Returns the value associated with a given key.
Original signature is '- (id)objectForKey:(id)key'
Available in Mac OS X v10.6 and later.


- key (Id)
- An object identifying the value.

The value associated with key, or NULL if no value is associated with key. The caller does not have to release the value returned to it.

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