CeSetUserNotificationEx无法在指定的时间运行？

[iyond]

我写了个程序，是在手机进入休眠状态4分钟后唤醒。当获取到系统即将进入休眠时，通过调用CeSetUserNotificationEx来设置一个定时器，指定4分钟后运行一个程序。然后在系统Resuming的时候解除这个定时器。

现在有个问题是，这个程序大部分时间运行正常，但是有时候没有在指定的时间运行，而是延迟了好长时间。



下面是程序运行日志，各位注意标红的地方：
[2010-3-4 9:54:42][Nosleep]sleeping now, will add timer. next run time:2010-3-4 9:58:42
[2010-3-4 9:58:42][Nosleep]resuming, clear the timer
[2010-3-4 9:58:57][Nosleep]sleeping now, will add timer. next run time:2010-3-4 10:2:57
[2010-3-4 10:2:57][Nosleep]resuming, clear the timer
[2010-3-4 10:3:12][Nosleep]sleeping now, will add timer. next run time:2010-3-4 10:7:12
[2010-3-4 10:7:12][Nosleep]resuming, clear the timer
[2010-3-4 10:7:27][Nosleep]sleeping now, will add timer. next run time:2010-3-4 10:11:27
[2010-3-4 10:8:56][Nosleep]resuming, clear the timer
[2010-3-4 10:9:11][Nosleep]sleeping now, will add timer. next run time:2010-3-4 10:13:11
[2010-3-4 10:13:11][Nosleep]resuming, clear the timer
[2010-3-4 10:13:26][Nosleep]sleeping now, will add timer. next run time:2010-3-4 10:17:26
[2010-3-4 10:17:26][Nosleep]resuming, clear the timer
[2010-3-4 10:17:41][Nosleep]sleeping now, will add timer. next run time:2010-3-4 10:21:41
[2010-3-4 10:21:41][Nosleep]resuming, clear the timer
[2010-3-4 10:21:56][Nosleep]sleeping now, will add timer. next run time:2010-3-4 10:25:56
[2010-3-4 11:17:15][Nosleep]resuming, clear the timer 这里本来是应该10:25:56运行的，结果11:17:15才运行
[2010-3-4 11:18:14][Nosleep]sleeping now, will add timer. next run time:2010-3-4 11:22:14
[2010-3-4 11:20:2][Nosleep]resuming, clear the timer
[2010-3-4 11:26:42][Nosleep]sleeping now, will add timer. next run time:2010-3-4 11:30:42
[2010-3-4 11:30:42][Nosleep]resuming, clear the timer
[2010-3-4 11:30:57][Nosleep]sleeping now, will add timer. next run time:2010-3-4 11:34:57
[2010-3-4 11:48:34][Nosleep]resuming, clear the timer这里本来是应该11:34:57运行的，结果11:48:34才运行
[2010-3-4 11:48:49][Nosleep]sleeping now, will add timer. next run time:2010-3-4 11:52:49


下面是代码：

void KeepPowerOn()
{
	DWORD cbPowerMsgSize = PM_BROADCAST_QUEUE_SIZE;

	MSGQUEUEOPTIONS options;
	options.dwSize = sizeof(MSGQUEUEOPTIONS);
	options.bReadAccess = TRUE;
	options.cbMaxMessage = cbPowerMsgSize;
	options.dwMaxMessages = 32;
	options.dwFlags = MSGQUEUE_NOPRECOMMIT;
	
	HANDLE hMsgQ = CreateMsgQueue(NULL,&options);

	if(NULL == hMsgQ)
	{
		WriteMessage("[Nosleep]CreateMsgQueue Faild, Error: ",GetLastError());
		return;
	}

	HANDLE hPowerNotify = ::RequestPowerNotifications(hMsgQ,PBT_TRANSITION);
	if(NULL == hPowerNotify)
	{
		WriteMessage("[Nosleep]RequestPowerNotifications Faild, Error: ",GetLastError());
		CloseMsgQueue(hMsgQ);

		return;
	}

	union 
	{                 
         WCHAR buf[PM_BROADCAST_QUEUE_SIZE];
         POWER_BROADCAST powerBroadcast;
	} u;


	DWORD cbRead, dwFlags;
	HANDLE hNotify = NULL;
	while(TRUE)
	{
		WaitForSingleObject(hMsgQ,INFINITE);

		if(!ReadMsgQueue(hMsgQ,&u,cbPowerMsgSize,&cbRead,0,&dwFlags))
		{
			WriteMessage("[Nosleep]ReadMsgQueue Faild, Error: ", GetLastError());
			break;
		}

		POWER_BROADCAST ppb = u.powerBroadcast;

		switch(ppb.Flags)
		{
		case 0x00400000:
			{
				union 
				{
				  FILETIME ft;
				  ULONGLONG ut;
				}t;

				SYSTEMTIME st;
				GetLocalTime(&st);
				DWORD dwSeconds=240;

				SystemTimeToFileTime(&st, &t.ft);
				t.ut+=UInt32x32To64(dwSeconds, 10000000);
				FileTimeToSystemTime(&t.ft, &st);

				char temp[100];
				sprintf(temp,"[Nosleep]sleeping now, will add timer. next run time:%d-%d-%d %d:%d:%d\0",
					st.wYear,
					st.wMonth,
					st.wDay,
					st.wHour,
					st.wMinute,
					st.wSecond);

				WriteMessage(temp);

				CE_NOTIFICATION_TRIGGER cnt;  
				cnt.dwSize = sizeof(CE_NOTIFICATION_TRIGGER);
				cnt.dwType = CNT_TIME;
				cnt.dwEvent = NOTIFICATION_EVENT_NONE;
				cnt.lpszApplication = TEXT("notexits.exe");
				cnt.lpszArguments = TEXT("");

				cnt.stEndTime = st;
				cnt.stStartTime = st;

				hNotify = CeSetUserNotificationEx(NULL,&cnt,NULL);
				if(NULL == hNotify)
				{
					WriteMessage("[Nosleep]CeSetUserNotificationEx faild ", GetLastError());
				}
			}
			break;
		case 0x10000000:
			{				
				WriteMessage("[Nosleep]resuming, clear the timer");
				CeClearUserNotification(hNotify);
			}
			break;
		default:
			break;
		}
	}

	if(hMsgQ)
		::CloseMsgQueue(hMsgQ);
	if(hPowerNotify)
		::StopPowerNotifications(hPowerNotify);

	WriteMessage("Exit now");
}

[儿大不由爷]

我觉得还是case 0x00400000:
处理的问题，来的那个消息不定就是CeSetUserNotificationEx触发的，可能是系统其他部分触发的，检查一下CeSetUserNotificationEx调用的相关代码吧

[yinjiaoo]

我的 在真机上面 指定的时候 可以运行。。

[iyond]

问题找到了。我是在系统将要进入休眠时调用CeSetUserNotificationEx，但有的时候，程序还没有执行到这句代码是，系统已经休眠了，所以设置失败。

有什么方法可以保证运行完我的代码在进入休眠吗？