/// <summary>
/// Gets a last time of the system change a power state.
/// </summary>
/// <param name="level">Indicates power level information.</param>
/// <returns>Last time of the changing the system power state.</returns>
private static DateTime LastPowerChangedStateTime(PowerInformationLevel level)
{
var lastWakeDuration = GetPowerInformation <long>(level);
var lastSleepTime = DateTime.Now - TimeSpan.FromMilliseconds(PowerManagementNative.GetTickCount64()) +
TimeSpan.FromTicks(lastWakeDuration);
return(lastSleepTime);
}
/// <summary>
/// Wraps CallNtPowerInformationForRead method.
/// </summary>
/// <typeparam name="T">An output buffer type.</typeparam>
/// <param name="level">Indicates power level information.</param>
/// <param name="readOutputBuffer">The output buffer result.</param>
public static void CallNtPowerInformationForRead <T>(PowerInformationLevel level, Action <IntPtr> readOutputBuffer)
{
var outputBufferSize = Marshal.SizeOf <T>();
var outputBuffer = Marshal.AllocHGlobal(outputBufferSize);
PowerManagementNative.CallNtPowerInformation((int)level, IntPtr.Zero, 0, outputBuffer,
(uint)outputBufferSize);
readOutputBuffer.Invoke(outputBuffer);
Marshal.FreeHGlobal(outputBuffer);
}
/// <summary>
/// Wraps CallNtPowerInformationForRead method.
/// </summary>
/// <typeparam name="T">An input buffer type.</typeparam>
/// <param name="level">Indicates power level information.</param>
/// <param name="writeInputBuffer">The function that is responsible for marhaling input parametrs.</param>
public static void CallNtPowerInformationForWrite <T>(PowerInformationLevel level, Action <IntPtr> writeInputBuffer)
{
var inputBufferSize = Marshal.SizeOf <T>();
var inputBuffer = Marshal.AllocHGlobal(inputBufferSize);
writeInputBuffer.Invoke(inputBuffer);
PowerManagementNative.CallNtPowerInformation((int)level, inputBuffer,
(uint)inputBufferSize, IntPtr.Zero, 0);
Marshal.FreeHGlobal(inputBuffer);
}
/// <summary>
/// Suspends the system by shutting power down in hibernation.
/// </summary>
public static void HybernateSystem()
{
PowerManagementNative.SetSuspendState(true, false, false);
}
/// <summary>
/// Suspends the system by shutting power down in a sleep state.
/// </summary>
public static void SleepSystem()
{
PowerManagementNative.SetSuspendState(false, false, false);
}
