gobject:object-interface-find-property (gtype name)

gtype -- a g:type-t type ID for an interface type
name -- a string with the name of a property to lookup

The g:param-spec instance for the property of the interface type with, or nil if no such property exists.

Find the g:param-spec instance with the given property name for an interface type. Signals an error if the gtype type ID is not an "GInterface" type.

(g:object-interface-find-property "GAction" "name")
=> #.(SB-SYS:INT-SAP #X55A6D24988C0)
(g:param-spec-name *)
=> "name"
(g:object-interface-find-property "GAction" "unknown")
=> NIL