How do I set max character length of filenames?

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I am currently using the following code to remove the defined special characters and white spaces from any file names within my defined directory:

        For Each file As FileInfo In files
            newName = Regex.Replace(file.Name, "[!@#$%^&*()_ ]", "")
            If (file.Name <> newName) Then
                newPath = Path.Combine(dir, newName)
                file.CopyTo(newPath)
            End If
        Next

Edit: How do I trim the characters of the new file name (newName) to all but the first 26 characters?

Answer:

For Each file As FileInfo In files
            If (file.Name.Length >= 36) Then
                Dim maxLen As Integer = 26 - file.Extension.Length
                newName = ${Regex.Replace(Path.GetFileNameWithoutExtension(file.Name), "[!@#$%^&*()_ ]",
                                    "").Substring(0, maxLen)}{file.Extension}"
                newPath = Path.Combine(dir, newName)
                file.CopyTo(newPath, True)
            ElseIf (file.Name.Length < 36) Then
                newName = Regex.Replace(file.Name, "[!@#$%^&*()_ ]", "")
                If (file.Name <> newName) Then
                    newPath = Path.Combine(dir, newName)
                    file.CopyTo(newPath)
                End If
            End If
        Next

You can use Linq as follows:

Dim dir = "c:\myFolder"
Dim except = "[!@#$%^&*()_ ]".ToArray

For Each file As FileInfo In files
    Dim maxLen As Integer = 26 - file.Extension.Length
    Dim newPath = Path.Combine(dir,
                        $"{New String(Path.GetFileNameWithoutExtension(file.Name).
                        ToCharArray.
                        Except(except).
                        Take(maxLen).
                        ToArray)}{file.Extension}")

    file.CopyTo(newPath, True)
Next

Suppose you have a file with name:

abcdefg_hijk!lm@pno#pq%r(stuvy)x$z.dbf

The newPath output will be:

c:\myFolder\abcdefghijklmpnoqrstuv.dbf

If that is what you need to do.


Edit:

Alternative using RegEx:

Dim except = "[!@#$%^&*()_ ]"

For Each file As FileInfo In files
    Dim maxLen As Integer = 26 - file.Extension.Length
    Dim newName = $"{Regex.Replace(Path.GetFileNameWithoutExtension(file.Name),
                                    except,
                                    "").Substring(0, maxLen)}{file.Extension}"
    Dim newPath = Path.Combine(dir, newName)
    file.CopyTo(newPath, True)
Next

So the newPath for a file with name:

n_BrucesMiddle NH 12 34 5 W3_H.dbf

... will be:

c:\myFolder\nBrucesMiddleNH12345W3.dbf

The unwanted characters have been removed and the maximum length of the new file name (newName) including the extension is 26.

Here's regex101 example.

Again, if that is what you need. Good luck.

Naming Files, Paths, and Namespaces, There are a number of different possible answers, depending on exactly what you're asking about. � First of all, most limits are really set by the file system, not the� For Each file As FileInfo In files If (file.Name.Length >= 36) Then Dim maxLen As Integer = 26 - file.Extension.Length newName = ${Regex.Replace(Path.GetFileNameWithoutExtension(file.Name), "[!@#$%^&*()_ ]", "").Substring(0, maxLen)}{file.Extension}" newPath = Path.Combine(dir, newName) file.CopyTo(newPath, True) ElseIf (file.Name.Length < 36) Then newName = Regex.Replace(file.Name, "[!@#$%^&*()_ ]", "") If (file.Name <> newName) Then newPath = Path.Combine(dir, newName) file.CopyTo(newPath

Use String.Remove

newName = newName.Remove(26)

Note that: string length should be greater than or equal to 26

EDIT: If you want the extension to remain. use this instead:

newName = newName.Remove(26, newName.length - 30)

What is the maximum character limit for file names in windows 10 , Before Windows 95, Windows only allowed file names that were eight characters long, with This new setting won't necessarily work with every application out Running the “Remove 260 Character Path Limit” hack sets the� In the past the maximum supported file length was 260 characters (256 usable after the drive characters and termination character). In Windows 10 long file name support can be enabled which allows file names up to 32,767 characters (although you lose a few characters for mandatory characters that are part of the name).

To rename files you can use .MoveTo method. From the docs:

Moves a specified file to a new location, providing the option to specify a new file name.

