[Interest] metaObject from class name

[Graham Labdon]

Ok Thanks

From: Keith Gardner [mailto:kreios4004 at gmail.com]
Sent: 14 February 2014 15:21
To: Jason H
Cc: Graham Labdon; interest at qt-project.org
Subject: Re: [Interest] metaObject from class name

If you register the class with QMetaType with Q_DECLARE_METATYPE(Class*), you can then call QMetaType::type("Class").  With the returned int, you can then call QMetaType::metaObjectForType(integer).  I think this is what you are looking for.

class Foo : public QObject
{
    ...
};
Q_DECLARE_METATYPE(Foo*)

const char *string = "Foo";
const QMetaObject* metaObject = QMetaType::metaObjectForType(QMetaType::type(string));

I haven't tried compiling this but I believe this is how it will work based off of the docs for QMetaType.

Keith


On Fri, Feb 14, 2014 at 9:14 AM, Jason H <scorp1us at yahoo.com<mailto:scorp1us at yahoo.com>> wrote:
I'm not 10% udnerstanding your intentions, but this might help. You can create any QObject through QMetaObject by the class name, then get the meta object for the created object. Look at QMetaObject::newInstance(..)

You need a "class factory" design pattern.

Here is an example:
http://www.ics.com/designpatterns/solutions/abstractfactory.html#abstractfactoryh


________________________________
From: Graham Labdon <Graham.Labdon at avalonsciences.com<mailto:Graham.Labdon at avalonsciences.com>>
To: "interest at qt-project.org<mailto:interest at qt-project.org>" <interest at qt-project.org<mailto:interest at qt-project.org>>
Sent: Friday, February 14, 2014 5:50 AM
Subject: [Interest] metaObject from class name


Hi
In my application I have a class name as a string
This is the name of a class derived from QObject.
Now what I would like to do is the get metaObject for this class from the string

Is this at all possible?

Many thanks

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