Handling Unauthorized-access Exceptions When Searching Folders

May 18, 2010

If any directory within a set being searched by the [URL] or [URL] methods contains a junction point, the entire method fails and returns zero results on my tests under VB 2008. I would like to make the call more robust: to return the folders or files not blocked by access restrictions and to note the folders which were blocked. Do those methods offer a means to do this, or is a recursive folder-by-folder call necessary?

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Program Searcher / Access Is Denied Searching Some Folders

Oct 3, 2010

My current project is to search the computer for exe files, I managed to do that easily with a for...each statement. It ran well, but it came to a adminstrator folder, then it said "Access Denied".I understand that you cant access these folders, but i was wondering how to exclude certain directories that the user can't access, like UAC or something.[code]

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Handling Exceptions Within Custom Functions

Jun 2, 2009

All of us use the try catch blocks. But what is the best way of handling errors within custom functions?Display a messagebox to the user when the exception is thrown (if possible within the function), or return a value indicating that an error was found within the function?

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Handling Task Factory Exceptions?

Apr 18, 2011

I have set up a process to create new tasks to handle file processing. A problem arised where I received and unhandled exception error and just clicking on the continue button, the main process continued to run. Now I also found that within the child task I was having a file conflict error and as the tasks run as separate .exe i was under the impression that everything would have been thread safe. So for the first issue here is the task creation in the main process..GProcess is a complete project on its own consisting of 6 classes. This is added as a class library reference to the main process class form1

Public Class Form1
..Private parser as GProcess.module = new GProcess.module()
dim factory as new taskfactory

[code].....

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VS 2010 : Handling Unhandled Exceptions In A DLL?

Aug 29, 2011

How does one handle unhandled exceptions in a DLL? VS doesn't give me the option to add Application Events, I'm guessing because it's a DLL. Do I just have to do it in the main app?

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Assigning Consecutive Properties While Handling Exceptions?

Sep 29, 2010

This was a difficult question to google. I have an Order class with a couple of dozen properties such as ClientReference, ShipMethod, etc. I use databinding to bind this class to an Order form. If a user enters an invalid shipping method, an exception is raised in the ShipMethod property and a validation error is displayed to the user. But I'm trying to use the same Order class within an OrderImport class whose job it is to take a flat file and create multiple orders. The problem occurs if I'm assigning to a dozen of the order fields consecutively, and say the first one causes a validation exception. If I have all dozen assignments occuring within a single try-catch block, the next 11 assignments will be skipped and I'll only be able to record one validation error. I could solve the problem by doing a dozen separate try-catch statements, but that doesn't seem very elegant.

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C# - Common Programming Mistakes In .Net When Handling Exceptions?

May 21, 2010

What are some of the most common mistakes you've seen made when handling exceptions?It seems like exception handling can be one of the hardest things to learn how to do "right" in .Net. Especially considering the currently #1 ranked answer to Common programming mistakes for .NET developers to avoid? is related to exception handling.

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Handling Exceptions With A Specific Error Code Condition?

Apr 28, 2012

When two computers are connected through TCP, and one of them closes and breaks the connection, it throws error 10054 "Remote host forcibly closed the connection".I want to handle this error because I know it will happen more often than not with the application I'm building. In System.Net.Sockets.SocketException, there is an on the error code. But when I run the program, the exception that is being thrown is System.IO.IOException, and the GetType for IOException is the socket exception. I don't know how to handle the socket exception if it's not the root cause of the exception.

Here is the code for my Try Catch block:
For infiniteCounter = 1 To 2
infiniteCounter = 1

[code].....

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VS 2008 Handling Exceptions In Custom Control Library

Oct 21, 2009

So I've made this control that inherits from the treeview control and basically loads objects from active directory into a treeview (url...).All working fine, but as this is the first custom control I have made that I have intended for other people to use, I'm not quite sure how I should approach error handling.I mean, obviously I shouldnt do something like show any exceptions in a messagebox because that might not be what the person that is using the control wants to happen. So do I just write out exception messages to the debug window? Do I swallow exceptions (guessing not)? Do I just totally ignore them so that they are thrown in the user's project?

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VS 2008 Handling Exceptions In Referenced Class Libraries

Jun 8, 2010

i created a Class library (.dll) and loaded it as reference into a main project. In the code for the class i've handled exceptions using try..catch subs, however when debugging the main project exceptions that are handled in the DLL still get thrown! (the class ".vb" file gets loaded into the debugger and the line of the exception shows up)

Up till now i've found it useful that when an unhandled error occurs in the imported reference, it shows up in the main project with tracing back to the referenced class. But i dont want the exceptions that are handled in the reference class to be thrown when debugging the main project!

