[MacRuby-devel] Accessing Obj-C InstVars from Ruby

[Edward Hynes]

Is there a way to access instance variables defined in an Objective-C  
class from a Ruby extension?  I'm porting some of Apple's example code  
to MacRuby as a learning experience and would like to do so  
incrementally.  Porting the code one class at a time works fine, but  
for some of the larger classes I'd like to port them a few methods at  
a time.  Here's an example of what's happening

--- Example.h ---

   @interface Example : NSObject {
       NSString *instVarA;
       NSString *instVarB;
    }

   - (NSString *)methodA;
   @end


--- Example.m ---

   #import "Example.h"

   @implementation Example
     - (id)init {
       if (self = [super init]) {
         instVarA = @"instVarA";
         instVarB = @"instVarB";
       }
       return self;
     }

     - (NSString *)methodA {
       return instVarA;
     }

   @end


--- Example.rb ---

   class Example
     def methodB
       @instVarB
     end
   end


Then at runtime, when I execute the following...

   example = Example.alloc.init
   puts example.methodA.inspect
   puts example.methodB.inspect


.. I get

   "instVarA"
   nil


How do I access InsVarB from Ruby?

Thanks,
Ed


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