c – Windows操作系统能够在多长时间内从唤醒定时器唤醒？

Schedule machine to wake up

C#文章如果你不介意：http://www.codeproject.com/Articles/49798/Wake-the-PC-from-standby-or-hibernation

using System;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
using System.ComponentModel;
using System.Threading;

namespace WakeUPTimer
{
    class WakeUP
    {
        [DllImport("kernel32.dll")]
        public static extern SafeWaitHandle CreateWaitableTimer(IntPtr lpTimerAttributes,bool bManualReset,string lpTimerName);

        [DllImport("kernel32.dll",SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetWaitableTimer(SafeWaitHandle hTimer,[In] ref long pDueTime,int lPeriod,IntPtr pfnCompletionRoutine,IntPtr lpArgToCompletionRoutine,bool fResume);

        public event EventHandler Woken;

        private BackgroundWorker bgWorker = new BackgroundWorker();

        public WakeUP()
        {
            bgWorker.DoWork += new DoWorkEventHandler(bgWorker_DoWork);
            bgWorker.RunWorkerCompleted += 
              new RunWorkerCompletedEventHandler(bgWorker_RunWorkerCompleted);
        }

        public void SetWakeUpTime(DateTime time)
        {
            bgWorker.RunWorkerAsync(time.ToFileTime());
        }

        void bgWorker_RunWorkerCompleted(object sender,RunWorkerCompletedEventArgs e)
        {
            if (Woken != null)
            {
                Woken(this,new EventArgs());
            }
        }

        private void bgWorker_DoWork(object sender,DoWorkEventArgs e) 
        {
            long waketime = (long)e.Argument;

            using (SafeWaitHandle handle = 
                      CreateWaitableTimer(IntPtr.Zero,true,this.GetType().Assembly.GetName().Name.ToString() + "Timer"))
            {
                if (SetWaitableTimer(handle,ref waketime,IntPtr.Zero,true))
                {
                    using (EventWaitHandle wh = new EventWaitHandle(false,EventResetMode.AutoReset))
                    {
                        wh.SafeWaitHandle = handle;
                        wh.WaitOne();
                    }
                }
                else
                {
                    throw new Win32Exception(Marshal.GetLastWin32Error());
                }
            }
        }

    }
}

或者从控制面板：http://www.anuko.com/content/world_clock/faq/enable_wake_timers.htm