How to use Obj-C classes in MacRuby

Question

I am trying to use an external Obj-C class in my MacRuby project, but I can't figure out how to import it. Specifically, I want to use ObjectiveResource inside a MacRuby 0.5 project (since ActiveResource doesn't work - yet).

I have gotten as far as the 'framework' command in MacRuby, but it only seems to apply to actual frameworks.

Questions: where should I install the objective-resource directory? how do I pull these classes inside my ruby code?

Thanks for any help!

Answer 1

Did you look at this example of creating an ObjC bundle?

Answer 2

You can access the class directly using ClassName.new.

If you have a class named Utilities in your project and it has a method named greeting:, you would call it like so.

util = Utilities.new
puts util.greeting("Good morning")

There is no require or framework declarations required. Amazingly simple isn't it. I discovered this watching the Peepcode screencast on MacRuby.

Answer 3

Also, if you are interested in calling Ruby code from Objective-c, here is an extract from the MacRuby mailing list:

Once the MacRuby runtime is initialized, you can access all your Objective-C objects from Ruby. For example, if you have an Objective-C class named Foo, you can do `Foo.new', etc.

Another possibility is to pass your Objective-C objects to a Ruby method by using -[NSObject performRubySelector:].

ruby: class Foo def test(o) o.something end end

objc: MyObject *o = [MyObject new]; // where o responds to -something MacRuby *runtime = [MacRuby sharedRuntime]; id foo_obj = [runtime evaluateString:@"new Foo"]; [foo_obj performRubySelector:@selector(test:) withArguments: o, NULL];

Check out the whole API here: http://www.macruby.org/trac/browser/MacRuby/trunk/include/ruby/objc.h

Thread: http://lists.macosforge.org/pipermail/macruby-devel/2010-April/004715.html

Answer 4

hi , I created a custom cocoa bundle. But when i try to load the bundle into MacRuby project,I get the following err

dyld: Library not loaded: audio_streamer.bundle Referenced from: /Users/sgopinath/workspace002/UplayaDesktopRadio/build/Debug/UplayaDesktopRadio.app/Contents/MacOS/UplayaDesktopRadio Reason: image not found

I created the bundle using the following command gcc audio_streamer.m -o audio_streamer.bundle -g -framework Foundation -dynamiclib - fobjc-gc -arch i386 -arch x86_64

I could load the bundle from macirb , but not from actual xcode project which is intended to use it.

Any suggestions

Thankyou sgopinath