File Browser - Unauthorized Access Exception

Oct 30, 2010

I am just writing a simple file browser. It works without problems when I point to a specific directory but throws "UnauthorizedAccessException access to the path .... is denied" when I point to drive "C:\" or "D:\".

If Not txtToSearch.Text = Nothing Then
ListBox1.Items.Clear()
FC = 0
For Each foundfile As String In My.Computer.FileSystem.GetFiles("D:\", FileIO.SearchOption.SearchAllSubDirectories, Nothing)
Dim title As String = My.Computer.FileSystem.GetFileInfo(foundfile).Name
If title.Contains(txtToSearch.Text) Then
ListBox1.Items.Add(title)
FC += 1
End If
Next

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Aug 4, 2010

I am creating a file and then trying to read and write to it. I'm coming up with an UnauthorizedAccessException wa unhandled. My question is, How do I get around this properly or otherwise improperly to read and write to my text file?

Imports Scripting
Imports System.IO
Imports System.Security
Imports System.Security.Permissions
Public Class Form1
[Code] .....

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VS 2008 Unauthorized Access Exception?

Jan 10, 2010

Ive created a simple application that works fine when i debug and test it though visual studio but when i deploy the application, download it and install it onto my machine i get an error.basically when the first form loads it checks for a file called "New Folder" in my program files folder on my machine if the file is not there, then it adds the file. the code im using to do this is:

If System.IO.Directory.Exists(My.Computer.FileSystem.SpecialDirectories.ProgramFiles & "New Folder") Then
Exit Sub()

[code]....

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Jan 17, 2011

I am trying to get a list of files using this line of Dim files() As String = IO.Directory.GetFiles("D:", "*.*", SearchOption.AllDirectories)But it errors out on folders that are inaccessible, like the RecycleBin folder & the program stops. So how do I get a list of files in all folders, while skipping the inaccessible one

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Jul 12, 2009

My application creates a file by writing to System.AppDomain.CurrentDomain.BaseDirectory() & "data/" & filename...Now this works fine usually, but I just added a setup utility to the app, so now it installs to the program files directory. It installs correctly and creates the data folder, however when it tries to write the file it gets an exception "unauthorized access".

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Nov 2, 2008

im working on a disk cleaner in VB.net 2008. im running into a unauthorized file exception.

[Code]...

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VS 2010 Access Violation Exception In Web Browser Control?

Sep 8, 2010

win7 64bit, VB express 2010.

I'm working on a project. The main form is a MDI parent, it host a control form. on control form, there is a button. when click it, it will start, say 10, threads.

each thread will open a standard alone form (not mdi). on each form, it has a web browser control. when the form opened, it will start a new thread which makes the web browser control load a url, then depends on the links in that url, it will load another url, and loop for some times. then, the thread stops, and the form closes.

for some reasons, I got this weird exception:

AccessViolationException was unhandled by user code. Attempted to read or write protected memory. This is often an indication that other memory is corrupted.

1) the exception happens randomly, and not always happen. when it happens, it is always some code related with the web browser, i.e.

Not (MDIWebBrowser.ReadyState = WebBrowserReadyState.Complete)

or

MDIWebBrowser.Document.Body.InnerText()

2) I put a try catch in, but, it can not catch this exception. If I just close the exception dialog, sometimes, it keeps running without problems. sometimes, it just pauses the webbrowser control.

so, I did some research. it seems many people had the exact same problem. and it seems the best choice is:

[URL]

I checked all solutions suggested, even manually change the DEP, by using "bcdedit.exe /set {current} nx AlwaysOff"

but, the exception still pops up.

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Apr 17, 2011

I had an exercise where I was supposed to have a button open an openfile dialog box, let the user select a file, then another button that would save the file with the extension ".bak". The author didn't give any clues about manipulating extensions -- but a few chapters back we covered string functions. So, with that in mind, I did the following...

Private Sub btnSaveFile_Click(sender As System.Object, e As System.EventArgs) Handles btnSaveFile.Click
' Where does the extension start

[code].....

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May 4, 2011

I'm trying to write a console application that can modify registry subkeys on remote pc's in the same network. I have it working in my own environment but when I install on the customer machines I'm getting unauthorized access when it hits the OpenRemoteBaseKey. The security settings in the application properties is set to full trust application so I'm not sure why it won't work.

I'm using Visual Studio 2010 and first I just installed it on the customer machine and when it wouldn't work I ran the source code in Visual Studio 2005 which is on the customer machine but got same results.I can run the app directly on the remote machine and it will change the registry subkeys as directed, I just can't do it remotely. RemoteRegistry service is started. Both machines are logged in as administrators.

Here is the source code:

Imports Microsoft.VisualBasic
Imports System
Imports System.IO
Imports System.Security.Permissions

[code]....

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Sep 19, 2009

I'm running Windows Vista with admin privilege and UAC is disabled but still unable to write to windows registry!
My.Computer.Registry.SetValue _
("HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun", _
"Test", "C:Test.exe", Microsoft.Win32.RegistryValueKind.String)

I'm getting error "Unauthorized Access Exception was unhandled."
"Access to the registry key 'HKEY_LOCAL_MACHINE....' is denied."

I've googled the net and found that registry permission elevation is required for admin tasks, Is there away to take registry key ownership through VB.Net code??

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Access Denied Exception While Trying To Delete / Create File?

Apr 10, 2010

I tired this [code]...

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How can I catch 404 error on web browser control?

Try
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Catch ex As Exception
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End Try

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Apr 18, 2012

I was scripting a very basic process manager, with a ListView component, and it was working fine for many days, up until now.Here is the code for getting processes:

Dim Process As New Process()
Dim Count As Integer = 0
ListView1.Items.Clear()[code].....

The line of code where I put "*WIN32 EXCEPTION LINE* keeps running into an error(Win32 Exception was unhandled; Access is denied). Here is the full error description:

System.ComponentModel.Win32Exception was unhandled
ErrorCode=-2147467259
Message=Access is denied[code]....

As I said before, this had been working for several days, up until now.

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[Code]...

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When uploading a file it creates a folder using the userid as the folder name and saves in that folder within a folder called documents e.g. ~documents/77b29079-43d6-4520-bc34-77ae2af1b131/documentname.xls

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Is there something I can do to stop access to these files?? I have tried editing the web.config file to only allow access to certain roles but i could still download a document without logging in.

<location path="documents">
<system.web>
<authorization>

[Code]....

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Oct 16, 2010

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Jun 15, 2010

I've got a vb (desktop) app (not a web app) that needs to connect to my website, I've been told that embedding my MySQL database credentials is a big mistake for several reasons.So, I've built a web script in PHP that runs on my server called web-service.php, it's located at www.example.com/web-service.php.Now, I'm trying to connect with this code:

Code:
Dim hwrRequest As HttpWebRequest = HttpWebRequest.Create("http://www.example.com/web-service.php")
hwrRequest.Method = "POST"
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[code]....

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ddd
Try
Dim post As String

[code]....

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The exception:

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Appears when I try to access a field on my page like this:

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However it works for another field which is the same exact type of field, accessed like this:

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Where could the mismatch and exception be coming from? What could be the fault? The field doesn't have a value when I'm pulling it. Do I have to test for a value different for this number field than I would have to for a text field?

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[Code]...

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Apr 18, 2010

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how can we prevent users from accessing the webpage directly, instead of through the program?

Currently we will be implementing:

HWID Authentication to use the program User-Agent Authentication to access the web page Instant IP Blacklisting to anyone accessing the webpage without the proper User-Agent

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I'm been upgrading an application form VB6 to VB2008

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