Visual Basic

File.Exist Not Working Correctly

2-Mar-10 18:45

OK. You're obviously not the first person to want to store an image in a database. So, Google for "insert image <insert database="" engine="" here=""> database vb.net". There's tons of examples.

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Dominick Marciano1-Mar-10 5:08

1-Mar-10 5:08

I have an interesting problem. I store my program settings in an XML file. When the program first starts I check to make sure it exist using

If Not File.Exists(m_SettingsPath) then
    Throw New FileNotFoundException(m_SettingsPath & " could not be found.")
End If

Every time I run the program it throws an exception. The file absolutely exist in the correct directory, and I even confirmed this by enumerating all the file in the directory and it was found. In addition, in the following lines of code the XmlDocument object can open the file without any errors. So I can not figure out why the File.Exists method can not find the file. Any ideas?

Steven J Jowett1-Mar-10 5:59

Steven J Jowett

1-Mar-10 5:59

What does m_SettingsPath contain at the point of checking the file exists?

Steve Jowett
-------------------------
Real programmers don't comment their code. If it was hard to write, it should be hard to read.

Dominick Marciano1-Mar-10 7:09

1-Mar-10 7:09

When I step through the code it contains:

"file:\C:\Documents and Settings\dmarciano\Desktop\Programming\JBX2JBN Suite\JBX2JBN IV\JBX2JBN IV\JBX2JBN IV\bin\Debug\Settings.xml"

It obtains this value by:

m_SettingsPath = App_Path() & "\Settings.xml"

Where:

Public Function App_Path() As String
        Return  System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly.GetName.CodeBase)
End Function

Luc Pattyn1-Mar-10 7:17

1-Mar-10 7:17

The documentation on File.Exists() clearly states:
"The Exists method should not be used for path validation, this method merely checks if the file specified in path exists. Passing an invalid path to Existsl returns false."

Do you really think your string literal is a valid file spec?

Hmmm | :|

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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Dominick Marciano1-Mar-10 7:21

1-Mar-10 7:21

I've always used the File.Exists() to check if a file exist before I try and open it. Is there a better way to do it?

Luc Pattyn1-Mar-10 7:27

1-Mar-10 7:27

DisIsHoody wrote:
I've always used the File.Exists() to check if a file exist

that is good, provided you give it a VALID file path, which you didn't.

DisIsHoody wrote:
I've always used the File.Exists() to check if a file exist before I try and open it

That does not make much sense as there are other reasons why opening a file may fail, e.g. file being in use.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Dominick Marciano1-Mar-10 7:48

1-Mar-10 7:48

I did provide it a valid path though. I checked this by setting a break point and copying the value of m_SettingsPath and putting it into Windows Explorer bar and the file did open so the file path is valid. And the file does open and can be read later in the code if I remove this check.

Luc Pattyn1-Mar-10 7:51

1-Mar-10 7:51

DisIsHoody wrote:
I did provide it a valid path

No, you didn't.
Something that starts with "file:" or "http:" may be fine for Explorer, it isn't a valid file name.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

Thomas Krojer1-Mar-10 19:24

Thomas Krojer

1-Mar-10 19:24

Your answer makes it to easy for him ... he will have no fun while searching the error

How To Convert VB Script To .DLL

Steven J Jowett1-Mar-10 11:07

Steven J Jowett

1-Mar-10 11:07

Validate the Path first with Directory.Exists, this will first ensure the path is valid. I would also output the full path and file name to the debug window, just to check there are no invalid characters like a double backslash.

Steve Jowett
-------------------------
Real programmers don't comment their code. If it was hard to write, it should be hard to read.

karthickmani6328-Feb-10 21:56

karthickmani63

28-Feb-10 21:56

Hi,

I have few user defined functions written in vb script.

I want to convert these functions into .dll.
Can anyone help me on this regard.

Thanks,
Karthick.M

Steven J Jowett28-Feb-10 22:36

Steven J Jowett

28-Feb-10 22:36

There are some differences between VBScript and VB and more so VB.NET.
You will need to recode the VBScript into either VB or VB.NET.

Steve Jowett
-------------------------
Real programmers don't comment their code. If it was hard to write, it should be hard to read.

Dave Kreskowiak1-Mar-10 1:52

1-Mar-10 1:52

You don't. VBScript does not compile down to native code, so there's no (standard) way of doing this. You MIGHT be able to find some compiler out on the web that will, but I seriously doubt it.

You'll have to rewrite your code in either VB6 (not recommended) or VB.NET (highly recommended).

Also, what are you going to be using this .DLL for?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

karthickmani631-Mar-10 19:47

karthickmani63

1-Mar-10 19:47

Thanks Steven & Dave,

I have all user defined function in .vbs format, I want to convert it to .dll so that I can make a single executable exe with this dll.

Regards,
Karthick.M

Dave Kreskowiak2-Mar-10 1:43

2-Mar-10 1:43

karthickmani63 wrote:
I have all user defined function in .vbs format, I want to convert it to .dll so that I can make a single executable exe with this dll.

OK. What part of "You can't do that with VBScript" is difficult to understand?

We've already told you what your options are.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

karthickmani632-Mar-10 19:22

karthickmani63

2-Mar-10 19:22

I Understood that,

But I replied for your below question

Also, what are you going to be using this .DLL for?

Thanks,
Karthick.M

εїзεїзεїз2-Mar-10 1:56

εїзεїзεїз

2-Mar-10 1:56

Dave Kreskowiak wrote:
VB6 (not recommended) or VB.NET (highly recommended)

wondering vb 6 $Shucks | :-\$

Best Regards,
SOFTDEV
If you have knowledge, let others light their candles at it

Dave Kreskowiak2-Mar-10 12:38

Re: GPRS connection timeout

2-Mar-10 12:38

I hope you meant "wondering why not VB6"?

Because it's a dead, unsupported product that taught bad, anti-OOP, habits.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

GPRS connection timeout

ahzarmokhli28-Feb-10 18:04

ahzarmokhli

28-Feb-10 18:04

Hi,
I'm looking for a way to stop HttpWebResponse so that it stop looking for GPRS connction.Right now im using HttpWebResponse to automatically connect to GPRS,the problem is it took long for the GPRS to establish.I need to stop the request in about 10 second.Anyone have any suggestion?

this is the code that i used to turn on the GPRS connection....

Dim myHttpWebRequest As System.Net.HttpWebRequest = CType(System.Net.WebRequest.Create("http://www.google.com"), System.Net.HttpWebRequest)
myHttpWebResponse = CType(myHttpWebRequest.GetResponse(), System.Net.HttpWebResponse)
myHttpWebResponse.close

thanks for your help....

@h3aR

Luc Pattyn1-Mar-10 1:16