From: Eric Hodel <drbrain@...7.net>
Date: 2004-06-03T10:55:04-07:00
Subject: Re: A question about GC

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Sam Sungshik Kong (ssk@chol.nospam.net) wrote:

> Hello!
>=20
> While I was making my own utility functions, I met an interesting situati=
on.
> I want to know how to solve this kind of problem.
>=20
> I want to use Excel from ruby using OLE.
> To make steps simple, I created functions to open excel and close it.
>=20
> get_excel function has no problem.
> I call it like
> xl =3D get_excel
>=20
> When I'm done with it, I want to close it and unload it from memory.
> The right procedure is
>=20
> xl.quit
> xl =3D nil
> GC.start
>=20
> I want to make a function for the 3 steps.
>=20
> def quit_excel(xl)
>   xl.quit
>   xl =3D nil
>   GC.start
> end
>=20
> When I call it, I do
>=20
> quit_excel(xl) #don't work as expected
>=20
> As you know, the argument is call-by-value and even if I set nil to xl, t=
he
> outer reference is still referencing Excel.
> So GC won't collect it.
>=20
> How can I solve this problem?

def with_excel
  xl =3D get_excel
  yield xl
ensure
  xl.quit
  xl =3D nil
  GC.start
end

=2E..

with_excel do |xl|
  ... # your code
end

--=20
Eric Hodel - drbrain@segment7.net - http://segment7.net
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