Travis Watkins [2007-12-28 12:40]:
> On Dec 28, 2007 9:17 AM, Tilman Sauerbeck <[EMAIL PROTECTED]> wrote:
> > Hi,
> > I'm trying to write a client for XMMS2 in Vala.
> > XMMS2 doesn't use GObjects, but it uses callbacks in various places,
> > which makes it hard to use it in Vala.
> >
> > XMMS2 uses a struct called xmmsc_result_t, to which you can connect a
> > callback like this:
> >
> > static void handler(xmmsc_result_t *res, void *user_data) {...}
> >
> > xmmsc_result_t *res;
> > xmmsc_result_notifier_set (res, handler, NULL);
> >
> > So eventually "handler" will be called with res and NULL. The straight
> > forward Vala bindings make it impossible to connect an instance method
> > as a notifier for a Xmms.Result, since the callback is always passed a
> > xmmsc_result_t* as the first argument, but Vala needs the first argument
> > to be a Vala object resp gobject. Connecting to class methods/static
> > methods works just fine, but it's just not sufficient.
> >
>
> I think you're looking for the [InstanceLast] decorator. Then you just
> call xmmsc_result_notifier_set but only give it res and handler and
> your vala 'this' automatically gets put in for user_data.Thanks Travis, that's exactly what I need :) I saw InstanceLast being used before, but I never knew what it meant. I think I'll contribute to the tutorial soonish.. Regards, Tilman -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail?
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