Re: windows and file names > 256 bytes

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From	Terry Reedy <tjreedy@udel.edu>
Subject	Re: windows and file names > 256 bytes
Date	Thu, 25 Jun 2015 13:03:53 -0400
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On 6/25/2015 5:16 AM, Steven D'Aprano wrote:
> On Thursday 25 June 2015 18:00, Albert-Jan Roskam wrote:
>
>> Hi,
>>
>> Consider the following calls, where very_long_path is more than 256 bytes:
>> [1] os.mkdir(very_long_path)
>> [2] os.getsize(very_long_path)
>> [3] shutil.rmtree(very_long_path)
>>
>> I am using Python 2.7 and [1] and [2] fail under Windows XP [3] fails
>> under Win7 (not sure about XP). It throws: “WindowsError: [Error 206] The
>> filename or extension is too long”
>
> I don't think this is a bug. It seems to be a limitation of Windows.
>
> https://msdn.microsoft.com/en-
> us/library/windows/desktop/aa365247%28v=vs.85%29.aspx#maxpath
>
>> This is even when I use the "special"
>> notations \\?\c:\dir\file or \\?\UNC\server\share\file, e.g.
>> os.path.getsize("\\\\?\\" + "c:\\dir\\file")
>
> However, that may be a bug.
>
> What happens if you use a Unicode string?
>
> path = u"\\\\?\\c:a\\very\\long\\path"
> os.mkdir(path)
>
>
> Can you open an existing file?
>
> open(u"\\\\?\\c:a\\very\\long\\path\\file.txt")
>
>
>
>> (Oddly, os.path.getsize(os.path.join("\\\\?", "c:\\dir\\file")) will
>> truncate the prefix)
>
> That's worth reporting as a bug.

If possible, please try the same operations with Python 3.4 or .5 before 
making a report


-- 
Terry Jan Reedy

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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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