Re: Problems with ScriptingBridge and iTunes

FROM : Steven Degutis
DATE : Mon Mar 03 16:27:43 2008

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_removed>> 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