Определение времени простоя компьютера: Справочник по C#

[StructLayout(LayoutKind.Sequential)]
struct LASTINPUTINFO
{
public static readonly int SizeOf = Marshal.SizeOf(typeof(LASTINPUTINFO));

[MarshalAs(UnmanagedType.U4)]
public UInt32 cbSize;
[MarshalAs(UnmanagedType.U4)]
public UInt32 dwTime;
}

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

static int GetLastInputTime()
{
int idleTime = 0;
LASTINPUTINFO lastInputInfo = new LASTINPUTINFO();
lastInputInfo.cbSize = (UInt32)Marshal.SizeOf(lastInputInfo);
lastInputInfo.dwTime = 0;

int envTicks = Environment.TickCount;

if (GetLastInputInfo(ref lastInputInfo))
{
int lastInputTick = (Int32)lastInputInfo.dwTime;

idleTime = envTicks - lastInputTick;
}

return ((idleTime > 0) ? (idleTime / 1000) : 0);
}

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