Bug in DIR command?

Posted By: mawcc | Jul 1st @ 2:31 AM
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Comments: 8 | Views: 894
#Jul 1st @ 2:31 AM
mawcc
mawcc
Today I've been researching an error where an ASP.NET image handler would display a wrong screenshot. Interestingly it turned out that the Directory.GetFiles method as well as the DIR command list a wrong file in wildcard mode:



As can be seen, the first file shouldn't belong in this list. The directory contains close to 5000 files, and when I copy the 4 files from above into an emtpy directory the error doesn't appear.
#Jul 1st @ 3:04 AM
blowdart
blowdart
Big Smile

It's the 8.3 file name; try dir /X then compare the results with your wildcard
#Jul 1st @ 3:43 AM
mawcc
mawcc
Your're right, thanks. Is there a way to force Directory.GetFiles to consider only long file names? I couldn't find anything in the docs.

Btw, a "gci 13440*" in Powershell does the correct thing.
#Jul 1st @ 4:18 AM
Dexter
Dexter
No, you cannot make GetFiles return only long filenames but you can post filter them yourself. An

if (fileName.StartsWith("13440", StringComparison.OrdinalIgnoreCase))
{
...
}

will do the right thing. I wouldn't be too surprised if PowerShell does exactly the same thing.
#Jul 1st @ 2:24 PM
littleguru
littleguru
We still need to deal with this kind of things... wow this is crazy.
#Jul 1st @ 11:52 PM
jh71283
jh71283
I might be daft, but I don't see why this should be a problem for 8.3.

13434_13434 should surely be abbreviated to 13434_~1.xxx in 8.3?

Then it would not match the wildcard that mawcc has pointed out.

#Jul 2nd @ 12:13 AM
Dexter
Dexter
Not always. It really depends on how many files you have in that directory and how "similar" they are. Here's an example:

00CD04~7.TXT 00000000-10002787.txt
00C114~5.TXT 00000000-10002788.txt
00C514~3.TXT 00000000-10002789.txt
00C1F5~4.TXT 00000000-10002790.txt
00C5F5~4.TXT 00000000-10002791.txt

As you can see the short names are quite different and they'll match a dir wildcard like 00C*
#Jul 2nd @ 12:16 PM
jh71283
jh71283
Ah I see.

I was under the impression they abbreviated in a more predictable manner, but I can see why this is sometimes not the case.
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