Re: Newbie question re vb.net and iterating files

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"Armin Zingler" <az.nospam@xxxxxxxxxx> schreef in bericht news:#fEw5YhaJHA.2124@xxxxxxxxxxxxxxxxxxxxxxx
MarceepooNu wrote:
I am a newbie learning VB.net.
I have spent a few days, unsuccessfully trying to figure out how to
modify the code below so that I could get a list of:
(1) all the .bat files in the root directory: "E:\”, and
(2) all the .bat files in the root directory: "E:\” and all
directories under it.

Here's the code I copied the code below from a help file:
For Each foundFile As String In My.Computer.FileSystem.GetFiles _
(My.Computer.FileSystem.SpecialDirectories.MyDocuments)
sfilelist = sfilelist & vbCrLf & CStr(foundFile)
'ListBox1.Items.Add(foundFile)
Next
MsgBox(sfilelist)


Could anyone show me how tom odify that code so that I could get a
list of:
(1) all the .bat files in the root directory: "E:\”, and

Dim files = IO.Directory.GetFiles("e:\", "*.bat")

(2) all the .bat files in the root directory: "E:\” and all
directories under it?

Recursion is the key: (untested)

Private Shared Sub CollectBatchFiles( _
ByVal Directory As IO.DirectoryInfo, _
ByVal Collection As List(Of IO.FileInfo))

Collection.AddRange(Directory.GetFiles("*.bat"))

For Each SubDir In Directory.GetDirectories
CollectBatchFiles(SubDir, Collection)
Next

End Sub

Call:
Dim BatFiles As New List(Of IO.FileInfo)

CollectBatchFiles(New IO.DirectoryInfo("e:\"), BatFiles)



...and tell me where I could find information about that?

At the risk of appearing greedy:
(3) Is there a simple way to give such a search "administrative
rights" (I hope I am using these terms correctly)
so that I could run a search for all .bat files on the C drive?

Thanks in advance for any help you have time to give.
Marceepoonu

Search for "Impersonation". I'm afraid, I don't have an example handy. Only
found it via good old pInvoke (LogonUser), and I don't know if there's an
equivalent in the Framework.


Armin



I also couldn`t find a good working equivalant in the framework in the past , so i wrapped it all in a nice class

#### CLASS CODE ######

'Michel Posseth 10-07-2008
Imports System.Security
Imports System.Security.Principal
Imports System.Runtime.InteropServices
Public Class ImpersonateSpecificUser
Implements IDisposable
Private Const LOGON32_LOGON_INTERACTIVE As Integer = 2
Private Const LOGON32_PROVIDER_DEFAULT As Integer = 0
Private impersonationContext As WindowsImpersonationContext
Declare Function LogonUserA Lib "advapi32.dll" (ByVal lpszUsername As String, _
ByVal lpszDomain As String, _
ByVal lpszPassword As String, _
ByVal dwLogonType As Integer, _
ByVal dwLogonProvider As Integer, _
ByRef phToken As IntPtr) As Integer

Declare Auto Function DuplicateToken Lib "advapi32.dll" ( _
ByVal ExistingTokenHandle As IntPtr, _
ByVal ImpersonationLevel As Integer, _
ByRef DuplicateTokenHandle As IntPtr) As Integer

