关于 Xrecord 对象（AutoLISP）

Xrecord 对象用于存储和管理任意数据。

它们由 DXF 组代码和普通对象组代码（即非 xdata 组代码）组成，对于支持的范围，范围从 1 到 369。这些对象在概念上类似于 xdata，但不受大小或顺序的限制。

下面的代码示例在名为 XRECLIST 的自定义字典中创建并列出 xrecord 数据。

(defun C:MAKEXRECORD( / xrec xname )
  ; create the xrecord's data list.
  (setq xrec '((0 . "XRECORD")(100 . "AcDbXrecord")
    (1 . "This is a test xrecord list")
    (10 1.0 2.0 0.0) (40 . 3.14159) (50 . 3.14159)
    (62 . 1) (70 . 180))
  )

  ; use entmakex to create the xrecord with no owner.
  (setq xname (entmakex xrec))

  ; add the new xrecord to the named object dictionary.
  (dictadd (namedobjdict) "XRECLIST" xname)
 (princ)
)

(defun C:LISTXRECORD ( / xlist )
  ; find the xrecord in the named object dictionary.
  (setq xlist (dictsearch (namedobjdict) "XRECLIST"))

  ; print out the xrecord's data list.
  (princ xlist)
 (princ)
)

LISTXRECORD 命令的结果将类似于以下内容：

((-1 . <Entity name: 7ffffb05ee0>) (0 . XRECORD) (5 . 1E6) (102 . {ACAD_REACTORS) (330 . <Entity name: 7ffffb038c0>) (102 . }) (330 . <Entity name: 7ffffb038c0>) (100 . AcDbXrecord) (280 . 1) (1 . This is a test xrecord list) (10 1.0 2.0 0.0) (40 . 3.14159) (50 . 3.14159) (62 . 1) (70 . 180))