Error folder 256 lenght


I have this script for check the last date of modify in my shared folders, but he gives me a error when the directory is more large that 256 characters.

What  i need to do for  fix it?
IT AdminAsked:
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Chris DentPowerShell DeveloperCommented:
It's a limitation of .NET itself which makes it very hard to fix. I can supply documentation to support this assertion if you're interested in reading up on it.

There are a few ways around it, none are particularly pleasant.

You can use something like robocopy to generate a file list. It doesn't suffer from the problem and therefore can do that for you. Then you would parse the resulting list to do what you were doing with gci.

robocopy c:\source c:\doesntexist /l /ts /s

Open in new window

L forces it to list only (not copy), TS adds the TimeStamp and S recurses.

I do have an alternative, but you're getting into a fairly complex area of PowerShell writing interop wrappers for native APIs. Would you like some code? I have some, but it's a good couple of hundred lines long (some of it C#) to replace that one line.

Davis McCarnOwnerCommented:
Actually; its not a limitation of .NET, but rather a limitation of the NTFS filesystem and it has other consequences.  CHKDSK can't fix the drive anymore, the files may not be being backed up, and you definitely can't restore them with anything but an image backup of the drive!
The generally accepted fix is to create a new share of one of the subfolders such that exploring it stays under 255 characters then rename the files or the folders to shorten the path.  You can test by copying a few files using the original share.
Do not ignore this problem as it can seriously bite you in the butt!
Chris DentPowerShell DeveloperCommented:
It's not as clear cut at that.

It is entirely possible, common even, to have paths longer than 260 characters. .NET (and languages or tools derived from that, such as PowerShell) cannot natively deal with this.

Other applications, such as robocopy, use lower-level APIs and Unicode paths and have less trouble (at the very least can work with them). If this weren't so it would simply be impossible to have a long path at the operating system level.

David Johnson, CD, MVPOwnerCommented:
powershell can help you identify the problem children

Get-ChildItem -r * |? {$_.GetType().Name -match "File"  } |? {$_.fullname.length -ge 260} |%{$_.fullname}

you can normally access these by using the following syntax
\\?\D:\very long path

It is not an NTFS restriction unicode can have filenames up to 32,767 characters, but a windows api limitation of MAXPATH

one way to get around this is to use the subst command from an administrators command prompt
i.e. subst X: d:\this\is\a\very\long\path\
now you can access the files underneath d:\this\is\a\very\long\path\ by going to X:

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IT AdminAuthor Commented:
Thank you all, I could not fix it at all but it has helped me the information what you have posted
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