1.9 Ruby C Extension?

Ruby
1

Hi All,

When writing ruby extensions in C, how can I save C pointers into
ruby
variables Bignum or Fixnum?
The only Macros available are INT2FIX, INT2NUM & FIX2INT and NUM2INT. I
can
not save a pinter value that is 32 bits long.

example:

static VALUE round_trip(VALUE self, VALUE vptr)
{
void* ptr = NUM2INT(vptr);
return INT2NUM(ptr);
}

2

Alex K. wrote:

Hi All,

When writing ruby extensions in C, how can I save C pointers into
ruby
variables Bignum or Fixnum?
The only Macros available are INT2FIX, INT2NUM & FIX2INT and NUM2INT. I
can
not save a pinter value that is 32 bits long.

example:

static VALUE round_trip(VALUE self, VALUE vptr)
{
void* ptr = NUM2INT(vptr);
return INT2NUM(ptr);
}

I don’t think I’d do that. My inclination would be to create a structure
to hold the pointer and wrap the structure into a Ruby object.

3

On Thu, Aug 7, 2008 at 1:44 PM, Alex K. [email protected]
wrote:

{
void* ptr = NUM2INT(vptr);
return INT2NUM(ptr);
}

Um, yeah, that, that’s just wrong. What exactly are you trying to
accomplish with this extension?

In case you haven’t read it, please go read:
http://whytheluckystiff.net/ruby/pickaxe/, the chapter called
Extending Ruby

Jason