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POLogoff interactive users in Windows from a service
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  1. POLogoff interactive users in Windows from a service
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    copied!<p>I'm trying to figure out a way to log off users in local Windows sessions from a Windows Service written in C#.</p> <p>Here's the background to the problem: I need to manage the computer usage time of a set of users; when their allotted time expires I want to log them off. This is in the context of a W2K8 domain. Unfortunately the login time controls in Windows simply disconnect the user from server resources; there is no way to force their sessions to terminate via this method.</p> <p>My approach is to build a Windows Service that I will deploy across the domain; the service will run on every client computer. At regular intervals the service will enumerate logged-in users on the computer, call out to a database to add the logged-in time since the last call to the total for the day, and if they have reached their maximum, log them out (with a five minute warning). Note - these are NOT terminal services sessions, they are regular local interactive logons. Note also that there may be multiple logons on a machine due to the "switch user" functionality in Win7 &amp; Vista. All my client PCs will be running Win7. The Windows Service will be running as Local System so privileges should not be a problem.</p> <p>I can successfully construct a list of logged-in users on the machine by user name using WMI. Here's a snippet of that code:</p> <hr> <pre><code> List&lt;string&gt; loggedInUsers = new List&lt;string&gt;(); ManagementClass mc = new ManagementClass("Win32_Process"); ManagementObjectCollection moc = mc.GetInstances(); foreach (ManagementObject mo in moc) { ROOT.CIMV2.Process process = new ROOT.CIMV2.Process(mo); string domain, user; uint pid; process.GetOwner(out domain, out user); pid = process.ProcessId; if (process.Name.Trim().ToLower() == "explorer.exe") loggedInUsers.Add(user); } return loggedInUsers; </code></pre> <hr> <p>However, I am struggling to find a method that will allow me to log off a selected user's session. I know I can shut down the machine, but I don't want that - that will kill all users' sessions.</p> <p>Any ideas anyone? Thanks for reading this lengthy post!</p>
 

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