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VBA Function To Validate (Test) A Given PowerPoint File Name

By Chris Newman •  Updated: 06/20/17 •  4 min read
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 a PowerPoint file.

This function tests a given name by saving a .ppt PowerPoint 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 a PowerPoint file. If no errors occur then the function will return a TRUE value.

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

Dim ppt As Presentation

'Create a Temporary PPT file
  On Error GoTo InvalidFileName
    Set ppt = Presentations.Add
    ppt.SaveAs Environ("TEMP") & "\" & FileName & ".ppt", ppSaveAsPresentation
  On Error Resume Next

'Close Temp PowerPoint
  ppt.Close

'Delete Temp File
  Kill Environ("TEMP") & "\" & FileName & ".ppt"

'File Name is Valid
  ValidFileName = True

Exit Function

'ERROR HANDLERS
InvalidFileName:
  'Close Temp PowerPoint
    ppt.Close
  
  'File Name is Invalid
    ValidFileName = False

End Function

Using VBA Code Found On The Internet

Now that you’ve found some VBA code that could potentially solve your Excel automation problem, what do you do with it? If you don’t necessarily want to learn how to code VBA and are just looking for the fastest way to implement this code into your spreadsheet, I wrote an article (with video) that explains how to get the VBA code you’ve found running on your spreadsheet.

Getting Started Automating Excel

Are you new to VBA and not sure where to begin? Check out my quickstart guide to learning VBA. This article won’t overwhelm you with fancy coding jargon, as it provides you with a simplistic and straightforward approach to the basic things I wish I knew when trying to teach myself how to automate tasks in Excel with VBA Macros.

Also, if you haven’t checked out Excel’s latest automation feature called Power Query, I have put together a beginner’s guide for automating with Excel’s Power Query feature as well! This little-known built-in Excel feature allows you to merge and clean data automatically with little to no coding!

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 get 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 that 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!

Keep Learning

Chris Newman

Chris Newman

Chris is a finance professional and Excel MVP recognized by Microsoft since 2016. With his expertise, he founded TheSpreadsheetGuru blog to help fellow Excel users, where he shares his vast creative solutions & expertise. In addition, he has developed over 7 widely-used Excel Add-ins that have been embraced by individuals and companies worldwide.