file-exists? checks if it a FILE, it returns false on directories, links (shortcuts), special files, etc.
Could that be it? Jay On Thu, Dec 6, 2012 at 3:13 PM, Tim Nelson <tbnel...@gmail.com> wrote: > 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 > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users > > -- Jay McCarthy <j...@cs.byu.edu> Assistant Professor / Brigham Young University http://faculty.cs.byu.edu/~jay "The glory of God is Intelligence" - D&C 93
____________________ Racket Users list: http://lists.racket-lang.org/users