Declare Auto Function RevertToSelf Lib "advapi32.dll" () As Long
Declare Auto Function CloseHandle Lib "kernel32.dll" (ByVal handle As IntPtr) As Long
Public Event eSpecificUserImpersonation(ByVal Success As Boolean)
Private _Impersonated As Boolean
''' <summary>
''' Gets or sets a value indicating whether this <see cref="ImpersonateSpecificUser" /> is impersonated.
''' </summary>
''' <value><c>true</c> if impersonated; otherwise, <c>false</c>.</value>
Public Property Impersonated() As Boolean
Get
Return _Impersonated
End Get
Private Set(ByVal value As Boolean)
_Impersonated = value
End Set
End Property
''' <summary>
''' Initializes a new instance of the <see cref="ImpersonateSpecificUser" /> class.
''' </summary>
''' <param name="UserName">Name of the user.</param>
''' <param name="Password">The password.</param>
''' <param name="Domain">The domain.</param>
Public Sub New(ByVal UserName As String, ByVal Password As String, ByVal Domain As String)
If impersonateValidUser(UserName, Domain, Password) Then
'Insert your code that runs under the security context of a specific user here.
RaiseEvent eSpecificUserImpersonation(True)
Else
'Your impersonation failed. Therefore, include a fail-safe mechanism here.
RaiseEvent eSpecificUserImpersonation(False)
End If
End Sub
''' <summary>
''' Impersonates the valid user.
''' </summary>
''' <param name="userName">Name of the user.</param>
''' <param name="domain">The domain.</param>
''' <param name="password">The password.</param>
''' <returns></returns>
Private Function impersonateValidUser(ByVal userName As String, ByVal domain As String, ByVal password As String) As Boolean
Dim tempWindowsIdentity As WindowsIdentity
Dim token As IntPtr = IntPtr.Zero
Dim tokenDuplicate As IntPtr = IntPtr.Zero
impersonateValidUser = False

If RevertToSelf() Then
If LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, token) <> 0 Then
If DuplicateToken(token, 2, tokenDuplicate) <> 0 Then
tempWindowsIdentity = New WindowsIdentity(tokenDuplicate)
impersonationContext = tempWindowsIdentity.Impersonate()
If Not impersonationContext Is Nothing Then
impersonateValidUser = True
End If
End If
End If
End If
If Not tokenDuplicate.Equals(IntPtr.Zero) Then
CloseHandle(tokenDuplicate)
End If
If Not token.Equals(IntPtr.Zero) Then
CloseHandle(token)
End If
End Function
''' <summary>
''' Undoes the impersonation.
''' </summary>
Public Sub undoImpersonation()
impersonationContext.Undo()
Impersonated = False
End Sub
#Region " IDisposable Support "
Private disposedValue As Boolean = False ' To detect redundant calls
' IDisposable
Protected Overridable Sub Dispose(ByVal disposing As Boolean)
If Not Me.disposedValue Then
If disposing Then
' TODO: free other state (managed objects).
End If
If Impersonated Then 'wees er zeer van dat we weer in een normale context draaien
undoImpersonation()
End If
' TODO: free your own state (unmanaged objects).
' TODO: set large fields to null.
End If
Me.disposedValue = True
End Sub


' This code added by Visual Basic to correctly implement the disposable pattern.
Public Sub Dispose() Implements IDisposable.Dispose
' Do not change this code. Put cleanup code in Dispose(ByVal disposing As Boolean) above.
Dispose(True)
GC.SuppressFinalize(Me)
End Sub
#End Region
''' <summary>
''' Impersonates the specific user_e specific user impersonation.
''' </summary>
''' <param name="Success">if set to <c>true</c> [success].</param>
Private Sub ImpersonateSpecificUser_eSpecificUserImpersonation(ByVal Success As Boolean) Handles Me.eSpecificUserImpersonation
Me.Impersonated = Success
End Sub
End Class


#### END CLASS CODE ####



### USAGE ###


Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Using UImp As New ista.security.UserImpersonate.ImpersonateSpecificUser("Username", "'Password", "Domain")
MsgBox(UImp.Impersonated)
'if above msgbox returned true
'all code in the using block will be run in the context of the impersonated user
' so for instance shares are accessible that are normally only accessible to that user , and you have the rights in these shares of that user etc etc
' the code is thoroughly tested in my company and is in unmodified form in use in a win 2000 , 2003 , 2008 active directory domain with XP and Vista clients



End Using



End Sub
End Class



regards

Michel Posseth


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