使用AUTOLISP增加和删除扩展实体数据

XDSoft · 发表于 2021-1-8 13:21:01

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;; Adding and Removing Extended Entity Data
;;***cut here to end of file, and save in a ASCII text format to file **
;;************************** XM.lsp ************************************
;; Date: April 7, 1996
;; Written for R13
;; *** Example for adding and removing extended entity data. ***
;;
;; To see how this function works, place this code fragment
;; in a file named
;; XM.LSP and place the file in a directory that is in the
;; ACAD search path
;; or in the current AutoCAD directory.
;; Start a new drawing.
;; At the AutoCAD command line type: (load "XM") <return>
;; The function will then:
;; Register the applications name.
;; Create a circle with extended entity data associated with the
;; application name.
;; Print out the assoc code list for the circle entity.
;; Remove the extended entity data from the circle.
;; Then print out the assoc list again showing the extended data
;; removed.
;;
;; AutoLISP function used in this example:
;; regapp
;; entmake
;; setq
;; assoc
;; princ
;; subst
;; entmod
;; entget
;; entlast
;;
;; See the AutoCAD Customization Guide for information
;; on using these functions
;;
;; Date: 3/7/96
;;
;; AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
;; AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
;; MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
;; DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
;; UNINTERRUPTED OR ERROR FREE.
;;
(regapp "FREDS")
(entmake ; makes entity
'((0 . "CIRCLE") ; entity type
(8 . "0") ; layer name
(62 . 3) ; color
(39 . 2.75) ; thickness
(10 8.0 6.0 0.0) ; center point
(40 . 2.0) ; radius
; create and add xdata
(-3 ("FREDS" (1002 . "{")
(1000 . "This is my data")
(1000 . "More Data")
(1000 . "and some more data")
(1040 . 12.345)
(1010 8.97197 6.8436 0.0)
(1040 . 2.75013)
(1002 . "}")))
)
)
(Setq a (entget (entlast) '("FREDS")))
;; gets the assoc list with attached
;; extended entity data that belongs
;; to the regapp "FREDS"
(princ a) ;; prints assoc list to screen
(princ "\n\n") ;; two blank lines
(setq z (assoc -3 a)) ;; save xdata that belongs to the
;; regapp "FREDS" to z variable
(setq a (subst'(-3 ("FREDS")) (assoc -3 a) a)) ;; new assoc list without
;; xdata. The -3 assoc code has only
;; the regapp name without any data.
;; This gets substituted for the assoc
;; -3 list that has data.
(entmod a) ;; modifies entity removing the
;; xdata because feeding a entmod
;; an assoc list with only the regapp
;; name for the -3 assoc code removes
;; the extended entity data from the
;; entity.
(Setq a (entget (entlast) '("FREDS")))
;; gets the new assoc list to verify
;; the xdata has been removed
(princ a) ;; prints the new assoc list without
;; the xdata to screen.

-------------------------------------------------------------------------------- 
;; Adding and Removing Extended Entity Data 
;;***cut here to end of file, and save in a ASCII text format to file ** 
;;************************** XM.lsp ************************************ 
;; Date: April 7, 1996 
;; Written for R13 
;; *** Example for adding and removing extended entity data. *** 
;; 
;; To see how this function works, place this code fragment 
;; in a file named 
;; XM.LSP and place the file in a directory that is in the 
;; ACAD search path 
;; or in the current AutoCAD directory. 
;; Start a new drawing. 
;; At the AutoCAD command line type: (load "XM") <return> 
;; The function will then: 
;; Register the applications name. 
;; Create a circle with extended entity data associated with the 
;; application name. 
;; Print out the assoc code list for the circle entity. 
;; Remove the extended entity data from the circle. 
;; Then print out the assoc list again showing the extended data 
;; removed. 
;; 
;; AutoLISP function used in this example: 
;; regapp 
;; entmake 
;; setq 
;; assoc 
;; princ 
;; subst 
;; entmod 
;; entget 
;; entlast 
;; 
;; See the AutoCAD Customization Guide for information 
;; on using these functions 
;; 
;; Date: 3/7/96 
;; 
;; AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS. 
;; AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF 
;; MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC. 
;; DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE 
;; UNINTERRUPTED OR ERROR FREE. 
;; 
 
(regapp "FREDS") 
(entmake ; makes entity 
    '((0 . "CIRCLE") ; entity type 
    (8 . "0") ; layer name 
    (62 . 3) ; color 
    (39 . 2.75) ; thickness 
    (10 8.0 6.0 0.0) ; center point 
    (40 . 2.0) ; radius 
    ; create and add xdata 
    (-3 ("FREDS" (1002 . "{") 
                          (1000 . "This is my data") 
 
                          (1000 . "More Data") 
                          (1000 . "and some more data") 
                          (1040 . 12.345) 
                          (1010 8.97197 6.8436 0.0) 
                          (1040 . 2.75013) 
                          (1002 . "}"))) 
    ) 
) 
(Setq a (entget (entlast) '("FREDS"))) 
;; gets the assoc list with attached 
;; extended entity data that belongs 
;; to the regapp "FREDS" 
 
(princ a) ;; prints assoc list to screen 
(princ "\n\n") ;; two blank lines 
 
(setq z (assoc -3 a)) ;; save xdata that belongs to the 
;; regapp "FREDS" to z variable 
 
(setq a (subst'(-3 ("FREDS")) (assoc -3 a) a)) ;; new assoc list without 
;; xdata. The -3 assoc code has only 
;; the regapp name without any data. 
;; This gets substituted for the assoc 
;; -3 list that has data. 
 
(entmod a) ;; modifies entity removing the 
;; xdata because feeding a entmod 
;; an assoc list with only the regapp 
;; name for the -3 assoc code removes 
;; the extended entity data from the 
;; entity. 
 
(Setq a (entget (entlast) '("FREDS"))) 
;; gets the new assoc list to verify 
;; the xdata has been removed 
 
(princ a) ;; prints the new assoc list without 
;; the xdata to screen.

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