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

LogonUser (advapi32)
 
.
Summary
allows you to programmatically log on a user.

C# Signature:

[DllImport("advapi32.dll", SetLastError=true)]
public static extern bool LogonUser(
    string lpszUsername,
    string lpszDomain,
    string lpszPassword,
    int dwLogonType,
    int dwLogonProvider,
    out IntPtr phToken
    );

VB .NET Signature:

Declare Auto Function LogonUser 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

User-Defined Types:

None.

Notes:

See MSDN docs for description of various logon types etc.

Tips & Tricks:

Please add some!

Sample Code:

const int LOGON32_LOGON_INTERACTIVE       = 2;
const int LOGON32_LOGON_NETWORK       = 3;
const int LOGON32_LOGON_BATCH         = 4;
const int LOGON32_LOGON_SERVICE       = 5;
const int LOGON32_LOGON_UNLOCK        = 7;
const int LOGON32_LOGON_NETWORK_CLEARTEXT = 8;
const int LOGON32_LOGON_NEW_CREDENTIALS   = 9;

const int LOGON32_PROVIDER_DEFAULT    = 0;4654564546

IntPtr hToken;
IntPtr hTokenDuplicate;

if (LogonUser(username, domain, password,
     LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, out hToken))
{
     if (DuplicateToken(hToken, 2, out hTokenDuplicate))
     {
     WindowsIdentity windowsIdentity = new WindowsIdentity(hTokenDuplicate);
     WindowsImpersonationContext impersonationContext = windowsIdentity.Impersonate();
    // ...
     impersonationContext.Undo();  
     }
}

if (hToken != IntPtr.Zero) CloseHandle(hToken);
if (hTokenDuplicate != IntPtr.Zero) CloseHandle(hTokenDuplicate);

Alternative Managed API:

TODO

Documentation
LogonUser on MSDN

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