Jwno Documentation

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A custom UIAutomation event handler can be used for this:

(import jwno/util)
(import jwno/log)
(use jw32/_uiautomation)

# The window object we are interested in.
(def win ...)

# The handler function. We just print some simple log here.
(defn handler-fn [sender prop-id new-value]
  (when (= prop-id UIA_NamePropertyId)
    (log/info "++++ Window title changed to: %n ++++" new-value)))

# To register the handler:
(def handler
  (util/with-uia [elem (:get-uia-element win)]
    (:AddPropertyChangedEventHandler
       (get-in jwno/context [:uia-manager :com])
       elem
       TreeScope_Element
       nil
       handler-fn
       [UIA_NamePropertyId])))

# To remove the handler later:
(util/with-uia [elem (:get-uia-element win)]
  (:RemovePropertyChangedEventHandler
     (get-in jwno/context [:uia-manager :com])
     elem
     handler)
  (:Release handler))

Most of UIAutomation elements' properties can be "watched" in this way.

But note that the UIAutomation interface is quite low-level, and subject to change. Improper use will result in memory leaks or crashes.