Is there any Win32 API for waking up a system that has been shut down, at a specific time? I have seen a program named Autopower On which is able to power the system on at a specified time.
A:
This Wake on LAN (WOL) code project post might be of use (Both motherboard and NIC must support WOL)
Mitch Wheat
2010-10-31 04:32:13
+3
A:
Got the below post from a site. Any body tried this?
Nothing in the framework, so you'll have to "PInvoke" a bit. The API's you need to call are CreateWaitableTimer and SetWaitableTimer. Following is a complete (Q&D) sample that illustrates how you can set a system to be awoken from sleep/hibernate using above Win32 API's. Note that here I'm setting a relative wakeup time of 300000000 nSecs. That means that the computer will wake-up (supposing he's asleep or hibernating) within 30 seconds after setting the timer. Consult the MSDN docs for details on SetWaitableTimer and it's arguments.
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace Willys
{
class Program
{
[DllImport("kernel32.dll")]
public static extern IntPtr CreateWaitableTimer(IntPtr lpTimerAttributes,
bool bManualReset, string lpTimerName);
[DllImport("kernel32.dll")]
public static extern bool SetWaitableTimer(IntPtr hTimer, [In] ref long
pDueTime, int lPeriod, IntPtr pfnCompletionRoutine, IntPtr
lpArgToCompletionRoutine, bool fResume);
[DllImport("kernel32", SetLastError = true, ExactSpelling = true)]
public static extern Int32 WaitForSingleObject(IntPtr handle, uint
milliseconds);
static void Main()
{
SetWaitForWakeUpTime();
}
static IntPtr handle;
static void SetWaitForWakeUpTime()
{
long duetime = -300000000; // negative value, so a RELATIVE due time
Console.WriteLine("{0:x}", duetime);
handle = CreateWaitableTimer(IntPtr.Zero, true, "MyWaitabletimer");
SetWaitableTimer(handle, ref duetime, 0, IntPtr.Zero, IntPtr.Zero, true);
uint INFINITE = 0xFFFFFFFF;
int ret = WaitForSingleObject(handle, INFINITE);
MessageBox.Show("Wake up call");
}
}
}
vishnu
2010-10-31 04:50:32
I edited the program so it works. I've verified that it wakes my computer up from sleep and hibernation. I don't expect it to wake up from being shutdown, however.
Gabe
2010-10-31 05:18:48
@Gabe: ok. thanks for editing
vishnu
2010-10-31 10:20:39