NSAppleEventDescriptor - getting a double (and other animals)
NSAppleEventDescriptor - getting a double (and other animals)
- Subject: NSAppleEventDescriptor - getting a double (and other animals)
- From: Luke Evans <email@hidden>
- Date: Mon, 21 Jan 2008 20:46:48 -0800
I wish to allow my scripting interface to accept 'any' for a
property. I see that this is handled in Cocoa by the relevant method
being sent an object of type NSAppleEventDescriptor, and I have
implemented the fairly straightforward and obvious code to handle the
types string, int32 and boolean (these all being available on
NSAppleEventDescriptor itself). Now, I need to implement handlers for
some other types (doubles, dates). This is clearly where things kick
up a gear in terms of what is required to handle them properly, and my
browsing of docs so far (particularly the Cocoa Scripting Guide) has
not turned up the recommended way of coercing these
NSAppleEventDescriptors to appropriate objects (NSNumber, NSDate...).
I could coerce everything through a string with what I have now, but I
think that would be a tad naughty.
I see there's an NSScriptCoercionHandler, and I've tried messing with
it (i.e. convert a numeric NSAppleEventDescriptor to an NSNumber), but
given the fact it seems to hand the original object right back, I
imagine that I'm misunderstanding its use (...there's not a great deal
of documentation on this class).
What is the proper way to unpack NSAppleEventDescriptors when I'm
after simple values like doubles and dates? (Maybe I'll deal with
lists later, but I think I can already see how lists work).
-- Lwe
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