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CAD tip CAD tip # 2063:

Question CAD 
 %  platform  category 
Q - question

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

A - answer 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")
or
(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
100% *  CAD 
26.3.2002    18826x   FAQ  
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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.


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