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Re: windows and file names > 256 bytes

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Date Thu, 25 Jun 2015 20:23:16 +1000
Subject Re: windows and file names > 256 bytes
From Chris Angelico <rosuav@gmail.com>
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On Thu, Jun 25, 2015 at 8:10 PM, Tim Golden <mail@timgolden.me.uk> wrote:
>> Are there any times when you *don't* want Windows to use the
>> extended-length path?
>
> Yes: when you're passing a relative filepath. Which could pretty much be
> any time. As you might imagine, this has come up before -- there's an
> issue on the tracker for it somewhere. I just don't think it's simple
> enough for Python to know when and when not to use the extended path
> syntax without danger of breaking something.

Oh blah. So I suppose that means there's fundamentally no way to use a
long (>256 byte) relative path on Windows?

> Bear in mind that the \\?\ prefix doesn't just extend the length: it
> also allows otherwise special-cased characters such as "." or "..". It's
> a general-purpose mechanism for handing something straight to the file
> system without parsing it first.

Ohh. So... hmm. So what this really means is that a path could get
\\?\ prepended when, and ONLY when, it becomes absolute. Windows can
be a real pest...

ChrisA

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Thread

windows and file names > 256 bytes Albert-Jan Roskam <sjeik_appie@hotmail.com> - 2015-06-25 08:00 +0000
  Re: windows and file names > 256 bytes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-25 19:16 +1000
    Re: windows and file names > 256 bytes Chris Angelico <rosuav@gmail.com> - 2015-06-25 19:23 +1000
    Re: windows and file names > 256 bytes Tim Golden <mail@timgolden.me.uk> - 2015-06-25 11:10 +0100
    Re: windows and file names > 256 bytes Chris Angelico <rosuav@gmail.com> - 2015-06-25 20:23 +1000
    Re: windows and file names > 256 bytes Terry Reedy <tjreedy@udel.edu> - 2015-06-25 13:03 -0400

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