以下代码不会禁用电源按钮,但如果设备关闭,它将在 10 秒内重新打开设备。它还将禁用任何省电功能。
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Text;
namespace Core.Mobile
{
/// <summary>
/// Allows manipulation the power management i.e. system standby
/// </summary>
public static class PowerManipulation
{
#region Private variables
private static System.Threading.Timer _timer = null;
private const int INTERVAL = 10000; //10 seconds
#endregion
#region Public methods
/// <summary>
/// Prevents the application from suspending/sleeping
/// </summary>
public static void DisableSleep()
{
if (_timer == null)
{
_timer = new System.Threading.Timer(new System.Threading.TimerCallback(Timer_Tick), null, 0, INTERVAL);
}
try
{
PowerPolicyNotify(PPN_UNATTENDEDMODE, 1); //Ensure the application still runs in suspend mode
}
catch { }
}
/// <summary>
/// Allows suspend/sleep operations
/// </summary>
public static void EnableSleep()
{
if (_timer != null)
{
_timer.Dispose();
_timer = null;
}
try
{
PowerPolicyNotify(PPN_UNATTENDEDMODE, 0);
}
catch { }
}
#endregion
#region Private methods
/// <summary>
/// Internal timer for preventing standby
/// </summary>
private static void Timer_Tick(object state)
{
try
{
SystemIdleTimerReset();
SetSystemPowerState(null, POWER_STATE_ON, POWER_FORCE);
}
catch { }
}
#endregion
#region PInvoke
private const int PPN_UNATTENDEDMODE = 0x00000003;
private const int POWER_STATE_ON = 0x00010000;
private const int POWER_STATE_OFF = 0x00020000;
private const int POWER_STATE_SUSPEND = 0x00200000;
private const int POWER_FORCE = 4096;
private const int POWER_STATE_RESET = 0x00800000;
/// <summary>
/// This function resets a system timer that controls whether or not the
/// device will automatically go into a suspended state.
/// </summary>
[DllImport("CoreDll.dll")]
private static extern void SystemIdleTimerReset();
/// <summary>
/// This function resets a system timer that controls whether or not the
/// device will automatically go into a suspended state.
/// </summary>
[DllImport("CoreDll.dll")]
private static extern void SHIdleTimerReset();
/// <summary>
/// This function allows the current power state to be manipulated, i.e. turn the device on
/// </summary>
[DllImport("coredll.dll", SetLastError = true)]
static extern int SetSystemPowerState(string psState, int StateFlags, int Options);
/// <summary>
/// This function sets any power notification options
/// </summary>
[DllImport("CoreDll.dll")]
static extern bool PowerPolicyNotify(int dwMessage, int onOrOff);
#endregion
}
}