关于windows 7下阻止睡眠的问题

按照DDK上的说明，好象不起作用啊，根据阻止不了，在其它系统上是可以的，就是在win7上不行

To fail an IRP_MN_QUERY_POWER request for a system power state, a driver should take the following steps:

Call PoStartNextPowerIrp to indicate that the driver is prepared to handle the next power IRP. (Windows Server 2003, Windows XP, and Windows 2000 only)
Set Irp->IoStatus.Status to a failure status and call IoCompleteRequest, specifying IO_NO_INCREMENT. Do not pass the IRP further down the device stack.
Call IoReleaseRemoveLock to release the previously acquired lock.
Return a failure status from its DispatchPower routine.

windows 7 不再支持没有电源管理功能的硬件鸟。