CAD tip # 4170:

Question

CAD

% platform category

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

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

*CAD

17.12.2004 14264×

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this tip shared by ARKANCE experts applies to: AutoCAD ·

See also:
Tip 14991:	Changing the order of rows in a table - sorting tables in AutoCAD.
Tip 14989:	How to draw a line from its midpoint in AutoCAD?
Tip 14962:	How do you connect two offset lines with an ogee curve, double-arc wave?
Tip 14946:	Dimensioning the arc length and radius at the same time.
Tip 14944:	How to import or export an SVG file in AutoCAD? (SVGimport/SVGexport)

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