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Validating and extracting filenames

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Julian Voelcker

I want to provide a facility for users to upload .gif, .jpeg, .jpg and
bmp images to a site and then to extract the file name from a full
path (e.g. C:\temp\image.gif).

I need a regular expression to validate that the user has selected an
suitable image to upload and that the path to it is a valid file path.

Anyone here willing to provide some pointers?

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

Reply to this message...

Terry Voss

I use these:

Public Class Utility

        Public Shared Function JustDrive(ByVal cPath As String) As String
            Dim lcJustDrive As String = Directory.GetDirectoryRoot(cPath)
            Return lcJustDrive.Replace("\", "")
        End Function

        Public Shared Function JustExt(ByVal cFileName As String) As String
            Dim fi As FileInfo = New FileInfo(cFileName)
            Return fi.Extension
        End Function

        Public Shared Function JustFName(ByVal cFileName As String) As String
            Dim fi As FileInfo = New FileInfo(cFileName)
            Return fi.Name
        End Function

        Public Shared Function JustPath(ByVal cPath As String) As String
            Dim lcPath As String = cPath.Trim()
            If lcPath.IndexOf("\"c) = -1 Then
                Return ""
            Else
                Return lcPath.Substring(0, lcPath.LastIndexOf("\"c))
            End If
        End Function

        Public Shared Function JustStem(ByVal cPath As String) As String
            Dim lcFileName As String = JustFName(cPath.Trim())
            If lcFileName.IndexOf(".") = -1 Then
                Return lcFileName
            Else
                Return lcFileName.Substring(0, lcFileName.LastIndexOf("."c))
            End If
        End Function

    End Class

Terry Voss
Developer/Owner
Computer Consulting
Microsoft Certified Partner
http://www.computer-consulting.com
Click here to reveal e-mail address
2403 North Nettleton Street
Spokane WA 99205
Tel: 509-327-7202
Fax: 509-327-2303
http://www.spokaneoutdoors.com

-----Original Message-----
From: Julian Voelcker [mailto:Click here to reveal e-mail address]
Sent: Tuesday, July 02, 2002 7:48 AM
To: aspngregexp
Subject: [aspngregexp] Validating and extracting filenames

I want to provide a facility for users to upload .gif, .jpeg, .jpg and
bmp images to a site and then to extract the file name from a full
path (e.g. C:\temp\image.gif).

I need a regular expression to validate that the user has selected an
suitable image to upload and that the path to it is a valid file path.

Anyone here willing to provide some pointers?

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

| [aspngregexp] member Click here to reveal e-mail address = YOUR ID
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Reply to this message...

dave wanta (VIP)

I don't know that I would use the regex class for something like that...
Between a combination of System.IO and a string array, you should have what
you need.

just going from memory here, but this should work..
using System.IO;

string[] GoodExt = { '.gif','.jpeg','.jpg'};
string UploadedImageName = File1.PostedFile.FileName; //the uploaded name
bool Found = false;
if ( Path.HasExtension( UploadedImageName ) ){

foreach ( string s in GoodExt ){
if ( s.ToUpper() == Path.GetExtension( UploadedImageName ).ToUpper() ){
Found = true;
break;
}

}

}

if ( Found ){
Response.Write ("good image");
}
else{
Response.Write ("nope, bad image");
}

----- Original Message -----
From: "Julian Voelcker" <Click here to reveal e-mail address>
To: "aspngregexp" <Click here to reveal e-mail address>
Sent: Tuesday, July 02, 2002 9:47 AM
Subject: [aspngregexp] Validating and extracting filenames

[Original message clipped]

Reply to this message...

Julian Voelcker

Thanks, but I would like to do the validation before they attempt to upload
the image by checking what is selected using the RegularExpression Validator.

How would I go about this using Regular Expressions
Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom
On Tue, 2 Jul 2002 14:02:25 -0500, Dave wanta wrote:
[Original message clipped]

Reply to this message...

Carlos Magalhaes

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Dus-ascii">
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
5.5.2652.35">
<TITLE>RE: [aspngregexp] RE: Validating and extracting =
filenames</TITLE>
</HEAD>
<BODY>

Hi,


How can you call those functions from another =
class?


