public static DateTime GetLastInputTime()
{
LastInputInfo inputInfo = new LastInputInfo { Size = (uint)Marshal.SizeOf(typeof(LastInputInfo)) };
if (!NativeMethods.GetLastInputInfo(ref inputInfo))
{
int error = Marshal.GetHRForLastWin32Error();
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Unable to get the last input time: 0x{0:X8}", error));
}
return DateTime.UtcNow - TimeSpan.FromMilliseconds(Environment.TickCount - inputInfo.Time);
}
internal static extern bool GetLastInputInfo(
/* [out] */ ref LastInputInfo lastInputInfo);
internal static extern bool GetLastInputInfo(
/* [out] */ ref LastInputInfo lastInputInfo);