Re: Problems with ScriptingBridge and iTunes
Re: Problems with ScriptingBridge and iTunes
- Subject: Re: Problems with ScriptingBridge and iTunes
- From: "Steven Degutis" <email@hidden>
- Date: Mon, 3 Mar 2008 09:27:43 -0600
Thank you for the update on that sample code. I was hoping it would
continue to be ignored because I was publicly berated in the #macdev
channel for posting it, but oh well. Thanks to Wolf's post up there,
I'm not going to continue to learn SB any longer, and I just hope
Apple fixes it up.
On Mon, Mar 3, 2008 at 12:32 AM, Jens Alfke <email@hidden> wrote:
>
> On 2 Mar '08, at 4:54 AM, Steven Degutis wrote:
>
> > I think it's clear why [currentTrack
> > isKindOfClass:[iTunesFileTrack class]] evaluates to true: in the
> > previous line, you defined it as such, like this:
> > iTunesTrack *currentTrack = [iTunes currentTrack];
> > So obviously it is an iTunesTrack!
>
> No. It could be an instance of a subclass of iTunesTrack, such as (in
> this case) iTunesFileTrack. (That's true of any object-oriented
> language.)
>
>
> > Try this:
> > iTunesFileTrack *currentTrack = [iTunesFileTrack currentTrack];
>
> That won't even compile. You can't assign an iTunesTrack* to an
> iTunesFileTrack*.
>
> Moreover, since Obj-C is a dynamic language, it's more important what
> the class of the object is at runtime, than what type the pointers are
> defined as at compile time. You can change the type declarations, but
> it won't affect what actual objects you get back at runtime.
>
> —Jens
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