![]() Interestingly, on Windows 10, this is the case regardless of if the Group Policy is Enabled or not. I was able to verify it’s length because neither Command Prompt nor Windows Explorer are able to enter it. CreateDirectoryW however was able to create the full path length. NET Function failed when it saw the path would be too long and gave up. Int lastError = Marshal.GetLastWin32Error() Ĭonsole.WriteLine("CreateDirectory Failure." + lastError) ĬreateDir = Path.Combine(CreateDir, PathParts) If(!CreateDirectory("\\\\?\\" + CreateDir, IntPtr.Zero)) String CreateDir = Path.Combine(PathParts + Path.DirectorySeparatorChar, PathParts,PathParts,PathParts) String PathParts = ProfilePath.Split(Path.DirectorySeparatorChar) ProfilePath = Path.Combine(ProfilePath, "long") Ĭonsole.WriteLine("Constructed Path of length " + ProfilePath.Length) Ĭonsole.WriteLine("Attempting to create path using Directory.Create.") Ĭonsole.WriteLine("Exception attempting to use Directory.Create:" + exx.ToString()) Ĭonsole.WriteLine("Using CreateDirectoryW.") String ProfilePath = Environment.GetFolderPath() Static extern bool CreateDirectory(string lpPathName, ![]() NET API, and then using CreateDirectoryW: It builds a long path that is 500+ characters long, then attempts to create it using the. To demonstrate this difference, I’ve constructed a crude example in C#. ![]() NET File API doesn’t support Unicode long path names either. Programs such as Windows Explorer don’t send the prefix string and the. It wasn’t well popularized that File API calls should include such prefixes, and furthermore Microsoft’s own, built-in software didn’t even use it properly. However, as it happened, it turned out that this hasn’t been a particularly good solution. The requirement for \\?\ was added to allow older programs that weren’t compatible to continue to function since they would not send the \\?\ prefix, they would continue to work as before. This specified to the function to enable support for longer path names, up to the NTFS maximum of 32768. So with those NT functions, the Unicode version of file functions could accept a \\?\ prefix at the front of the path string. With the introduction of the Unicode API, it was decided that Windows ought to allow for longer paths, particularly as File Systems such as NTFS were being developed that did away with many of those DOS-Derived limitations. Windows 3.1, and Windows 3.x more or less stuck with these same limitations, being mostly built over top of MS-DOS. Adding the path and appropriate null terminator brings the maximum buffersize for a full directory path specification to 260 bytes. the 256 byte path excluded the drive letter and backslash (as noted) and didn’t use a null terminator. This function was defined as “returns the path description without the drive letter and the initial backslash”. This limitation actually dates to MS-DOS, and originates with Interrupt 21h with 47h in the high byte of the accumulator register. But what exact is the limit, how did it come about, and how has it persisted to this day in such a way that, as the setting itself requires, programs need to explicitly declare that they can handle them?įirst, the initial origin. This setting relates to the somewhat ubiquitous 260 character path limit. This setting is found under Administrative Templates\System\File System\NTFS: Starting in Windows 10 Build 14352, a new Group Policy has appeared, “Enable NTFS Long Paths”. In the meantime, I’ll continue to use the Search Program I wrote almost a decade ago in Visual Basic 6 to delete files that are beyond the MAX_PATH limit (it uses my BCFile library which has the ability to support long path names). ![]() Any posts mentioning Long Path tool as an “Alternative” or because you were “encountering the same problem” will be treated as spam. Edit: : I’ve gotten a few comments that for some reason mention “Long Path Tool”. ![]()
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