On 9/6/06, Saumya D. [email protected] wrote:
def bad
puts ‘I am bad’
end
I want to include one of these methods from C code.
Since executing a script in this case will simply
Do nothing as I have defined singletons here.
How do I acheve It.
I beleive that this will work, none of this actually tested.
First, they’re not singleton methods, methods defined at the top level
are private instance methods of class Object. So you need to have a
receiver, but any object will do, say nil. As far as I can tell the
rb_funcall function doesn’t check whether or not a method is private,
but this might change in future versions of ruby.
So something like this might work to call the good method.
rb_funcall(Qnil, rb_intern("good"), 0)
if you instead made these class methods of a class:
class TestClass
def TestClass.good
puts ‘I am gud’
end
def TestClass.bad
puts 'I am bad'
end
end
Then in your C code you could do something like this (again untested):
VALUE test_class = rb_const_get(rb_cObject,
rb_intern(“TestClass”));
rb_funcall(test_class, rb_intern(“good”), 0, 0)
The last two arguments to rb_funcall are the number of arguments and
an array of the VALUEs of the arguments, since the count is 0 we can
use 0 for the array.
And if you made the methods instance methods:
class TestClass
def good
puts ‘I am gud’
end
def bad
puts 'I am bad'
end
end
Then your C code might look something like this (once again untested):
VALUE test_class = rb_const_get(rb_cObject,
rb_intern(“TestClass”));
VALUE test_instance = rb_class_new_instance(0,0,test_class)
rb_funcall(test_instance, rb_intern(“good”), 0, 0)
similarly here, the first two arguments of rb_class_new_instance are
the argument count and argument array for the initialize method.
–
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/