The following snippet of C code shows my attempt to create a Ruby
string object by invoking the “new” method on the Ruby String class.
I know it would be easier to do this using the rb_str_new or
rb_str_new2 functions. However, I’m trying to understand how to
create arbitrary Ruby objects from C using the “new” method. Can you
spot what’s wrong with this code?
ID class_id = rb_intern(“String”);
VALUE stringClass = rb_const_get(rb_cClass, class_id); // wrong
1st parameter?
ID method_id = rb_intern(“new”);
VALUE s1 = rb_funcall(stringClass, method_id, 1, “test”);
printf(“s1 = %s!\n”, RSTRING(s1)->ptr);
On Mar 10, 2007, at 11:11 PM, Mark V. wrote:
ID method_id = rb_intern(“new”);
VALUE s1 = rb_funcall(stringClass, method_id, 1, “test”);
printf(“s1 = %s!\n”, RSTRING(s1)->ptr);
I think I found the answer. Using rb_class_new_instance works and is
much simpler that what I was attempting.
On Mar 10, 2007, at 9:11 PM, Mark V. wrote:
The following snippet of C code shows my attempt to create a Ruby
string object by invoking the “new” method on the Ruby String
class. I know it would be easier to do this using the rb_str_new or
rb_str_new2 functions. However, I’m trying to understand how to
create arbitrary Ruby objects from C using the “new” method. Can
you spot what’s wrong with this code?
require ‘rubygems’
require ‘inline’
class X
def initialize
puts “blah”
end
end
class Y
inline do |builder|
builder.c ’
VALUE blah() {
return rb_funcall(rb_path2class(“X”), rb_intern(“new”), 0);
}’
end
end
p Y.new.blah
% ./blah.rb
blah
#<X:0x1090ec4>