CM


 


-----Original Message-----
 From: Terry Voss [<A =
HREF=3D"mailto:Click here to reveal e-mail address">mailto:tvoss@computer-cons=
ulting.com</A>] 
 Sent: Tuesday, July 02, 2002 6:09 PM
 To: aspngregexp
 Subject: [aspngregexp] RE: Validating and extracting =
filenames


I use these: 


Public Class Utility


 =
 Public Shared =
Function JustDrive(ByVal cPath As String) As String
 =
 =
 Dim =
lcJustDrive As String =3D Directory.GetDirectoryRoot(cPath)
 =
 =
 Return =
lcJustDrive.Replace("\", "")
 =
 End =
Function


 =
 Public Shared =
Function JustExt(ByVal cFileName As String) As String
 =
 =
 Dim fi As =
FileInfo =3D New FileInfo(cFileName)
 =
 =
 Return =
fi.Extension
 =
 End =
Function


 =
 Public Shared =
Function JustFName(ByVal cFileName As String) As String
 =
 =
 Dim fi As =
FileInfo =3D New FileInfo(cFileName)
 =
 =
 Return =
fi.Name
 =
 End =
Function


 =
 Public Shared =
Function JustPath(ByVal cPath As String) As String
 =
 =
 Dim lcPath As =
String =3D cPath.Trim()
 =
 =
 If =
lcPath.IndexOf("\"c) =3D -1 Then
 =
 =
 =
 Return =
""
 =
 =
 Else
 =
 =
 =
 Return =
lcPath.Substring(0, lcPath.LastIndexOf("\"c))
 =
 =
 End If
 =
 End =
Function


 =
 Public Shared =
Function JustStem(ByVal cPath As String) As String
 =
 =
 Dim =
lcFileName As String =3D JustFName(cPath.Trim())
 =
 =
 If =
lcFileName.IndexOf(".") =3D -1 Then
 =
 =
 =
 Return =
lcFileName
 =
 =
 Else
 =
 =
 =
 Return =
lcFileName.Substring(0, lcFileName.LastIndexOf("."c))
 =
 =
 End If
 =
 End =
Function


 End =
Class

 

Terry Voss
 Developer/Owner
 Computer Consulting
 Microsoft Certified Partner
 <A HREF=3D"http://www.computer-consulting.com" =
TARGET=3D"_blank">http://www.computer-consulting.com</A>
 Click here to reveal e-mail address
 2403 North Nettleton Street
 Spokane WA 99205
 Tel: 509-327-7202
 Fax: 509-327-2303
 <A HREF=3D"http://www.spokaneoutdoors.com"" target="_blank">http://www.spokaneoutdoors.com"; =
TARGET=3D"_blank">http://www.spokaneoutdoors.com</A>

 

-----Original Message-----
 From: Julian Voelcker [<A =
HREF=3D"mailto:Click here to reveal e-mail address">mailto:Click here to reveal e-mail address</A>]
 Sent: Tuesday, July 02, 2002 7:48 AM
 To: aspngregexp
 Subject: [aspngregexp] Validating and extracting =
filenames


I want to provide a facility for users to upload =
.gif, .jpeg, .jpg and
 bmp images to a site and then to extract the file =
name from a full
 path (e.g. C:\temp\image.gif).


I need a regular expression to validate that the user =
has selected an
 suitable image to upload and that the path to it is =
a valid file path.


Anyone here willing to provide some pointers?


Cheers,


Julian Voelcker
 The Virtual World (UK) Limited
 Cirencester, United Kingdom

 
 

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ID
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Reply to this message...

Terry Voss

Carlos,

Put them in .vb file in your project .

Then

Instantiate utility class anywhere else and use methods of class.

Dim x as utility = new utility()
Dim ext as string = x.justext(fullpath)

Terry Voss
Developer/Owner
Computer Consulting
Microsoft Certified Partner
http://www.computer-consulting.com <http://www.computer-consulting.com/>
Click here to reveal e-mail address
2403 North Nettleton Street
Spokane WA 99205
Tel: 509-327-7202
Fax: 509-327-2303
http://www.spokaneoutdoors.com <http://www.spokaneoutdoors.com/>

-----Original Message-----
From: Carlos Magalhaes [mailto:Click here to reveal e-mail address]
Sent: Wednesday, July 03, 2002 12:09 AM
To: aspngregexp
Subject: [aspngregexp] RE: Validating and extracting filenames

