From: "Nicolas Cannasse" <warplayer@free.fr>
To: "Xavier Leroy" <xavier.leroy@inria.fr>
Cc: "kyra" <kyrab@mail.ru>, "OCaml" <caml-list@inria.fr>
Subject: Re: [Caml-list] OCam'OLE pre-release
Date: Mon, 5 Aug 2002 11:51:08 +0200 [thread overview]
Message-ID: <003901c23c65$9fe95e30$0700a8c0@warp> (raw)
In-Reply-To: <20020805113255.C7554@pauillac.inria.fr>
> > The job of the GC is to release unreferenced objects.
> > But I don't see how this can cause a bug : it seems that your crash is
due
> > to a call of a COM method on a object AFTER it has been released... if
it
> > has been Release, then it is no longer referenced by Ocaml... so , how
can u
> > ever call a method on it ???
>
> Because the COM object can still be referenced from C. You probably
> forgot to do an AddRef somewhere, e.g. when extracting a COM object
> reference from its Caml wrapper.
>
> Reference count management sure is tricky...
True.
If you're using OCamole to manipulate COM objects and then passing them back
to C, your C code need to call AddRef on the retreived COM object since
OCamole GC'ed process does not respect the COM spec (caller is responsible
from Release, callee call AddRef )
Simply use the following function :
IUnknown *get_com_object( value v ) {
IUnknown *o = IUnknown_val(v);
o->AddRef();
return o;
}
Nicolas Cannasse
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next prev parent reply other threads:[~2002-08-05 9:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-30 19:19 Nicolas Cannasse
2002-07-31 12:06 ` [Caml-list] OCam'OLE pre-release (mirror) Nicolas Cannasse
2002-07-31 12:48 ` Samuel Lacas
2002-07-31 13:13 ` Nicolas Cannasse
2002-07-31 13:30 ` Samuel Lacas
2002-08-01 23:39 ` [Caml-list] OCam'OLE pre-release kyra
2002-08-02 10:13 ` Nicolas Cannasse
2002-08-02 23:26 ` kyra
2002-08-02 23:23 ` Quetzalcoatl Bradley
2002-08-04 12:00 ` kyra
2002-08-03 11:47 ` kyra
2002-08-05 7:46 ` Nicolas Cannasse
2002-08-05 9:32 ` Xavier Leroy
2002-08-05 9:51 ` Nicolas Cannasse [this message]
2002-08-06 12:15 ` kyra
2002-08-07 8:55 ` Nicolas Cannasse
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