(directory-exists? "C:\\Windows\\System32") -> #t (file-exists? "C:\\Windows\\System32") -> #f You wrote: "(Yes, Windows 8, please don't laugh at me. :-) )" I am laughing to myself, for I use windows 7 and windows XP :) Jos
_____ From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org] On Behalf Of Tim Nelson Sent: jueves, 06 de diciembre de 2012 23:13 To: users@racket-lang.org Subject: [racket] Behavior of file-exists? and directory-list Dear Benevolent Racketeers, I just installed DrRacket 5.3.1 on my Windows 8 Laptop. (Yes, Windows 8, please don't laugh at me. :-) ) I have not checked this on other operating systems or other versions of Racket. One of my Racket projects scans the PATH directories to locate the Java executable, if one is installed. I have the executable "java.exe" present in the C:\Windows\System32 folder, yet: > (file-exists? "C:\\Windows\\System32") #f To check myself, I invoked and manually scanned down (directory-list "C:\\Windows\\System32"), expecting to see #<path:java.exe> but did not. Moreover, counting hidden files and subfolders, I had 3576 files in that folder (confirmed via command prompt, not recursive). If I don't include hidden files, I have 3238. But: > (length (directory-list "C:\\Windows\\System32")) 2739 So it appears that (directory-list) is missing several hundred files that actually exist, including java.exe. java.exe is not hidden, not read-only, and it's not obviously a link. (And even if it was, shouldn't file-exists? and directory-list include it?) On my Windows 7 PC at home, directory-list finds java.exe, but still lists a hundred plus fewer files than appear via DIR: > (length (directory-list "C:\\Windows\\System32")) 2389 C:\Windows\System32>DIR 2720 File(s) ... 91 Dir(s) ... I'm stumped. I even tried to track directory-list to its source, but lost the scent in pre-base.rkt. What am I missing here? Is this a potential problem with these functions in Windows 7 and 8, or am I perhaps using them incorrectly? Thanks, - Tim
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