Define New Valid Folder Name

gmaxey · #1 01-11-2016, 08:10 PM

Cross posted in VBA Express:
http://www.vbaexpress.com/forum/show...335#post336335

I'm working on a project where the user is required to identify a new unique folder name prior to further processing.

If the folder identified already exists processing cannot continue. If the folder identified is invalid (invalid characters or reserved) then processing cannot continue.

The only thing I can think of is:
1) Check if folder exists and
2) Try to create the folder and if it fails ...

I created the following function. Anyone have a better idea?

Code:

Sub Test()
  MsgBox fcnIsNewValidFolderName("Test") 'New valid folder name.
  MsgBox fcnIsNewValidFolderName("My Documents") 'Existing folder - returns false
  MsgBox fcnIsNewValidFolderName("A*B?C") 'Invalid characters in name - returns false
  MsgBox fcnIsNewValidFolderName("PRN") 'Reserved name - returns false
lbl_Exit:
  Exit Sub
End Sub
Function fcnIsNewValidFolderName(strFolder As String) As Boolean
Dim oFSO As Object, oRootFolder As Object, oFolder As Object
  fcnIsNewValidFolderName = True
  Set oFSO = CreateObject("Scripting.FileSystemObject")
  On Error GoTo Err_Root
  Set oRootFolder = oFSO.GetFolder("D:\")
  On Error GoTo Err_Create
  Set oFolder = oRootFolder.SubFolders(strFolder)
  fcnIsNewValidFolderName = False
  GoTo lbl_Exit
CreateReEntry:
  On Error GoTo Err_Last
  'See if a folder can be created using the folder name passed.
  Set oFolder = oFSO.CreateFolder(oRootFolder & Application.PathSeparator & strFolder)
  oFolder.Delete
lbl_Exit:
  Set oFSO = Nothing
  Exit Function
Err_Root:
  fcnIsNewValidFolderName = True
  Resume lbl_Exit
Err_Create:
  Resume CreateReEntry:
Err_Last:
  Beep
  fcnIsNewValidFolderName = False
  Resume lbl_Exit
End Function

gmayor · #2 01-11-2016, 10:56 PM

On what basis is the foldername being created? Is it just a random sequence of letters or letters and numbers, or is there some method behind it?

The FolderExists function on my web site - http://www.gmayor.com/useful_vba_functions.htm will check if the folder name exists, and can be used to quit if the folder name exists. You can adapt the FileNameUnique function to work with Foldernames to append a number if the name exists and the CleanFilename function to vet a name for illegal filename characters, but really it is the original naming that is the main issue.

gmaxey · #3 01-12-2016, 04:43 AM

Who is this mysterious respondent

I already have the basic FolderExists function. If not mistaken it is a part of our collaborative modAddInUtils module. I'll look again at FileNamUnique.

My first stab is to let the user create or "attempt" to create any folder name they like as long as it doesn't already exists and is a valid folder name.

I think I will add a key press event to keep them from entering invalid characters though.

Thanks!

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