Valid file name

[Jack Russell]

Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

[Adamz5]

Hi Jack,

Simply do a check to see if file.exists

if file exists it is a valid path if not path was invalid.

--Or to open a file -- prompt the user with a file dialogue box.

hope this helps

Adam

Jack Russell wrote:

Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

[Jack Russell]

Adamz5 wrote:

Hi Jack,

Simply do a check to see if file.exists

if file exists it is a valid path if not path was invalid.

--Or to open a file -- prompt the user with a file dialogue box.

hope this helps

Adam

Jack Russell wrote:

>>Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

I tried file exists (before posting) with an invalid name - a/b.txt and
it did not throw an exception (much to my surprise)

Jack

[Adamz5]

try this

regards

Adam

Imports System.IO

Public Class Form1

Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
' Dim f As File

If File.Exists("c: \a/b.txt ") Then
MsgBox("validpa th")
Else
MsgBox("invalid path")
End If

End Sub
End Class

[Simon Verona]

This would report an invalid path even if the filename is syntactically
correct but just doesn't exist!

Simon

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Simon Verona
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Stewart House
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Julian Way
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Tel: [phone]
Fax: [phone]

"Adamz5" <ad****@hotmail .comwrote in message
news:11******** *************@b 68g2000cwa.goog legroups.com...

try this

regards

Adam

Imports System.IO

Public Class Form1

Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
' Dim f As File

If File.Exists("c: \a/b.txt ") Then
MsgBox("validpa th")
Else
MsgBox("invalid path")
End If

End Sub
End Class

[Adamz5]

Okay here you go...
full code to check file name.
'place a textbox on form write text into it and then press button 1
'place this code in the button1_click event to check that the filename
entered in textbox 1 is fine

Dim uservalue As String
uservalue = TextBox1.Text
Dim b As Boolean = False

b = uservalue.Conta ins("/") Or uservalue.Conta ins("?") _
Or uservalue.Conta ins(":") _
Or uservalue.Conta ins("*") _
Or uservalue.Conta ins("""") _
Or uservalue.Conta ins("<") _
Or uservalue.Conta ins(">") _
Or uservalue.Conta ins("|") _
Or uservalue.Conta ins("?")

If b = False Then
MsgBox("Valid Filename")
Else
MsgBox("Invalid Filename")
End If

By the way this is the long way (not that long is it?)

Anyway hope this helps

Regards

Adam

[Patrice]

Which version ?

2.0 has a System.IO.Path. GetFullPath that should raise an Argument exception
if the path contains invalid chars (the same class exposes info about
forbidden chars for file names and paths).

--
Patrice

"Jack Russell" <ja***@norubbis h.tpg.com.aua écrit dans le message de news:
OV************* *@TK2MSFTNGP03. phx.gbl...

Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

[Jack Russell]

Adamz5 wrote:

Okay here you go...
full code to check file name.
'place a textbox on form write text into it and then press button 1
'place this code in the button1_click event to check that the filename
entered in textbox 1 is fine

Dim uservalue As String
uservalue = TextBox1.Text
Dim b As Boolean = False

b = uservalue.Conta ins("/") Or uservalue.Conta ins("?") _
Or uservalue.Conta ins(":") _
Or uservalue.Conta ins("*") _
Or uservalue.Conta ins("""") _
Or uservalue.Conta ins("<") _
Or uservalue.Conta ins(">") _
Or uservalue.Conta ins("|") _
Or uservalue.Conta ins("?")

If b = False Then
MsgBox("Valid Filename")
Else
MsgBox("Invalid Filename")
End If

By the way this is the long way (not that long is it?)

Anyway hope this helps

Regards

Adam

Yes that is basically what I did but knowing MS there are other things
that make a file name invalid so I thought there might be a system
function that checked all possibilities. Anyway thanks for everyones
thoughts.

Jack

[Claes Bergefall]

Try Path.GetFileNam e or Path.GetDirecto ryName (or both). Both will throw an
exception if invalid characters are found in the string. If you need a list
of invalid characters you can get them by using Path.GetInvalid FileNameChars
and Path.GetInvalid PathChars

/claes
"Jack Russell" <ja***@norubbis h.tpg.com.auwro te in message
news:OV******** ******@TK2MSFTN GP03.phx.gbl...

Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

[Jack Russell]

Claes Bergefall wrote:

Try Path.GetFileNam e or Path.GetDirecto ryName (or both). Both will throw an
exception if invalid characters are found in the string. If you need a list
of invalid characters you can get them by using Path.GetInvalid FileNameChars
and Path.GetInvalid PathChars

/claes
"Jack Russell" <ja***@norubbis h.tpg.com.auwro te in message
news:OV******** ******@TK2MSFTN GP03.phx.gbl...

>>Is there a simple function to test if a string is a valid file name (i.e
does not contain illegal characters etc) other than doing it the long way?

Thanks

Jack Russell

Thanks for that