, 2011 10:31 AM
To: qt-interest at qt.nokia.com
Subject: Re: [Qt-interest] QMetaType::type succeeds or fails seemingly

On Wednesday, 28 de September de 2011 10:15:34 Stefan Majewsky wrote:
> On Mon, Sep 26, 2011 at 4:50 PM, Schimkowitsch Robert
> 
> <Robert.Schimkowitsch at andritz.com> wrote:
> > Which brings up the question: When does Q_DECLARE_METATYPE run, and
how
> > do I make it run?
> 
> Looking at the definition of Q_DECLARE_METATYPE, in
> include/QtCore/qmetatype.h, you should be able to "make it run" by
> 
>     (void) QMetaType<MyType>::qt_metatype_id();
> 
> before the QMetaType::type() call. I don't know about the ABI
> stability policy for this macro, but I think this should be
> binary-compatible until at least Qt 5.

You can use the documented way:
	qRegisterMetaType<MyType>();

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center
      PGP/GPG: 0x6EF45358; fingerprint:
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