How Can I Programmatically Monitor Workstation Lock Duration Across Different Platforms?

Use event handling to monitor workstation lock duration

Programmatically determining the duration of a workstation lockout is a common need in system monitoring and security applications. While multiple approaches exist, this article will explore a cross-platform solution using event handling.

In C#, you can use the SystemEvents.SessionSwitch event to monitor the session status of the machine. When the reason for a session switch is SessionLock or SessionUnlock, the corresponding event handler can record the time and determine the duration of the lock.

using System;
using Microsoft.Win32;

namespace WorkstationLockMonitor
{
    public class Program
    {
        static DateTime? _lockedTime;

        public static void Main()
        {
            SystemEvents.SessionSwitch += SystemEvents_SessionSwitch;
        }

        static void SystemEvents_SessionSwitch(object sender, SessionSwitchEventArgs e)
        {
            if (e.Reason == SessionSwitchReason.SessionLock)
            {
                _lockedTime = DateTime.Now;
            }
            else if (e.Reason == SessionSwitchReason.SessionUnlock)
            {
                if (_lockedTime != null)
                {
                    var duration = DateTime.Now - _lockedTime.Value;
                    Console.WriteLine($"Workstation was locked for {duration.TotalMinutes} minutes");
                }
            }
        }
    }
}

Similar mechanisms exist for subscribing to session change events in other programming languages ​​such as Python or Java. For example, in Python, you can use the win32api module:

import win32api
from datetime import datetime

_lockedTime = None

def session_switch_callback(hwnd, msg, wParam, lParam):
    global _lockedTime
    if msg == win32api.WM_WTSSESSION_CHANGE:
        if lParam == win32api.WTS_SESSION_LOCK:
            _lockedTime = datetime.now()
        elif lParam == win32api.WTS_SESSION_UNLOCK:
            if _lockedTime is not None:
                duration = datetime.now() - _lockedTime
                print(f"Workstation was locked for {duration.total_seconds()} seconds")

win32api.SetWinEventHook(
    win32api.EVENT_SYSTEM_SESSION_CHANGE,
    win32api.EVENT_SYSTEM_SESSION_CHANGE,
    0,
    session_switch_callback,
    0,
    0,
    win32api.WINEVENT_OUTOFCONTEXT
)

By implementing these event-driven methods, you can programmatically track the duration of a workstation lockout, enabling you to monitor user activity patterns for security or performance analysis.

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