vl-file-directory-p (AutoLISP)

Determines if a file name refers to a directory

Supported Platforms: Windows and Mac OS

Signature

(vl-file-directory-p filename)

filename

Type: String

File name. If you do not specify a full path name, vl-file-directory-p searches only the AutoCAD default drawing directory.

Return Values

Type: T or nil

T, if filename is the name of a directory; nil if it is not.

Release Information

Releases:

• AutoCAD R14 and later on Windows
• AutoCAD 2011 and later on Mac OS

History

AutoCAD 2021

• filename argument previously accepted an ASCII text string, but now accepts a Unicode text string.
• LISPSYS system variable controls which AutoLISP engine is used and the behavior of the function.
  • 0 - ASCII character support (legacy behavior)
  • 1 or 2 - Unicode character support
  Note: After the value of the LISPSYS system variable has been changed, AutoCAD must be restarted for the change to take affect.

Examples

Windows

(vl-file-directory-p "sample")
T

(vl-file-directory-p "yinyang")
nil

(vl-file-directory-p "c:/My Documents")
T

(vl-file-directory-p "c:/My Documents/lisp/yinyang.lsp")
nil

Mac OS

(vl-file-directory-p "support")
T

(vl-file-directory-p "xyz")
nil

(vl-file-directory-p "/documents")
T

(vl-file-directory-p "/documents/output.txt")
nil