LISP to Remove Unreferenced PDFUNDERLAYs

2025-07-14T13:28:33Z

Hi

I found the lisp below, it looks like it could do what I want but I can't see how to change it to remove unreferenced PDF underlays, any advice please?

https://www.cadtutor.net/forum/topic/96952-lisp-to-remove-unreferenced-xref/#comment-664904

;;  PurgeImages.lsp by Trevor Bird
;; Removes Unreferenced Images
;;  2021-02-20

;;------------------------------------------------------------------------------
(defun purgeimages
  (
    /

    ACAD_IMAGE_DICT__dxf
    ACAD_IMAGE_DICT__ename
    ACAD_REACTORS__dxf
    assoc_330

    count_imagedef
    count_imageref
    count_purged

    dps_3
    dps_330

    entity_dxf
    entity_ename
    entity_type

    imagedef_dxf
    imagedef_ename
    ImageFile
    imageref_dxf
    imageref_ename

    list_ImageNames
  )
  (setq count_purged  0)

  (cond
    (  (not (setq ACAD_IMAGE_DICT__dxf    (dictsearch (namedobjdict) "ACAD_IMAGE_DICT"))))
    (  (not (setq ACAD_IMAGE_DICT__ename  (cdr (assoc -1 ACAD_IMAGE_DICT__dxf)))))

      ;;  dps_3 = xrecord names = image names
    (  (not (setq dps_3  (vl-remove-if-not '(lambda ( _dp ) (= (car _dp) 3)) ACAD_IMAGE_DICT__dxf))))

      ;;  List of xrecord names = list of image Names
    (  (not (setq list_ImageNames  (mapcar 'cdr dps_3))))

    (list_ImageNames
      (foreach fe__ImageName list_ImageNames
        (setq imagedef_dxf    (dictsearch ACAD_IMAGE_DICT__ename fe__ImageName)
              imagedef_ename  (cdr (assoc -1 imagedef_dxf))
              ImageFile       (cdr (assoc 1 imagedef_dxf))
        );setq

        (cond
          (  (not (setq ACAD_REACTORS__dxf  (member  '(102 . "{ACAD_REACTORS") imagedef_dxf))))
          (  (not
                (setq ACAD_REACTORS__dxf  (reverse (member '(102 . "}") (reverse ACAD_REACTORS__dxf)))
                      dps_330             (vl-remove-if-not '(lambda ( _dp ) (= (car _dp) 330)) ACAD_REACTORS__dxf)
                );setq
            );not
          );

          (dps_330
            (setq count_imagedef  0
                  count_imageref  0
            );setq

            (foreach fe__dp dps_330
              (setq entity_ename  (cdr fe__dp)
                    entity_dxf    (entget entity_ename)
                    entity_type   (cdr (assoc 0 entity_dxf))
              );setq

              (cond
                (  (not (= entity_type "IMAGEDEF_REACTOR")))

                (  (not (setq count_imagedef  (1+ count_imagedef))))

                  ;;  330 - Object ID for associated image object (image reference)
                (  (not (setq assoc_330  (assoc 330 entity_dxf))))

                (assoc_330
                  (setq imageref_ename  (cdr assoc_330)
                        imageref_dxf    (entget imageref_ename)
                  );setq

                  (cond
                    (  (not imageref_dxf)
                      ;;  Image reference was deleted.
                    );(not imageref_dxf)

                    (imageref_dxf
                      (setq count_imageref  (1+ count_imageref))
                    );imageref_dxf
                  );cond
                );assoc_330
              );cond
            );fe__dp


            (if (zerop count_imageref)
              (progn
                ;;  Delete image definition xrecord.
                (setq count_purged  (1+ count_purged))
                (entdel imagedef_ename)
                (dictremove ACAD_IMAGE_DICT__ename fe__ImageName)

                (princ "\nDeleting image ")
                (prin1 fe__ImageName)
                (princ ".")
              );progn
            );if
          );dps_330
        );cond`
      );fe__ImageName
    );list_ImageNames
  );cond


  (cond
    (  (not (zerop count_purged))
      (princ "\n")
      (prin1 count_purged)

      (if (> count_purged 1)
        (princ " images ")
        (princ " image ")
      );if

      (princ "deleted.")
    );(not (zerop count_purged))

    (  (zerop count_purged)
      (princ "\nNo unreferenced images found.")
    );(zerop count_purged)
  );cond


  (princ)
)    ;c:purgeimages