As you can see the exception thrown was handled with try...catch this class exception.vb belongs to the project that created the class library (.DLL that i referenced). i didnt even load the project that built the reference so it amazes me that it could find the coding class to begin with.

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.net - Handling Exceptions In A Class Library Enveloping A Device Driver

Sep 28, 2011

I am writing a class library that envelopes an USB device driver. This device has its own class library, provided by the hardware vendor.

Very often, especially if you handle with old DLL or COM assemblies, there are methods (functions to be correct) that return TRUE if all was OK, or FALSE if any error happen. Often these methods return information about the error in one of their parameters or separately in a GetLastError method or even if in an OnError event.

Now, normally I handle all native .NET exceptions in my class libray handling locally or re-throwing to the client if the error is useful to know. But what to do with all other errors that are hidden in the vendor's methods? (in the true I have no exceptions, but only returned TRUE or FALSE values).

Let's make an example with the method "CONNECT" that connect the client to the USB device.

I envelope the method in this way:

Public Sub Connect()
oVendorDevice.connect()
End Sub

now if any connection error happen, the vendor's connect method return FALSE. But I do not know why the connection failed. To know why the connection failed I have to call (for example) the method GetLastError that gives me information about the error. (but do not forget that other vendors use other strategies like returning the error in a method's parameter or in a OnError events.

Now, in order to follow a good .NET exception handling strategy I could write something like this:

Public Sub Connect()
Dim res As Boolean = oVendorDevice.connect()
If res = False Then

[Code].....

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Unauthorized Access Error?

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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Unable To Searching Folders?

Aug 22, 2009

i have a folder that contains folders that contain fileslets say i have a folder named schoolin this folder there are other folders for each subject: math folder - physics folder - chemistry folder ....... and so onin each folder, lets say the math folder contains many files for previous quizes and exams, like : midterm2007.pdf - midterm2008.pdf - final2008.doc - final2008.docxnow what i want to do, is a tool that searches the school directory and gets for me all " files " this is what

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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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Skip Hidden Folders When Searching In VB

Apr 19, 2009

so i will try and make this simple, im writing a program in VB 2008 and i need to search through the whole hard drive for a specific file type, in my case they are .psd files so im using this line of code:

[Code]...

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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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Handle Unauthorized Access Exception When Getting Files?

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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Read / Write File - Unauthorized Access Exception?

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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Unauthorized Access Trying To Change Remote Registry On Xp Machines?

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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VS 2008 - Writing To Vista Registry (Unauthorized Access)

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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VS 2008 Unauthorized Access Exception When Writing To App Program Files Directory?

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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Check If Input To Group Number And Number Of Units Are Correct Input By Making Error Handling Exceptions

Sep 23, 2010

Part of my assignment is to check if input to Group Number and Number of Units are correct input by making error handling exceptions...

I have to check the following:
a) group number is neither 501 nor 062
b) number of units are NOT numbers
c) number of units is NOT a positive number

So my first question is, am I checking correctly? 2nd question is, How do I make sure my Exceptions will pertain to their correct respective things (a, b, and c.. above)?

[Code]...

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Searching Multiple Files In Multiple Sub-folders

Mar 30, 2010

I'm developing an application to help law enforcement retrieve and analyze logs and other files left by the use of Pidgin (a multi-protocol messenger client). Right now I'm nearly done, but I want to add the ability to search chat logs for user-defined words or phrases and I don't even know where to begin.

Chat logs are stored as html documents in a folder/sub-folder/sub-folder/sub-folder fashion, where each sub-folder can have dozens of sub-folders inside of it, and the final sub-folder can have dozens if not hundreds of chat logs. If anybody could point me in the right direction, I'd be very grateful.

(Also, this is the first program I've written since about 2005, and I'm essentially teaching myself VB as I go. If you'd like to see what I've cobbled together so far, you can find the program here.)

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Exceptions Must Be Exclusive - Exceptions Will Ever Occur Simultaneously ?

Dec 26, 2009

I've just skipped around a few inbuilt VB classes' methods which throws exception. of all that i've came across, methods may throw multiple exceptions but ALL of them are exclusive, meaning there is no way 2 exceptions will ever occur simultaneously, yea and i was trying to make my class throw 2 exceptions simultaneously, hence this question, must all exceptions be exclusive?

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.net - Listing Folders In Folders - Then Creating Arrays In JS For Each Of The Folders ?

