Working with Collection Objects

Working with Collection Objects

Releasing Objects and Freeing Memory

 

AutoLISP Developer's Guide > Using the Visual LISP Environment > Working with ActiveX > Using Visual LISP Functions with ActiveX Methods > Working with Collection Objects > 

Retrieving Member Objects in a Collection

The Item method retrieves a member object from a collection. The Count property shows the number of items in a collection. Using the Item method and Count property, you can individually process each object in a collection. For example, you can look at each object in a model space, determine the type of object, and process only the types of objects you are interested in. The following code prints the start angle for each arc object in a model space:

(setq index 0)

(repeat   (vla-get-count mspace)

  (if (= "AcDbArc" (vla-get-objectname (vla-item mspace index)))

	(progn

	(princ "\nThe start angle of the arc is ")

	(princ (vla-get-startangle (vla-item mspace index)))

	)

  )

  (setq index (+ index 1))

)

Note that Item and Count also apply to groups and selection sets.