Returns the value for an input port of a composition. (required)
Original signature is '- (id)valueForInputKey:(NSString *)key'
Available in Mac OS X v10.4 and later.


- key (NSString)
- The key associated with an input port for the root patch of a composition. This method throws an exception if key is invalid.

The value. The data type of returned value depends on the type of the input port. See QCPortAttributeTypeKey for more information.

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