From: Jason Roelofs <jameskilton@...>
Date: 2009-01-23T04:28:02+09:00
Subject: Re: Calling class methods from C

Bah, saw a small issue right when I hit "Send".

My call line works for a class defined as such:

class CallTest
   def self.go
      (do something here)
   end
end

If you need to call an instance method on an instance of the class
CallTest, you need to of course get a hold of that instance, or make a
new one:

VALUE obj = rb_funcall(rb_const_get("CallTest"), rb_intern("new"), 0);
rb_funcall(obj, rb_intern("go"), 0);

Jason

On Thu, Jan 22, 2009 at 2:19 PM, Jason Roelofs <jameskilton@gmail.com> wrote:
> From the top of my head:
>
> rb_funcall(rb_const_get("CallTest"), rb_intern("go"), 0);
>
> And if you're calling "global" methods, it's better to call it on
> Kernel, where the methods are defined anyway:
>
> rb_funcall(rb_mKernel, rb_intern("method_name"), args);
>
> Hope that helps.
>
> Jason
>
> On Thu, Jan 22, 2009 at 2:11 PM, Robert Rouse <scyllinice@scyllinice.com> wrote:
>> Hello,
>>
>> I'm trying to call a class method from C. I've tried all combinations of
>> rb_intern I could think of to make it work, but I've gotten nothing.
>>
>> Example class
>>
>> class CallTest
>> def go
>> (do something here)
>> end
>>
>> end
>>
>> rb_funcall(?, rb_intern("go"), 0);
>>
>> What goes in the ? space? I know if I use Qnil there, it will call
>> global functions, but I'd prefer class methods.
>>
>> Am I heading in the wrong direction?
>>
>> Also, I'd prefer not to have to know the class name ahead of time if
>> possible, but if I have to require that I know what it is, I can try
>> passing it by name to my application.
>>
>> I'm using SWIG to generate the binding.
>> --
>> Posted via http://www.ruby-forum.com/.
>>
>>
>