2.7 The final details.

Methods and signals have arguments. They are described in the arg XML elements.

Function: dbus-introspect-get-argument-names bus service path interface name

Return a list of all argument names as list of strings. name must be a method or signal XML element. Example:

(dbus-introspect-get-argument-names
  :session "org.freedesktop.xesam.searcher"
  "/org/freedesktop/xesam/searcher/main"
  "org.freedesktop.xesam.Search" "GetHitData")

⇒ ("search" "hit_ids" "fields" "hit_data")

Argument names are optional; the function can return nil therefore, even if the method or signal has arguments.

Function: dbus-introspect-get-argument bus service path interface name arg

Return argument ARG as XML object. name must be a method or signal XML element. Example:

(dbus-introspect-get-argument
  :session "org.freedesktop.xesam.searcher"
  "/org/freedesktop/xesam/searcher/main"
  "org.freedesktop.xesam.Search" "GetHitData" "search")

⇒ (arg ((name . "search") (type . "s") (direction . "in")))

Function: dbus-introspect-get-signature bus service path interface name &optional direction

Return signature of a method or signal, represented by name, as string.

If name is a method, direction can be either ‘in’ or ‘out’. If direction is nil, ‘in’ is assumed.

If name is a signal, and direction is non-nil, direction must be ‘out’. Example:

(dbus-introspect-get-signature
  :session "org.freedesktop.xesam.searcher"
  "/org/freedesktop/xesam/searcher/main"
  "org.freedesktop.xesam.Search" "GetHitData" "in")

⇒ "sauas"

(dbus-introspect-get-signature
  :session "org.freedesktop.xesam.searcher"
  "/org/freedesktop/xesam/searcher/main"
  "org.freedesktop.xesam.Search" "HitsAdded")

⇒ "su"