(vl-load-com)
(defun c:Example_MaxAutoCADWindow()
;; This example returns the current setting of
;; MaxAutoCADWindow. It then changes the value, and finally
;; it resets the value back to the original setting.
(setq acadObj (vlax-get-acad-object))
(setq preferences (vla-get-Preferences acadObj))
;; Retrieve the current MaxAutoCADWindow value
(setq currMaxAutoCADWindow (vla-get-MaxAutoCADWindow (vla-get-Display preferences)))
(alert (strcat "The current value for MaxAutoCADWindow is " (if (= currMaxAutoCADWindow :vlax-true) "True" "False")))
;; Change the value for MaxAutoCADWindow
(vla-put-MaxAutoCADWindow (vla-get-Display preferences) (if (= currMaxAutoCADWindow :vlax-true) :vlax-false :vlax-true))
(alert (strcat "The new value for MaxAutoCADWindow is " (if (= (vla-get-MaxAutoCADWindow (vla-get-Display preferences)) :vlax-true) "True" "False")))
;; Reset MaxAutoCADWindow to its original value
(vla-put-MaxAutoCADWindow (vla-get-Display preferences) currMaxAutoCADWindow)
(alert (strcat "The MaxAutoCADWindow value is reset to " (if (= (vla-get-MaxAutoCADWindow (vla-get-Display preferences)) :vlax-true) "True" "False")))
)