filename

[RedLars]

Hi,

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

Any suggestions.

[Cowboy \(Gregory A. Beamer\)]

Re: filename

if(File.Exists( filePathFromTex tBox))
{
//Do work
}
else
{
//Display error
}

Exists has been around since the early days. I believe it was 1.0. It was
definitely 1.1:

http://msdn.microsoft.com/en-us/library/system.io.file_members(VS.71).aspx

--
Gregory A. Beamer
MVP, MCP: +I, SE, SD, DBA

Subscribe to my blog

http://feeds.feedburner.com/GregoryBeamer#

or just read it:

http://feeds.feedburner.com/GregoryBeamer

*************** *************** **************
| Think outside the box! |
*************** *************** **************
"RedLars" <Liverpool1892@ gmail.comwrote in message
news:9e54d9f3-9857-4e17-bcdc-cad21abe2ba9@x3 5g2000hsb.googl egroups.com...

Hi,
>
How can check using .NET 1.1 that a string contains a valid filename
for winxp?
>
The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.
>
Any suggestions.

[=?Utf-8?B?RmFtaWx5IFRyZWUgTWlrZQ==?=]

RE: filename

You should just need to check if the string contains any invalid filename
characters as returned by Path.GetInvalid FilenameChars.

http://msdn.microsoft.com/en-us/library/system.io.path.getinvalidfilenamechars.aspx

"RedLars" wrote:

Hi,
>
How can check using .NET 1.1 that a string contains a valid filename
for winxp?
>
The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.
>
Any suggestions.
>

[rhaazy]

Re: filename

On Sep 24, 9:45 am, RedLars <Liverpool1...@ gmail.comwrote:

Hi,
>
How can check using .NET 1.1 that a string contains a valid filename
for winxp?
>
The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.
>
Any suggestions.

Just check your string to make sure there are no occurences of \
..IndexOf("\");

[Ignacio Machin ( .NET/ C# MVP )]

Re: filename

On Sep 24, 9:45 am, RedLars <Liverpool1...@ gmail.comwrote:

Hi,
>
How can check using .NET 1.1 that a string contains a valid filename
for winxp?
>
The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.
>
Any suggestions.

I do not of any method in File class that check if a name is valid.
the simplest thing is to check for the \ character. You could use a
regular expression to better check for invalid chars.

[OD]

Re: filename

the best is certainly using a regular expression.
following sample check long file name validity :
^[^\\\./:\*\?\"<>\|]{1}[^\\/:\*\?\"<>\|]{0,254}$

--


OD___

https://www.e-naxos.com

[RedLars]

Re: filename

Let me re-phrase the question.

By opening notepad, selecting Save as.. and typing in 'g/fgh.txt' the
application wont save the file because the filename is invalid.

How can I using .NET 1.1 check if a given string contains only a valid
filename? It should not include path and filename.

Thank you.

>On 24 Sep, 15:51, "Cowboy \(Gregory A. Beamer\)" <NoSpamMgbwo... @comcast.netNoS pamMwrote:
if(File.Exists( filePathFromTex tBox))
{
   //Do work}
>
else
{
    //Display error
>
}
>
Exists has been around since the early days. I believe it was 1.0. It was
definitely 1.1:http://msdn.microsoft.com/en-us/libr...members(VS.71)...
>
--
Gregory A. Beamer
MVP, MCP: +I, SE, SD, DBA
>
Subscribe to my bloghttp://feeds.feedburne r.com/GregoryBeamer#
>
or just read it:http://feeds.feedburner.com/GregoryBeamer
>
*************** *************** **************
| Think outside the box!                               |
*************** *************** **************" RedLars" <Liverpool1...@ gmail.comwrote in message
>
news:9e54d9f3-9857-4e17-bcdc-cad21abe2ba9@x3 5g2000hsb.googl egroups.com...
>

Hi,

>

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

>

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

>

Any suggestions.

[Jay Riggs]

Re: filename

On Sep 24, 6:45 am, RedLars <Liverpool1...@ gmail.comwrote:

Hi,
>
How can check using .NET 1.1 that a string contains a valid filename
for winxp?
>
The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.
>
Any suggestions.

RedLars,

If you want to check if a given string could be a valid filename only
(even for files that don't exist), you can use a RegEx.

I've been using this one lately:
^[^ \\/:*?""<>|]+([ ]+[^ \\/:*?""<>|]+)*$

Which I got here:

http://regexlib.com/REDetails.aspx?regexp_id=2286

A word of warning: using just this regex will not allow you to
identify the several strings Windows will not allow for filenames
(such as nul, com1, etc.). I've been regexs that covered includes
there reserved words can can't find it now.


HTH
-Jay

[Jay Riggs]

Re: filename

On Sep 24, 7:48 am, Family Tree Mike
<FamilyTreeM... @discussions.mi crosoft.comwrot e:

You should just need to check if the string contains any invalid filename
characters as returned by Path.GetInvalid FilenameChars.
>
http://msdn.microsoft.com/en-us/libr...getinvalidfile...
>
>
>
"RedLars" wrote:

Hi,

>

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

>

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

>

Any suggestions.- Hide quoted text -

>
- Show quoted text -

Unfortunately, you can't use this method in 1.1.

[=?Utf-8?B?RmFtaWx5IFRyZWUgTWlrZQ==?=]

Re: filename

Oops! You're right, I missed that in the doc. Sorry!

"Jay Riggs" wrote:

On Sep 24, 7:48 am, Family Tree Mike
<FamilyTreeM... @discussions.mi crosoft.comwrot e:

You should just need to check if the string contains any invalid filename
characters as returned by Path.GetInvalid FilenameChars.

http://msdn.microsoft.com/en-us/libr...getinvalidfile...



