Re: Interfacing cocoa/obj-c within a C plug-in API
Re: Interfacing cocoa/obj-c within a C plug-in API
- Subject: Re: Interfacing cocoa/obj-c within a C plug-in API
- From: Jean-Daniel Dupas <email@hidden>
- Date: Tue, 22 Dec 2009 11:16:12 +0100
Le 22 déc. 2009 à 10:56, Graham Cox a écrit :
>
> On 22/12/2009, at 10:22 AM, Rich E wrote:
>
>> Hi,
>>
>> I am new to Cocoa and Objective-C both, but I need the two in order to get
>> tablet functionality into one of my favorite applications (Puredata) on Mac
>> OS X. First off, I know that you can get tablet event data through the
>> Carbon API, but I have ran into enough problems (along with no 64-bit
>> support) that I think trying it with Cocoa is worth a shot. Puredata has an
>> API for writing plug-in's in C and I hear that it is possible to write the
>> entire plug-in in Obj-C but leave the host callback functions in standard C,
>> yet I still don't understand how to embark.
>>
>> I learn best by examples, does anyone know of any existing C applications
>> that make use of Cocoa or Objective-C? Else, any advice on how to combine
>> these two with a host written in C?
>
>
> The Carbon Event stuff is available in 64-bit, as far as I'm aware. Cocoa is built on it, so these lower-level parts of Carbon are very likely to remain available in 64-bit. It's mostly the higher level stuff, such as UI and legacy managers that are unavailable.
The fact that Cocoa uses a technology internally does not mean that it will remain an API. Most of Carbon event is SPI on 64 bits.
> Objective-C is a strict superset of C, so it may be freely intermixed with C code with few special considerations. Source files containing any Objective-C would end in .m, whereas pure C would end in .c, but you can put whatever C code you want into a .m file and it will be compiled as you'd expect. So for a plug-in with a pure C application interface that can remain as normal, but if you want to call Obj-C methods internally just make the source files .m instead and link against the usual Cocoa frameworks, and it should work.
>
> --Graham
>
-- Jean-Daniel
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