How to determine if a filename is valid?

Hi, how do I determine if a string entered by the user is a valid filename? Forget the extension part (.*), just the first part, because I'll set the extension myself. The user just has to give the first part.

Yes, this is for Win95. I use Delphi3. I know of one way already, but it relies on an error being generated, and I would prefer a neater (maybe safer?) way.

If the answer you give me does not require trapping an error, and is correct, I'll give you an A. If it does require error trapping, and it's correct, I'll give you a C. If it's wrong, well, it's wrong. :-)
LVL 3
wolfcragAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ZifNabCommented:
Hi wolfcrag,

Don't know if this is such a good solution, but it is one :

{function returns true if filename is correct}

function CheckFileName(Value:TFileName):Boolean;
var i : integer;

begin
 Result := True;
 i := 0;

 { iterate through filename [Value] until : }
 {  Bad character : return false            }
 {  Or checked all characters : return true }

 while result and (i<>length(Value)) do begin
  if Value[i] in ['\','/',':','?','"','<','>','|'] then
   result := false;
  inc(i);
 end;
end;
 
['\','/',':','?','"','<','>','|'] = characters which may not be for a filename. Possibly you should add '.', because you give the extension yourself.
 
Hope I've helped you with this,
Have fun,
c.u. ZifNab;
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
wolfcragAuthor Commented:
ZifNab,

    I'm giving you a B. Why? Well, you missed one: '*' I've decided that I will use your method but will protect it with the error trapping method. Thanks for your help.
0
ZifNabCommented:
Hi wolfcrag,

Well, you're correct, sorry I've missed that '*'. But I'm not really doing it for the points, I just want to help people.

Have fun,
c.u. ZifNab;
0
wolfcragAuthor Commented:
ZifNab,

   That's a rare attribute you have there, ZifNab. Well, not so rare for a Delphi user. ;-)
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.