Re: C callbacks with NSNotificationCenter?
Re: C callbacks with NSNotificationCenter?
- Subject: Re: C callbacks with NSNotificationCenter?
- From: Fritz Anderson <email@hidden>
- Date: Wed, 07 Sep 2016 11:35:26 -0500
> On 7 Sep 2016, at 11:09 AM, Andreas Falkenhahn <email@hidden> wrote:
>
> As a C programmer I'm trying to avoid Objective C whenever and wherever possible.
> The good thing is that I can do most interaction with Cocoa from normal C functions.
> I only had to write very few classes. Most of the Cocoa stuff can be done
> from normal C functions just fine.
I shall little more than observe that “C programmer” is an odd definition of a professional identity. To my ear (not knowing you well), it’s like saying “I drink liquids.”
I kind of get it, as I claim an identity as an Apple-platform developer, but I’d argue it describes a different kind of expertise, and in my case a strong political tendency. Drawing the line at C surprises me.
Now let me actually respond to what you wrote.
> Still, I'm wondering: Is it also possible to have NSNotificationCenter call
> a C function for me whenever the notification triggers? Can this somehow
> be achieved or am I forced to use full Objective C here?
NSNotificationCenter has a method in the form of addObserver: ... using:, which takes a block. Blocks can contain pure C. I’d bet you’d normally consider anything gcc accepts (as an extension to the C parser) to be your idea of C.
The older form takes a selector. Selectors are keys for dispatching through an Objective-C class to its methods. I know of no supported way to dispatch a method selector without a class to select the method from. (Unless you hack the C runtime by… reimplementing the Objective-C runtime and hoping you’ve covered all architectures and runtimes.)
— F
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