Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

how to log off the interactive user from a service

Posted on 2001-07-02
3
204 Views
Last Modified: 2010-04-06
Hi there,

I have written a Windows NT service in delphi, which runs as the local SYSTEM account.

This service though, needs to know who the current logged on user is, and under certain circimstances, log off that user.

If I ask for the "CurrentUser" the answer I get is SYSTEM. I need to know who is loggued on as Interactive user (on the console) and again, log off that user.

My sservice was created with Delphi 5 Ent. and runs on Windows 2000 Professional.

Best regards,

Luis
0
Comment
Question by:elkavayo
  • 2
3 Comments
 

Author Comment

by:elkavayo
ID: 6246504
I don't know if I made myself clear:

1.- The service runs under the local SYSTEM account.

2.- I need to get the username of the user that's loggued onto the computer (whoever user sits in front of the computer and logs in)

3.- Log off that user if for example, its logon time expires (let's say every user is granted 15 minutes of computer time, it's just an example)
0
 
LVL 13

Accepted Solution

by:
Epsylon earned 100 total points
ID: 6246525
As long as the service is able to interact with the desktop yoy can use this to get the current logged-in user:


function GetCurrentUser: String;
var h: HWND;
    dwProcessId: DWORD;
    hProcess, hToken: THandle;
    a: array[0..255] of Char;
    s: Cardinal;
begin
  h := FindWindow('Progman', nil);
  GetWindowThreadProcessId(h, @dwProcessId);
  hProcess := OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);
  OpenProcessToken(hProcess, TOKEN_ALL_ACCESS, hToken);
  ImpersonateLoggedOnUser(hToken);
  s := sizeof(a);
  GetUserName(a, s);
  Result := a;
  RevertToSelf;
  CloseHandle(hToken);
  CloseHandle(hProcess);
end;


It's just a rough example (no error checking).

To log the user off try ExitWindows or ExitWindowsEx.
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 6246532
Like this:

ExitWindowsEx(EWX_FORCE or EWX_LOGOFF, 0);
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question