lisp如何判断文件/文件夹是否存在？？？
如题 lisp如何判断文件/文件夹是否存在？？？vl-directory-files
Lists all files in a given directory
(vl-directory-files)
Arguments
directory
A string naming the directory to collect files for; if nil or absent, vl-directory-files uses the current directory.
pattern
A string containing a DOS pattern for the file name; if nil or absent, vl-directory-files assumes “*.*”
directories
An integer that indicates whether the returned list should include directory names. Specify one of the following:
-1 List directories only.
0 List files and directories (the default).
1 List files only.
Return Values
A list of file and path names; otherwise nil if no files match the specified pattern.
Examples
_$ (vl-directory-files "c:/acadwin"
"acad*.exe")
("ACAD.EXE" "ACADAPP.EXE" "ACADL.EXE" "ACADPS.EXE")
_$ (vl-directory-files "e:/acadwin"
nil -1)
("." ".." "SUPPORT" "SAMPLE" "ADS" "FONTS" "IGESFONT" "SOURCE" "ASE")
_$ (vl-directory-files "E:/acad13c4"
nil -1)
("." ".." "WIN" "COM" "DOS")
vectra 发表于 2022-5-10 09:52
vl-directory-files
感谢大哥，学习了
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