Re: AppleScript create command
Re: AppleScript create command
- Subject: Re: AppleScript create command
- From: "James J. Merkel" <email@hidden>
- Date: Tue, 13 Jul 2004 22:59:41 -0700
On Jul 13, 2004, at 11:16 AM, Dustin Voss wrote:
On 13 Jul, 2004, at 7:15 AM, James J. Merkel wrote:
Making a little more progress. I added the following to a delegate of
NSApplication:
- (BOOL)application:(NSApplication *)sender
delegateHandlesKey:(NSString *)key
{
NSLog(@"key = %@", key);
return [key isEqualToString:@"metadata"];
}
-(id)metadata{
NSLog(@"metadata method called");
return [ExifInfo self];
}
Is "metadata" a property or an element? If it is an element, you
should be returning an array of ExifInfo objects. If it is a property,
you should be returning one ExifInfo object.
"return [ExifInfo self]" is wrong. It will return nil because "self"
is not a selector. Return an NSArray or ExifInfo instance variable.
I'm not sure what the metadata method should really do. The above was
just a WAG.
Cocoa Scripting will handle the get command by converting the
AppleScript "metadata" element (I assume it's an element) into a
"metadata" to-many KVC key. The KVC system will call the -metadata
method, which should return an array, like any to-many key. The KVC
system will then pick out the indexed object and return that to Cocoa
Scripting. Cocoa Scripting will take that object and call
-objectSpecifier on it to convert it a specifier, which is a form the
rest of AppleScript can deal with. The specifier will be the return
value of the get command.
You need to re-read Apple's documentation. Try
<http://developer.apple.com/documentation/Cocoa/Conceptual/
AppArchitecture/Concepts/Scripting.html> and
<http://developer.apple.com/documentation/Cocoa/Conceptual/
Scriptability/Tasks/ScriptabilityGuidelines.html>.
Ok that worked -- I just created an array of ExifInfo objects and
returned that array from the metadata method.
Thanks for your help.
Jim merkel
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