I want to know on when was the last time the system was started.
Environment.TickCount will work but it is breaking after 48-49 days because of the limitation of int.
This is the code I've been using:
Environment.TickCount & Int32.MaxValue
Does anyone knows about long type return somehow?
I am using this to know the idle time of the system:
public static int GetIdleTime()
{
return (Environment.TickCount & Int32.MaxValue)- (int)GetLastInputTime();
}
/// <summary>
/// Get the last input time from the input devices.
/// Exception:
/// If it cannot get the last input information then it throws an exception with
/// the appropriate message.
/// </summary>
/// <returns>Last input time in milliseconds.</returns>
public static uint GetLastInputTime()
{
LastInputInfo lastInPut = new LastInputInfo();
lastInPut.BlockSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(lastInPut);
if (!GetLastInputInfo(ref lastInPut))
{
throw new Exception(GetLastError().ToString());
}
return lastInPut.Time;
}
The following code retrieves the milliseconds since system start (call to unmanged API). I measured the performance costs for that interop operation, and it is quite identical to StopWatch() (but that doesn't retrieve the time since system start directly of course).
using System.Runtime.InteropServices;
...
[DllImport("kernel32.dll") ]
public static extern UInt64 GetTickCount64();
...
var tickCount64 = GetTickCount64();
https://msdn.microsoft.com/de-de/library/windows/desktop/ms724411(v=vs.85).aspx