Re: [Pyobjc-dev] Catergory Question ...

[Mic P. <mic...@gm...>]

Hi Ronald,

I'm still having issues with this. My category is defined in the file
NSStringTextile.py as follows ...

from Foundation import *
import objc
import textile

class NSString(objc.Category(NSString)):

	@objc.signature('#:#')
	def stringFromTextile_(self, aString):
		try:
			data = textile.textile(aString)
		except:
			data = ''
		return data

And my header file, NSStringTextile.h, as follows ...

#import <Cocoa/Cocoa.h>

@interface NSString (Textile)

+ (NSString *)stringFromTextile:(NSString *)aString;

@end

However, when ever I try to use the category I get the following
message box popup ...

[NSString stringFromTextile:]: unrecognized selector sent to class 0xa0839f20

I have also added my python file to main.py

Any ideas on where I'm going wrong ?

Cheers

-Mic

2009/5/8 Ronald Oussoren <ron...@ma...>:
>
> On Friday, May 08, 2009, at 10:59AM, "Mic Pringle" <mic...@gm...> wrote:
>>Hi,
>>
>>Just a quick question regarding categories.
>>
>>I have a hybrid Obj-c/PyObj-c application and I'd like to know if I
>>add a category in a PyObj-c module, will it be availble to use in the
>>Obj-c side of the project ??
>>
>>If so, does it just work or are there any special instructions I need
>>to follow to get it working ?
>
> Methods you add using an Python category are available in ObjC as well (the same is true for methods you add in a subclass, those can be called from ObjC as well).
>
> Two possible sources for confusion/problems:
>
> * Unless the methods you add are already known to the compiler you'll have to write a header file that the ObjC compiler
>  can use. You'll get compiler warnings otherwise.
>
> * Methods that you add in python by default have arguments and a return value of type 'id'. This can be overridden by:
>
>   - information extracted from the superclass (if you override a method PyObjC knows the new method should have the
>     same signature as the one in a superclass).
>   - the method is defined in an informal_protocol that's known to PyObjC, the method signature is then extracted from
>     that protocol
>   - manual annotations (objc.accessor, objc.selector, ....)
>
> Ronald
>>Thanks
>>
>>-Mic
>>
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