Returns the current value of an attribute of a QTMedia 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 QTMediaTimeScaleAttribute or QTMediaTypeAttribute. Possible attribute keys are listed in “Media Attributes.”

The value of the specified attribute.

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