From: Quintus <quintus@...>
Date: 2013-03-03T20:07:34+09:00
Subject: Re: Extending Ruby. Little help or guidance if you are willing!

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Am Sun, 3 Mar 2013 10:31:25 +0900
schrieb Cliff Rosson <cliff.rosson@gmail.com>:

> Hi Folk,

Hi Cliff,

> def display_segments(num, display, io, delay =3D 0.005)
>   # ...
>   sleep delay
>   # ...
> end

I doubt Ruby=E2=80=99s sleep is exact enough to sleep such a small delay of
time, especially given the general Floating-Point precision problems.
I=E2=80=99d suspect that your #sleep call is actually taking longer than you
expect.

> I think the logic in my C method would be the same as my ruby one.
> The part where I run into trouble is converting values. For example I
> can't figure out how to decide which pins to light by hash key. In
> fact I can't even figure out how to get the hash keys...

There are two great sources I use when writing C extensions for Ruby:

* The official README.EXT by Matz:
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/tags/v2_0_0_0/README.EXT?view=
=3Dmarkup

* Rubinius=E2=80=99 ruby.h header file, because it=E2=80=99s way better doc=
umented than
  Ruby=E2=80=99s:
  https://github.com/rubinius/rubinius/blob/master/vm/capi/19/include/ruby/=
ruby.h

For getting values out of hashes, you want rb_hash_aref().

Vale,
Marvin

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