Jun 21, 2010

I have a directory structure as follows;

ad_folder
--folderA
--folderB
--folderC[code]....

at I do not know the number of or the names of the folders, they can be different in different cases, I only have the root path.how I can display folder contents in VB.net and the code worked but couldn't figure out how to create the arrays and display only folders within folders starting with "ad_".

System.IO.DirectoryInfo and System.IO.FileInfo to be used for getting the folders.A literal control can be used to create javascript arrays in ASP.NET. These js arrays can then be used on the client side.

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Specify Which Folders The Treeview Can Access Or Not Access?

Aug 2, 2009

I want to specify which folders the treeview can access or not access(which ever is easiest).The following what I have:

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim getInfo As System.IO.DriveInfo()
getInfo = System.IO.DriveInfo.GetDrives
Dim newNode As TreeNode

[code]....

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Access System Files And Folders?

Jan 19, 2012

When I try to access the folder "System Volume Information" and other system files I get the errorAccess to the path 'H:System Volume Information' is denied.

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Searching An Access Database?

May 30, 2011

I tried looking up Threads that would search through an access database, but I keep running into this:

Quote:

502 Bad Gateway

The server returned an invalid or incomplete response.Is there any threads that would help me? For example, in my program if I wanted to search for a certain customer I would enter their info in text box and it would search through my Access database. I have all ready added the data source and even added a section where they could add in somebody to the database. But I can't seem to get the search part down?

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Searching Data In MS Access Using VB?

Oct 5, 2010

my search function is functional however, it does not behave as what i intended it to be. I have a Text box call Text1 and I have a button called cmdSearch. when i click the cmdSearch, the text in Text will search it in my MS access file here is my code:

Code:
Private Sub cmdSearch_Click()
RS.Open "SELECT * FROM productTB where Pname like '%" & Text1 & "%'", Con

[code].....

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Searching In An Access Database

Sep 14, 2010

I want to ask you a question about searching in access database I have an employee list and this list is consists of ID numbers and name. For ex:

[Code]...

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Searching Within An Access Database?

Jul 14, 2011

I haven't programmed in over a year and I am trying to get this to work. I have a sample database containing 4 columns (First_Name, Last_Name, Emp_Num, and Image). I wanting to type my search criteria in a textbox and search the access database by first and last names. nce the record is found I am wanting to display the name and image for that person. I have already linked my database to my project

[Code]...

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Windows Service Not Able To Access Mapped Folders

Nov 23, 2009

I have a very simple VB.net Windows Service written using VS.net 2008. The program after doing several other functions writes a log in one of the network folders. The code is as shown below: If I change the path from "Y:Activity_Log" to "C:Activity_Log" it is working like a charm.What is the problem if I use Y drive which is a valid one and I am able to access it from other VB.net desktop apps. Please help.

Dim strFile As String = "Y:Activity_Log" & DateTime.Today.ToString("dd-MMM-yyyy") & ".txt"
Dim fs As FileStream = Nothing
Dim activityfolder As String = "Y:Activity_Log"
Dim di As System.IO.DirectoryInfo

[code]....

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Linking To And Searching Through A MS Access Database Using VB?

Nov 22, 2009

I want to connect to a database Ive created using Microsoft Access 2007. Im using Visual Basic 2005. I also want to be able to perform basic tasks such as searching.

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Searching Data In An Access Database?

Apr 28, 2011

I know how to search for one specific number from a single line in an access database using a query, but now I have to search through a whole database and display each instance. Ex) I search the number "1" in column "1" of the database and it has "2" instances. So now I have to take the corresponding data in the rows next to it in order to display them in the label.

search: "1", both results are ID = "1"

results:
dates amount
10/13/2009 $43.00
12/25/2009 $86.00

I know how to put the results for "1" line of a database into the .item field, but im confused on how to search multiple lines of a database and store multiple items. Heres what I have so far...

Private Sub btnShowPay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnShowPay.Click
Dim targetid As String

[Code]....

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Searching For A Record From An Access Database?

Jun 11, 2011

Am working on a movie rental system in VB.NET, but there's a problem. I want a situation whereby the user will have the privilege to search for desired records by typing a search string, then hitting the search button. The results should be shown on a datagridview. Here's my code:

Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click
Dim MovieName As String

[Code].....

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Searching MS Access Database Using Combobox ?

Mar 21, 2011

Im new to db access and Im not quite familiar to searching. How can I search all my field and will show the nearest match for the keyword and will be shown under the combobox the nearest results that it can find in my db. Like searching search engines like Google that you can find their suggestions under the combobox ?

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Delete Directory (Skip Access Denied Folders) ?

