AutoLock VHD

$driveLetter = "V:"  # Set your drive letter here
$idleMinutes = 1
$idleThreshold = $idleMinutes * 60

# Define native method for idle detection
Add-Type @"
using System;
using System.Runtime.InteropServices;

public static class IdleTime {
    [StructLayout(LayoutKind.Sequential)]
    struct LASTINPUTINFO {
        public uint cbSize;
        public uint dwTime;
    }

    [DllImport("user32.dll")]
    static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

    public static int GetIdleTimeInSeconds() {
        LASTINPUTINFO lii = new LASTINPUTINFO();
        lii.cbSize = (uint)Marshal.SizeOf(typeof(LASTINPUTINFO));
        if (!GetLastInputInfo(ref lii)) {
            return 0;
        }
        return (Environment.TickCount - (int)lii.dwTime) / 1000;
    }
}
"@

function Get-IdleTime {
    return [IdleTime]::GetIdleTimeInSeconds()
}

Write-Host "Auto-lock script running. Will lock $driveLetter after $idleMinutes minutes of inactivity."

while ($true) {
    $idleTime = Get-IdleTime
    Write-Host "Idle time: $idleTime seconds"

    if ($idleTime -ge $idleThreshold) {
        Write-Host "Idle for $idleTime seconds. Locking drive $driveLetter..."
        manage-bde -lock $driveLetter -ForceDismount

        # Wait for some activity before continuing (reset loop after user returns)
        do {
            Start-Sleep -Seconds 10
            $idleTime = Get-IdleTime
        } while ($idleTime -ge 30)

        Write-Host "User activity detected. Resuming idle monitoring..."
    }

    Start-Sleep -Seconds 30
}