VBA Function To Validate (Test) A Given File Name

VBA Function To Test A Given File Name

What This VBA Macro Code Does

When you ask your users to supply a file name during your VBA automation, it is important to incorporate some sort of test to ensure it is valid and doesn't cause a treacherous error. The below VBA function will tell you (True or False) whether a given text string can be the name of an Excel file.

This function tests a given name by saving a .xls Excel file to the Temporary Files folder and then immediately deleting it. If the action of saving the file with the given name errors out, then the function knows that the text was not a proper name for an Excel file. If no errors occur then the function will return a TRUE value.

Function ValidFileName(FileName As String) As Boolean
'PURPOSE: Determine If A Given Excel File Name Is Valid
'SOURCE: www.TheSpreadsheetGuru.com/the-code-vault

Dim wb As Workbook

'Create a Temporary XLS file
  On Error GoTo InvalidFileName
    Set wb = Workbooks.Add
    wb.SaveAs Environ("TEMP") & "\" & FileName & ".xls", xlExcel8
  On Error Resume Next

'Close Temporary Workbook file
  wb.Close (False)

'Delete Temporary File
  Kill Environ("TEMP") & "\" & FileName & ".xls"

'File Name is Valid!
  ValidFileName = True

Exit Function

  'Close Temporary Workbook file
    wb.Close (False)

  'File Name is Invalid
    ValidFileName = False

End Function

How Do I Modify This To Fit My Specific Needs?

Chances are this post did not give you the exact answer you were looking for. We all have different situations and it's impossible to account for every particular need one might have. That's why I want to share with you: My Guide to Getting the Solution to your Problems FAST! In this article, I explain the best strategies I have come up with over the years to getting quick answers to complex problems in Excel, PowerPoint, VBA, you name it

I highly recommend that you check this guide out before asking me or anyone else in the comments section to solve your specific problem. I can guarantee 9 times out of 10, one of my strategies will get you the answer(s) you are needing faster than it will take me to get back to you with a possible solution. I try my best to help everyone out, but sometimes I don't have time to fit everyone's questions in (there never seem to be quite enough hours in the day!).

I wish you the best of luck and I hope this tutorial gets you heading in the right direction!

~ Chris