macOS How do I create and use Objective-C objects in a C++ program

[moonman239]

I'm looking to create a wrapper for Mac OS X's Location Services in pure C++. If I can do that, then I can create a Python module or a Ruby gem for accessing location services.

I have not found any information on this.

 

[moonman239]

OK, I just found some info:

https://juliankniephoff.wordpress.com/2012/09/22/revisiting-using-objective-c-objects-in-c-classes-in-the-age-of-arc/

What the author does is use a preprocessor directive to tell the Objective-C compiler to create an Objective-C class. I guess the question is now, "how do I use a preprocessor directive to wrap an existing class?"

 

[lee1210]

Look at RubyCocoa. You should be able to skip a few steps and use LocationServices more directly from ruby.

-Lee

 

[kamy]

In one of our projects We have used 'C' functions to talk to 'Objective C' functions to do the Mac UI stuff.
From C++ layer we just invoke the C functions.

 

[moonman239]

Does anyone know if I can rely on .mm files to create relays between Objective-C and C++?

 

[chown33]

Does anyone know if I can rely on .mm files to create relays between Objective-C and C++?

A .mm file is Objective-C++. You should look it up if you're not sure what that means. For example:
http://en.wikipedia.org/wiki/Objective-C++#Objective-C.2B.2B

There are more extensive references on Apple's developer website, but you might need to search outside of Apple to find older references.


I don't understand what you mean by "relays", at least in the context of Objective-C++.