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Create Directory where Path exceeds MAX_PATH

Posted on 2013-01-30
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Last Modified: 2013-02-04
I am using Delphi 2007 on Windows

Could you advice how to create folder where path already exceeds MAX_PATH.

ForceDirectories() does not work
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Question by:Allan_Fernandes
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by:Thommy
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It's an operatings system limit!!!
You cannot create paths exceeding MAX_PATH length...
Max Path Max File length Exception
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by:Thommy
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by:Allan_Fernandes
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I am very disappointed with the solutions experts exchange has been providing.
Anyways I have already found the solution.

ps: I cannot tell my customer about above mentioned limitations wherein I am the software professional and he is just a computer user. Today everyone has folders above Max_Path due to unicode
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by:Allan_Fernandes
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I've requested that this question be closed as follows:

Accepted answer: 0 points for Allan_Fernandes's comment #a38838286

for the following reason:

As Mentioned above
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by:Thommy
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The only correct answer to the question is, that it is not possible to create longer paths under windows!!!

Cannot understand why the asker is disappointed about that truth.

I'm very interested in Allan_Fernandes solution.
He should post his solution, otherwise I would have deserved the points...
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Expert Comment

by:aikimark
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The Max_Path applies to API calls when creating directories, renaming files, etc.  In the referenced link, unicode (WCHAR) strings might bump that to ~32k, which is some new knowledge for me.

Since the VCL generally wraps API calls, I would expect that the Max_Path encountered by  Allan_Fernandes is the ~260 character limit.  If he has found a work-around, it is likely to be with some library that bypasses the API limitation.  My guess would be the FileSystemObject library provided by the Scripting Runtime DLL.
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by:Allan_Fernandes
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In combination with \\?\ and the Unicode versions of the Windows API
eg: CreateDirectoryW(PWideChar(WideString(ADir)), nil)
it is possible even in Delphi 2007.
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by:Coralon
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Was going to jump on this, but you already figured the answer out Allan :-)  Using the UNC path, you can bypass the shell restrictions on MAX_PATH and directly access the file system by API.  

I actually had a file named com2.lnk I couldn't delete by any 'standard' method, and I was able to delete it in cmd.exe using \\?\f:\<path>\com2.lnk.

Coralon
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by:Allan_Fernandes
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From what Coralon has said and my solution it is clear that the statement of 'EE Admin' is making is improper.

It is sad that to see that you are not taking our questions seriously. Please advice.
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by:Geert Gruwez
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not all experts know everything
some of us even have a lucky break in pointing in the right direction
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by:Thommy
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Sorry for my imperfect answer!

Agree with Geert, that no expert knows everything and any expert can learn some more...
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Accepted Solution

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Davis McCarn earned 500 total points
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It is possible to exceed the 260 character path and filename limit; but, doing so has serious consequences in that CHKDSK will not be able to repair the drive and you will not be able to restore a backup created with most (99%) backup utilities.  The only workaround is to create a share to a parent folder so the limit is not reached using the share which solves the backup issue only.  In my humble opinion, creating a directory structure which cannot be repaired with CHKDSK is a setup for a major disaster.
P.S. I have over 36 years of, more than full time experience in servicing PC's of every type and 34 years of data recovery.  I have also personally encountered drives where nothing would recover those files which were more than 260 characters out.
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Author Comment

by:Allan_Fernandes
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Firstly let me clear the fact the I do not intend to hurt anyone's feelings or snatch anyone's points. I too am in this field from 25 yrs and my main product is a Desktop Backup/Restore software. Several of my clients have long folders names and I end up losing the orders if I cannot handle that.
All I am asking for is that I need to fall back on experts like you when faced with situations I cannot handle. I have been paying your charges for a long time and yet you will notice me asking questions only after having done my study seriously. I am also aware that you have a strong team and are in the capacity of helping me.
My need is to know how to reach the correct experts ?
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