Function Entry: VL-FILENAME-MKTEMP

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Function Entry: VL-FILENAME-MKTEMP

Name

vl-filename-mktemp

Class

Visual LISP Pathname Function

Syntax

(vl-filename-mktemp [pattern [directory [extension]]])

Arguments and Values

pattern — optional base pattern string.
directory — optional directory string.
extension — optional extension string.

Description

Calculates a unique file name to be used for a temporary file.

Return Values

String.

Side Effects

Allocates or reserves a temporary file name under host semantics; whether a file is also created should be treated as implementation-sensitive until confirmed.

Availability

AutoCAD 2026: documented (per Autodesk reference page).
BricsCAD V26: presumed compatible (no contradicting page found).
Status: AutoCAD documented; BricsCAD presumed-both pending Phase 4 verification.

Source Notes

[vl-filename-mktemp (AutoLISP)](https://help.autodesk.com/cloudhelp/2026/ESP/AutoCAD-MAC-AutoLISP-Reference/files/GUID-F417A5EF-95BB-47EE-B60E-7C017635580D.htm)

Notes

Autodesk documents that the returned file name is unique and that no file is created by the function itself.
Autodesk documents that the extension argument should not include the leading period.
Autodesk documents a Unicode/LISPSYS behavior change in AutoCAD 2021.