/// <summary>
/// Function to retrieve the timeGetTime time data.
/// </summary>
private void GetWin32Time()
{
if (!_initialized)
{
Reset();
}
long currentTime = WinMultimediaApi.timeGetTime();
long ticks = Environment.TickCount;
// Handle wrap around every ~50 days.
if (currentTime < _startTime)
{
long diff = uint.MaxValue - _startTime;
_startTime = diff;
currentTime += diff;
}
if (ticks < _startTick)
{
long diff = uint.MaxValue - _startTick;
_startTick = diff;
ticks += diff;
}
unchecked
{
_milliseconds = (currentTime - _startTime);
_currentTicks = ticks - _startTick;
}
}
/// <summary>
/// Function to reset the timer.
/// </summary>
/// <exception cref="Win32Exception">Thrown when timer information cannot be retrieved from the operating system.</exception>
public void Reset()
{
if (WinMultimediaApi.timeGetDevCaps(ref _timeCaps, Unsafe.SizeOf <TIMECAPS>()) != 0)
{
throw new Win32Exception(Resources.GOR_ERR_TIME_CANNOT_BEGIN);
}
if (_lastPeriod != null)
{
int period = _lastPeriod.Value;
EndTiming();
BeginTiming(period);
}
_startTick = Environment.TickCount;
_startTime = WinMultimediaApi.timeGetTime();
_initialized = true;
}
