From: "Niklas C." <cathor.niklas@...>
Date: 2008-04-29T09:51:12+09:00
Subject: converting strings in c extension

While trying to bind some old C code to ruby I ran into trouble
converting strings. The function in question requires two string
arguments (const char*). This is the relevant part of my binding:

...
static VALUE rb_ldist(VALUE s, VALUE t)
{
  return INT2FIX(ldist(StringValuePtr(s),StringValuePtr(t)));
}
...

Compilation works without warnings, but when I try to use the function
in ruby with

ldist 'foo','bar'

it gives me

can't convert Object into String (TypeError)

Why is it an Object and not a String?

I also tried to use RSTRING(s)->ptr insead of StringValuePtr, but that
gave me an invalid pointer.

Any suggestions on what to do here?

thanks in advance for any help.
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