Question

Answered: What is proper ruby ffi code for this function:

void glutInit(int *argc, char ** argv);

attach_function :glutInit, [:pointer, :pointer], :void

Answered: How to handle array of C-strings?
Like a pointer!

Still unanswered:How to change ARGV to match argument type?

If you know how to get “untouched” C argc and argv in Ruby script it would also helped (eg. python have special library for that, I’m not aware of anything similar for Ruby apart from ARGV).

Answer 1

here someone has written about this:
http://zegoggl.es/2009/05/ruby-ffi-recipes.html

you can use :varargs in your attach_function call, and when you call gluInit, you pass an array of type/value pairs.