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 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>.

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