Jul 22, 2009

I'm fiddling around with a small program that can delete a directory, including its sub-folders and files.This is the code I'm using: (Note-I found it on the net, I didn't code it myself)

Private Sub filedelete(ByVal filename As String)
Dim filesystemobject As Object
filesystemobject = CreateObject("Scripting.filesystemobject")[code]..........

So on click of button '2' the folders are cleaned out, and on click of button '3' they are deleted - it works great.Now the problem is, if any of the folders in the directory 'test' are not accessible to the current user, the program throws the exception 'Access to the path is denied.Is it possible to skip folders that are not accessible, and just ignore them, and delete the ones that are accessible?What code needs to be added to enable this ability?

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Error When Scanning Dir Info On Access Denied Folders

Jan 7, 2010

I am scanning dir Info to gather data like size and dates but on access denied folders on the bellow code I get access denied error. How can I avoid this error and just skip over folders?[code]

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DB/Reporting :: Searching Across Access Database Fields?

Mar 30, 2010

I use the following code in vb.net to search across several Access database fields, which works well, is there a way to find out WHICH field had the search data in?

[code]
Public Function Incomming_Number(ByVal strNum As String) As String
Dim oConnect As New OleDbConnection
Dim sql As OleDbCommand

[code]....

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VS 2008 - Searching All Files (Access Denied)

Jun 6, 2009

Here is my
vb.net
Module FileCheck
Public BW_AntiCorrupt As New Threading.Thread(AddressOf AntiCorrupt)
Dim THardDrive As String = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
Dim HardDrive As String = THardDrive.Substring(0, THardDrive.IndexOf("") + 1) 'C:
Public ContinueSearch As Boolean = True
[Code] .....

I am having a problem. The IO.Directory.GetFiles code is resulting in error do to the fact that it is trying to access the Temp folder in the Windows folder on drive C:. Apparently that folder is restricted... When the code encounters that folder the code stops retrieving files. Is there a way around this? Is there somewhere i can give my program administrator access? If not then am i able to skip the files in that location?

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Access Custom Resource Folders In VB 2008 Express Edition?

May 4, 2010

I want to save/load/check for existance of text files to a folder I made in my Resources but I don't know how to access them through my code.

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Searching And Displaying Data From A Sequential Access File?

May 27, 2009

Im working on a program that will display a price when an item number is entered in the search box. I have the information in a text file for the program to find it but am unable. I have successfully made it so the items show up in a list box and will show the price when clicked on, but cant get the other one to work.

Here is my code for searching from a search box:

Option Explicit On
Option Strict On
Public Class TryonServices

[code]....

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Searching For Data In Access Then Showing Output With VB 2008

Jul 1, 2009

Searching for data in Access then showing output with VB 2008

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Exception Handling In Base Class For Data Access Layer

Mar 14, 2010

I would like to build a base class for my SQL Data Access Layer. I have most of it based out, but have a question about how to handle errors within the base class. I have a method for ExecuteNonQuery, ExecuteReader, ect...

[Code]...

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Handling Application StartupNextInstance Seems To Trigger Internet Access Event?

Feb 7, 2010

I successfully coded MyApplication_Startup and MyApplication_StartupNextInstance to give my single-instance application access to the command line.  It works fine.  if the application is not running and the user double clicks on a filetype associated with my application, my application starts up and reads in the file that was double clicked on.   That's fine.

However, when the user double clicks on another file (same associated type) when the application is already running, I then (and only then) get a warning (from McAfee in my case) that my application is requesting access to the internet.  I simply click OK to allow access, McAfee goes away, focus shifts to the original instance, and that instance successfully reads in the second file. 

If the user then double clicks on a third file when the application is already running, focus shifts to the running application, it loads the third file, and the internet access warning DOES NOT appear.  Same with all subsequent cases.

Any ideas about why the sudden internet access warning is occuring?  In all the startup and load events, I do not do any internet related things.  Much later, the program will send an email, but that code is far removed from Startup and Load things.My only idea is that perhaps because I have "awakened" the normally hidden ApplcationEvents.vb file (by putting some code in there), maybe I have triggered some sort of handling of the MyApplication_NetworkAvaialabilityChanged event, even though I make no reference to this event anywhere.

Before I added the command line handling stuff, I noticed that the internet access warning would occur only once for each new build.  Susequent execution of the same build would not trigger an internet access warning.  So now it is as if the handling of the StartupNextInstance event is simulating starting up a new build for the first time.  Weird.

One more thing.  I am not deploying this over a network.  I am making a simple .exe by selecting Build from the MVS 2008 menu, then running the .exe by double clicking on it from Windows Explorer.  I am using Visual Basic 2008 Express on Windows XP. 

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