Returns the current value of an attribute of a QTTrack object.
Original signature is '- (id)attributeForKey:(NSString *)attributeKey'
Available in Mac OS X v10.3 and later.


- attributeKey (NSString)
- An NSString object that specifies the attribute to be read; pass strings like QTTrackTimeScaleAttribute or QTTrackVolumeAttribute.

An NSObject that is the value of the specified attribute key.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)