Search
Module:
Directory

   Desktop Functions:

   Smart Device Functions:


Show Recent Changes
Subscribe (RSS)
Misc. Pages
Comments
FAQ
Helpful Tools
Playground
Suggested Reading
Website TODO List
Download Visual Studio Add-In

ImpersonateLoggedOnUser (advapi32)
 
.
Summary
Lets the calling thread impersonate the security context of a logged-on user. The user is represented by a token handle.

C# Signature:

[DllImport("advapi32.dll", SetLastError=true)]
static extern TODO ImpersonateLoggedOnUser(TODO);

VB Signature:

Declare Function ImpersonateLoggedOnUser Lib "advapi32.dll" (ByVal hToken As Integer) As Integer

User-Defined Types:

None.

Notes:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secauthz/security/impersonateloggedonuser.asp

Tips & Tricks:

Don't forget to call RevertToSelf when done.

The last param in LogonUser (phToken) can be declared as Integer to work with the following VB.Net sample. The key is making sure it is ByRef vs ByVal.

Sample Code:

Public Sub Logon(ByVal strUser As String, ByVal strPassword As String, ByVal strDomain As String)
    Dim lngLogonType, lngLogonProvider, lngTokenHandle As Integer
    Dim blnResult As Boolean

    lngLogonType = LOGON32_LOGON_INTERACTIVE
    lngLogonProvider = LOGON32_PROVIDER_DEFAULT

    blnResult = RevertToSelf()

    blnResult = LogonUser(strUser, strDomain, strPassword, _
                         lngLogonType, lngLogonProvider, _
                         lngTokenHandle)
    If blnResult Then
        blnResult = ImpersonateLoggedOnUser(lngTokenHandle)
        CloseHandle(lngTokenHandle)
    Else
        MsgBox("Error logging on")
    End If
End Sub

Alternative Managed API:

Do you know one? Please contribute it!

Documentation

Please edit this page!

Do you have...

  • helpful tips or sample code to share for using this API in managed code?
  • corrections to the existing content?
  • variations of the signature you want to share?
  • additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).

 
Access PInvoke.net directly from VS:
Terms of Use
Find References
Show Printable Version
Revisions