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CAD tip CAD tip # 4170:

Question CAD 
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Q - question

What is the difference between the (command) and (vl-cmdf) LISP functions?

A - answer These AutoCAD-command-invoking functions are almost identical. The newer (vl-cmdf) VisualLISP function verifies the parameters passed to AutoCAD and invokes the command only if the arguments are valid.

Compare e.g.:

(setq p (getpoint))
(vl-cmdf "_ID" p)
(vl-cmdf "_ID" "dummy")
(command "_ID" "dummy")
(vl-cmdf) returns T if the command was invoked successfully (nil otherwise).
ACAD
100% *  CAD 
17.12.2004    6678x  
Comments   Tell a friend
applies to: AutoCAD ·

See also:
Tip 9212:Export coordinates of intersection points.
Tip 9185:Fix problem of Areas on self-intersecting curves in AutoCAD 2013.
Tip 9149:Total area of selected regions (by layer)
Tip 9063:Flip 3D faces (front/back) in AutoCAD.
Tip 9042:Random scatter of AutoCAD drawing objects.


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