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Tracking system idle time

I am creating a component that has to do windows screen lock based on the system idle time.
Say if the system is idle for 15 mins it should lock the screen. How can I track the system idle time ?
Is there any readymade utility for this ?

Regards
Renjith

ASKER CERTIFIED SOLUTION

AlexFM

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AlexFM

Take a look at this code:

using System;
using System.Runtime.InteropServices;

namespace Test1
{
class Class1
{
[StructLayout(LayoutKind.Sequential)]
struct LASTINPUTINFO
{
public int cbSize;
public int dwTime;
}

[DllImport ("User32.dll")]
static extern void GetLastInputInfo(ref LASTINPUTINFO info);

[DllImport ("Kernel32.dll")]
public static extern int GetTickCount();

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
LASTINPUTINFO info = new LASTINPUTINFO();
info.cbSize = Marshal.SizeOf(info);

GetLastInputInfo(ref info);
int n = GetTickCount();

int nIdle = n - info.dwTime;

Console.WriteLine("Idele time (ms): {0}", nIdle);
}
}
}