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CAD tip # 2063:

Question CAD
% platform category

How to open a drawing with write-protection (R/O)?

If you want to open a drawing (e.g. in LISP or in script) in a forced read-only (R/O) mode, you can use the following VLISP code:

(vl-load-com)
(defun openRO (fn)
 (vla-activate (vla-open (vla-get-documents (vlax-get-acad-object)) fn :VLAX-TRUE))
)

Then you can use e.g.:

(openRO "C:\documents\mydrawing.dwg")

(openRO (getfiled "Open R/O" "" "DWG" 0))

to open the drawing in ReadOnly mode (write-protected).

You can then also redefine the OPEN command to open all DWG files as read-only:

_UNDEFINE _OPEN
(defun C:OPEN()(openRO (getfiled "Open R/O" "" "DWG" 0))(princ))

and define a new command - "OPENEDIT" - to perform a "real" open:

(defun C:OPENEDIT()(command "._OPEN)(princ))

ACAD2010ACAD2008ACAD2004ACAD2000

* CAD

26.3.2002 19674× FAQ

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applies to: AutoCAD 2010 · AutoCAD 2008 · AutoCAD 2004 · AutoCAD 2000 ·

See also:
Tip 10926:	Self-intersecting polylines and polylines with duplicate vertices.
Tip 10663:	Automatic warning on DWG open.
Tip 10647:	How to store macros inside DWG drawings?
Tip 9913:	How to detect DWG files created in the drawing module in Autodesk Fusion 360?
Tip 9665:	Automatic update of tables linked with datalinks.

Selected tip: Can I use HP DesignJet 500 under Solaris?

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