[Qt-interest] Meta Object for Class Name?

[Sean Harmer]

Josiah Bryan wrote:
> Sean Harmer wrote:
>   
>> Josiah Bryan wrote:
>>     
>>> Is there a way to get the meta object for a class given the class name 
>>> (assuming its a QObject, of course.)
>>>
>>> Ideally, I'd like to be able to construct a class just from its name, say:
>>>
>>> FooBar *foo = (FooBar*) QMetaObject::defaultConstructor("FooBar");
>>>
>>> Is that pie-in-the-sky or is that somehow possible?
>>>   
>>>       
>> I think you are after QObject* QMetaObject::newInstance():
>>
>> http://doc.trolltech.com/4.6-snapshot/qmetaobject.html#newInstance
>>
>>     
>
> Awesome! Thanks, Sean. Maybe I'm blind, but I didn't see anything in the 
> docs where I can get the QMetaObject for a class name, e.g. something like:
>
> static QMetaObject * QMetaObject::metaObject(const char * className);
>
> Any ideas if thats possible or not?
>   
I am not aware of any way of doing this directly. Take a look in the 
Q_OBJECT macro maybe something gets written in there that allows this?

One possibility would be to use the QObject::metaObject() or 
QObject::staticMetaObject() functions depending on if you already have a 
pointer to an object of yoru QObject class or not.

You could always insert pointers to yoru meta objects into a global 
QHash<QString,QMetaObject*> container and do the lookup using that. Just 
an idea. Others may have a better method(s).

It would be nice to have a static QMetaObject* QMetaObject::metaObject( 
const char* ) method though.

Cheers,

Sean
> Thanks!
> -josiah
>
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