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

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

Thankyou all so much. Between Bob and Ronald I now have this working.

-Mic

2009/5/10 Ronald Oussoren <ron...@ma...>:
>
> On 8 May, 2009, at 13:44, Mic Pringle wrote:
>
>> Okay, fantastic !
>>
>> Would it be possible for you to give me an example of your last point
>> (re: manual annotations for some method you may use in a category) as
>> this is the only part I don't have any experience with ?
>>
>> I am looking to add two methods to NSString, one which returns a
>> string and another which returns an array.
>>
>> This would be greatly appreciated.
>
> Both strings and arrays are objects and hence no manual annotation is
> needed, something like this should work:
>
> class MyStringCategory (objc.Category(NSString)):
>     def myStringValue(self):
>          return u"hello"
>
>     def myArrayValue(self):
>          return [1,2]
>
>
> You only need manual annotations when an argument or return value is a basic
> C type (such as a C "int" or "NSPoint"). Adding annotations is described in
> the pyobjc documentation and is definitely advanced behaviour because it
> uses some very lowlevel machinery.
>
>
> Ronald
>>
>> Thanks
>>
>> -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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>>>
>
>