Hi,
How can you call those functions from another class?
CM

-----Original Message-----
From: Terry Voss [ mailto:Click here to reveal e-mail address]
Sent: Tuesday, July 02, 2002 6:09 PM
To: aspngregexp
Subject: [aspngregexp] RE: Validating and extracting filenames
I use these:
Public Class Utility
Public Shared Function JustDrive(ByVal cPath As String) As
String
Dim lcJustDrive As String Directory.GetDirectoryRoot(cPath)
Return lcJustDrive.Replace("\", "")
End Function
Public Shared Function JustExt(ByVal cFileName As String) As
String
Dim fi As FileInfo = New FileInfo(cFileName)
Return fi.Extension
End Function
Public Shared Function JustFName(ByVal cFileName As String)
As String
Dim fi As FileInfo = New FileInfo(cFileName)
Return fi.Name
End Function
Public Shared Function JustPath(ByVal cPath As String) As
String
Dim lcPath As String = cPath.Trim()
If lcPath.IndexOf("\"c) = -1 Then
Return ""
Else
Return lcPath.Substring(0,
lcPath.LastIndexOf("\"c))
End If
End Function
Public Shared Function JustStem(ByVal cPath As String) As
String
Dim lcFileName As String = JustFName(cPath.Trim())
If lcFileName.IndexOf(".") = -1 Then
Return lcFileName
Else
Return lcFileName.Substring(0,
lcFileName.LastIndexOf("."c))
End If
End Function
End Class

Terry Voss
Developer/Owner
Computer Consulting
Microsoft Certified Partner
http://www.computer-consulting.com
Click here to reveal e-mail address
2403 North Nettleton Street
Spokane WA 99205
Tel: 509-327-7202
Fax: 509-327-2303
http://www.spokaneoutdoors.com

-----Original Message-----
From: Julian Voelcker [ mailto:Click here to reveal e-mail address]
Sent: Tuesday, July 02, 2002 7:48 AM
To: aspngregexp
Subject: [aspngregexp] Validating and extracting filenames
I want to provide a facility for users to upload .gif, .jpeg, .jpg and
bmp images to a site and then to extract the file name from a full
path (e.g. C:\temp\image.gif).
I need a regular expression to validate that the user has selected an
suitable image to upload and that the path to it is a valid file path.
Anyone here willing to provide some pointers?
Cheers,
Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

| [aspngregexp] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngregexp.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

| [aspngregexp] member Click here to reveal e-mail address = YOUR ID
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| [aspngregexp] member Click here to reveal e-mail address = YOUR ID |
http://www.asplists.com/asplists/aspngregexp.asp = JOIN/QUIT |
http://www.asplists.com/search = SEARCH Archives
------------------------------------------------------------- This email and
any files transmitted are confidential and intended solely for the use of
the individual or entity to which they are addressed, whose privacy should
be respected. Any views or opinions are solely those of the author and do
not necessarily represent those of the Trencor Group, or any of its
representatives, unless specifically stated. Email transmission cannot be
guaranteed to be secure, error free or without virus contamination. The
sender therefore accepts no liability for any errors or omissions in the
contents of this message, nor for any virus infection that might result from
opening this message. Trencor is not responsible in the event of any third
party interception of this email. If you have received this email in error
please notify Click here to reveal e-mail address For more information about Trencor,
visit www.trencor.net

Reply to this message...

Wayne King (ASP.NET)

Set your:
RegularExpressionValidator.ValidationExpression =3D
".+\.(gif|jpe?g|bmp)"

That will validate that the file's extension is one of: gif, jpg, jpeg,
bmp. However, it will not confirm that the file exists. Using standard
HTML, there is no way (*should* be no way) to confirm on client-side --
before postback -- that a file path is valid. For security reasons, you
cannot write client-side script that will scan a user's hard drive.

If you *really* want to be able to do this, then you'll need to have
your users loosen their browser security settings. For instance in
InternetExplorer, the default setting for "Initialize and script ActiveX
controls not marked as safe" is "Disable". If this is set to enable,
then you should be able to write client-side script that creates an
instance of the Scripting.FileSystemObject, which in turn will allow you
to confirm a file path.

To run this script (that would use the FileSystemObject), you would use
the CustomValidator instead of (or possibly in addition to) the
RegularExpressionValidator. The CustomValidator will call your custom
validation function/script when validation is needed.

-Wayne
This posting is provided "AS IS" with no warranties, and confers no
rights.

-----Original Message-----
From: Julian Voelcker [mailto:Click here to reveal e-mail address]=20
Sent: Tuesday, July 02, 2002 2:24 PM
To: aspngregexp
Subject: [aspngregexp] Re: Validating and extracting filenames

Thanks, but I would like to do the validation before they attempt to
upload=20
the image by checking what is selected using the RegularExpression
Validator.

