[racket] Behavior of file-exists? and directory-list

I don't think that the file (in this case, java.exe) is a symlink, and it's
definitely not a shortcut. What really worries me is that it doesn't come
up when calling (directory-list), which doesn't have as strong a filter as
file-exists?. Is directory-list supposed to ignore anything?

I could pipe the DIR output to a file and compare to find what
files/folders are missing in the list...

On Thu, Dec 6, 2012 at 5:17 PM, Jay McCarthy <jay.mccarthy at gmail.com> wrote:

> 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 <tbnelson at 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 <jay at cs.byu.edu>
> Assistant Professor / Brigham Young University
> http://faculty.cs.byu.edu/~jay
>
> "The glory of God is Intelligence" - D&C 93
>
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