




 
The generic function com-object-query-interface is called by the built-in implementation of query-interface for the class standard-i-unknown. The built-in primary method specializing on standard-i-unknown handles the i-unknown interface and all the interfaces specified by the define-com-implementation form for the class of object.
In most cases, there is no need to specialize this generic function for user-defined classes.
LispWorks COM/Automation User Guide and Reference Manual - 23 Mar 2017