"RedLars" wrote:

Hi,

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

Any suggestions.- Hide quoted text -

- Show quoted text -

>
>
Unfortunately, you can't use this method in 1.1.
>

[Ignacio Machin ( .NET/ C# MVP )]

Re: filename

Exists has been around since the early days. I believe it was 1.0. It was
definitely 1.1:http://msdn.microsoft.com/en-us/libr...members(VS.71)...
>

I think that he wants to know if a given string is a valid file name,
not to check if a file exist or not

[G.S.]

Re: filename

On Sep 24, 1:07 pm, Family Tree Mike
<FamilyTreeM... @discussions.mi crosoft.comwrot e:

Oops!  You're right, I missed that in the doc.  Sorry!
>
>
>
"Jay Riggs" wrote:

On Sep 24, 7:48 am, Family Tree Mike
<FamilyTreeM... @discussions.mi crosoft.comwrot e:

You should just need to check if the string contains any invalid filename
characters as returned by Path.GetInvalid FilenameChars.

>

>http://msdn.microsoft.com/en-us/libr...getinvalidfile....

>

"RedLars" wrote:
Hi,

>

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

>

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

>

Any suggestions.- Hide quoted text -

>

- Show quoted text -

>

Unfortunately, you can't use this method in 1.1.- Hide quoted text -

>
- Show quoted text -

After checking for invalid characters following the above suggestions,
would it be feasible to try to create a temp file just to see if your
host/target OS will complain?

[Ignacio Machin ( .NET/ C# MVP )]

Re: filename

On Sep 24, 4:27 pm, "G.S." <gstoy...@gmail .comwrote:

On Sep 24, 1:07 pm, Family Tree Mike
>
>
>
<FamilyTreeM... @discussions.mi crosoft.comwrot e:

Oops! You're right, I missed that in the doc. Sorry!

>

"Jay Riggs" wrote:

On Sep 24, 7:48 am, Family Tree Mike
<FamilyTreeM... @discussions.mi crosoft.comwrot e:
You should just need to check if the string contains any invalid filename
characters as returned by Path.GetInvalid FilenameChars.

>

http://msdn.microsoft.com/en-us/libr...getinvalidfile...

>

"RedLars" wrote:
Hi,

>

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

>

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

>

Any suggestions.- Hide quoted text -

>

- Show quoted text -

>

Unfortunately, you can't use this method in 1.1.- Hide quoted text -

>

- Show quoted text -

>
After checking for invalid characters following the above suggestions,
would it be feasible to try to create a temp file just to see if your
host/target OS will complain?

Yes, But that would throw an exception, which is not a very good
approach, you can do something like:

bool isvalid(string str){
try{
string path = Path.GetTempFil eName() + str;
File.Create( path).Close();
File.Delete( path);
return true;
}catch{
return false;
}
}

[Jay Riggs]

Re: filename

On Sep 24, 1:27 pm, "G.S." <gstoy...@gmail .comwrote:

On Sep 24, 1:07 pm, Family Tree Mike
>
>
>
>
>
<FamilyTreeM... @discussions.mi crosoft.comwrot e:

Oops!  You're right, I missed that in the doc.  Sorry!

>

"Jay Riggs" wrote:

On Sep 24, 7:48 am, Family Tree Mike
<FamilyTreeM... @discussions.mi crosoft.comwrot e:
You should just need to check if the string contains any invalid filename
characters as returned by Path.GetInvalid FilenameChars.

>

http://msdn.microsoft.com/en-us/libr...getinvalidfile...

>

"RedLars" wrote:
Hi,

>

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

>

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

>

Any suggestions.- Hide quoted text -

>

- Show quoted text -

>

Unfortunately, you can't use this method in 1.1.- Hide quoted text -

>

- Show quoted text -

>
After checking for invalid characters following the above suggestions,
would it be feasible to try to create a temp file just to see if your
host/target OS will complain?- Hide quoted text -
>
- Show quoted text -

G.S.

After checking for invalid characters in the filename why not just
attempt to save the file where you want it to go and handle any
exceptions as they occur? This seems the more direct approach unless
I'm missing something. Saving to a temp location successfully only
tells you you can save it to the temp location.

-Jay

[Jay Riggs]

Re: filename

On Sep 24, 9:43 am, Jay Riggs <jay.s.ri...@gm ail.comwrote:

On Sep 24, 6:45 am, RedLars <Liverpool1...@ gmail.comwrote:
>

Hi,

>

How can check using .NET 1.1 that a string contains a valid filename
for winxp?

>

The application in question has a textbox where user can enter
filename and only the filename. It should not allowed to enter path
+filename like "c:\tmp\myfile. log" or relative paths "..\tmp
\myfile.log" - no directory info should be allowed, only the filename.

>

Any suggestions.

>
RedLars,
>
If you want to check if a given string could be a valid filename only
(even for files that don't exist), you can use a RegEx.
>
I've been using this one lately:
^[^ \\/:*?""<>|]+([ ]+[^ \\/:*?""<>|]+)*$
>
Which I got here:http://regexlib.com/REDetails.aspx?regexp_id=2286
>
A word of warning: using just this regex will not allow you to
identify the several strings Windows will not allow for filenames
(such as nul, com1, etc.).  I've been regexs that covered includes
there reserved words can can't find it now.
>
HTH
-Jay

Boy, I really mangled the last part of my response above. What I
meant to say was that the regex I provided a link to in my previous
message will check a potential filename for characters that Windows
will not allow, but will not check for filenames that Windows
specifically disallows. Examples include nul, com1, etc.

I found the regex that handles this at the following:

http://regexlib.com/REDetails.aspx?regexp_id=85

I ended up using the modified version found on the first user comment
for the regex. It worked fine for me.

-Jay