You probably want to rename only the "name" part so extension remain unchanged. This approach will support any file extension (not only extension with 3 characters)

For Each file As FileInfo In files
    Dim newName As String = Path.GetFileNameWithoutExtension(file.Name).Remove(26)

    Dim newPath = Path.Combine(file.DirectoryName, $"{newName}{file.Extension}")
    file.MoveTo(newPath)
Next

How to Make Windows 10 Accept File Paths Over 260 Characters, ext2, ext3, ext4, zfs: no pathname limits; 255 bytes filename limit. But I can easily create paths much longer than 4096 characters. Instead see PATH_MAX as a� There was a time when you couldn’t have filenames longer than 8 characters plus a 3-character file extension. The best you could do was something like myresume.doc. This was a restriction in place by the design of the file system. Things got better as new versions of Windows came out.

If you are asking how to get a subset of a String, you would get the Substring. If you want the first 26 characters it would be the second overload.

Example:

Dim filename As String = "this is a terrible f^ln@me! that is (way) too long.txt"
Dim newFilename As String = Regex.Replace(filename, "[!@#$%^&*()_ ]", String.Empty).Substring(0, 26)

Live Demo: Fiddle

Update

As per your comment, here is how you'd trim down just the filename without the extension:

Dim filename As String = "this is a terrible f^ln@me! that is (way) too long.txt"
Dim extension As String = Path.GetExtension(filename)
Dim shortFilename As String = Path.GetFileNameWithoutExtension(filename)
Dim newFilename As String = Regex.Replace(shortFilename, "[!@#$%^&*()_ ]", String.Empty).Substring(0, 26) & extension

Live Demo: Fiddle

Filename length limits on linux?, A. In the past the maximum supported file length was 260 characters (256 usable In Windows 10 long file name support can be enabled which allows file Double click LongPathsEnabled; Set to 1 and click OK; Reboot. For that example case there is no file path length limitation by Mp3tag. This is the same behaviour like Windows XP Explorer application. 258characters maximal length for a filepathname in the root folder of a disk. 259characters maximal length for a filepathname in a subfolder of a disk.

Enable long file name support in Windows 10, Windows has a limitation where the entire path to a file cannot be over 255 characters. Microsoft has a command line copy program called "Robocopy" (Robust Copy) that can copy files without this limitation. ROBOCOPY will accept UNC pathnames including UNC pathnames over 256 characters long.

That was for a secondary NC program filename where we used the revision and NC machine code with operation number in the name. For our standard engineering part numbers, we only needed 18 characters and those were also a special use naming. The corporate 'standard' file name was 7 characters in length.

The Windows API has many functions that also have Unicode versions to permit an extended-length path for a maximum total path length of 32,767 characters. This type of path is composed of components separated by backslashes, each up to the value returned in the lpMaximumComponentLength parameter of the GetVolumeInformation function (this value

Comments
  • What are you ACTUALLY asking? a file name is a String. Are you asking how to trim all but the first 26 characters from a String? It's up to you to analyse your problem and determine the specific issue you're having. The question you have asked is actually far broader then you think.
  • You can use If-Else statement to prompt user or you can just trim the string. It depends on what you want.
  • My apologies for the original broadness or vagueness of my initial question. I've since edited, but yes - I am looking to trim all but the first 26 characters of the "newName".
  • Thank you. I tried this out, but I noticed it changed the file names beyond just the characters/white spaces I need to remove. Example: "n_BrucesMiddle NH 12 34 5 W3_H" became nBrucesMidlNH1234W? Why is this occuring? - I'm quite new to this and perhaps not wording my questions well, but in reality, in addition to removing special characters and white spaces, I really just need to shorten any file name (not including the extensions) to a maximum of 26 characters. Just the end of the filename can be removed if it surpasses. Otherwise, if the filename is shorter it does not need to be changed.
  • Is there a means of not including the extension in the count of 26? For example, "abcdefghijklmpnopqrstuvyxz.dbf" is 30 characters long, but calling to remove anything beyond 26 removes the extension and the file.copy fails.
  • Is there a way of excluding the extension from the substring count? For example, "abcdefghijklmpnopqrstuvyxz.dbf" is 30 characters long, but calling the substring of (0, 26) removes the extension and the file.copy fails.
  • Before trimming down the String you will want to convert the string to a Path. Once you have the path, you can get the extension, trim down your String to 26 characters, and then append the extension back.