How would I go about this using Regular Expressions
Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom
On Tue, 2 Jul 2002 14:02:25 -0500, Dave wanta wrote:
[Original message clipped]

Reply to this message...

Julian Voelcker

Thanks Wayne that really helps.

I realise that you can't check a users systems, however I was thinking
along the lines of a regular expression to check that the file path is
correctly formatted.

For example, the file has to have a path - just a filename is a no no.
It has to have either a valid drive name or UNC path.

Looking at Regexlib.com there appears to be some code to do this..

([A-Z]:\\[^/:\*\?<>\|]+\.\w{2,6})|(\\{2}[^/:\*\?<>\|]+\.\w{2,6})

Essentially I want to modify this to only handle the image files as
previously, but don't know where to begin.

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

On Wed, 3 Jul 2002 13:32:13 -0700, Wayne King (ASP.NET) wrote:
[Original message clipped]

Reply to this message...

Wayne King (ASP.NET)

That pattern is a little redundant. It restricts file extensions to 2 to
6 characters. It also doesn't allow lower-case drive letters. Here's a
little cleaner version that should have the same semantics, and allows
lower-case drive letters:
([A-Za-z]:\\|\\{2})[^/:*?<>|]+\.\w{2,6}
or perhaps:
([A-Za-z]:|\\)\\[^/:*?<>|]+\.\w{2,6}

Now, to match only your legal file extensions, this should do it:
([A-Za-z]:|\\)\\[^/:*?<>|]+\.(gif|jpe?g|bmp)

These patterns allow the file and folder names to be composed of any
characters that are not / : * ? < > |

Note the pattern will allow invalid paths like:
C:\\foo.bmp
C:\x\\y.bmp
C:\..\...\x.bmp
\\\x\y.bmp
And potentially undesireable paths like:
C:\x\.bmp

-----Original Message-----
From: Julian Voelcker [mailto:Click here to reveal e-mail address]=20
Sent: Thursday, July 04, 2002 2:15 AM
To: aspngregexp
Subject: [aspngregexp] Re: Validating and extracting filenames

Thanks Wayne that really helps.

I realise that you can't check a users systems, however I was thinking=20
along the lines of a regular expression to check that the file path is=20
correctly formatted.

For example, the file has to have a path - just a filename is a no no.
It has to have either a valid drive name or UNC path.

Looking at Regexlib.com there appears to be some code to do this..

([A-Z]:\\[^/:\*\?<>\|]+\.\w{2,6})|(\\{2}[^/:\*\?<>\|]+\.\w{2,6})

Essentially I want to modify this to only handle the image files as=20
previously, but don't know where to begin.

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom

On Wed, 3 Jul 2002 13:32:13 -0700, Wayne King (ASP.NET) wrote:
[Original message clipped]

[Original message clipped]

Reply to this message...

Julian Voelcker

Thanks Wayne, that is really handy, now to work out how to check to see if
the path is valid.

Out of interest, do you have any recommendations of good resources for
learning about regular expressions?

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom
On Fri, 5 Jul 2002 20:03:48 -0700, Wayne King (ASP.NET) wrote:
[Original message clipped]

Reply to this message...

Wayne King (ASP.NET)

An excellent resource for learning about regular expressions is the book
/Mastering Regular Expressions/ by Jeffrey Friedl and published by
O'Reilly.

-----Original Message-----
From: Julian Voelcker [mailto:Click here to reveal e-mail address]=20
Sent: Wednesday, July 10, 2002 2:04 AM
To: aspngregexp
Subject: [aspngregexp] Re: Validating and extracting filenames

Thanks Wayne, that is really handy, now to work out how to check to see
if=20
the path is valid.

Out of interest, do you have any recommendations of good resources for=20
learning about regular expressions?

Cheers,

Julian Voelcker
The Virtual World (UK) Limited
Cirencester, United Kingdom
On Fri, 5 Jul 2002 20:03:48 -0700, Wayne King (ASP.NET) wrote:
[Original message clipped]

Reply to this message...

	System.IO.Directory
	System.IO.FileInfo
	System.IO.Path
	System.Web.UI.MobileControls.CustomValidator
	System.Web.UI.MobileControls.RegularExpressionValidator
	System.Web.UI.WebControls.CustomValidator
	System.Web.UI.WebControls.RegularExpressionValidator

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