handling suspend/hibernate in Windows XP
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From: dr on 4 Apr 2006 10:23 I am trying to add suspend mode support to my application. I am getting the PBT_APMQUERYSUSPEND and PBT_APMSUSPEND event notifications as expected. According to MSDN "The system allows approximately 20 seconds for an application to remove the WM_POWERBROADCAST message that is sending the PBT_APMQUERYSUSPEND event from the application's message queue. If an application does not remove the message from its queue in less then 20 seconds, the system will assume that the application is in a non-responsive state, and that the application agrees to the sleep request. Applications that do not process their message queues may have their operations interrupted. After it removes the message from the message queue, an application can take as much time as needed to perform any required operations before entering the sleep state." How do I remove the message from the queue? I've tried using the Win32 GetMessage() and PeekMessage() calls but it tells me there is no message to retrieve. My end goal is to delay suspend as long as I need to clean-up any outstanding work.
From: Kellie Fitton on 4 Apr 2006 11:28 Hi, You can use the following API to preventing the system from entering the sleeping power state: SetThreadExecutionState() Also, you need to handle the following Windows message and handle the power suspend event accordingly: WM_POWERBROADCAST http://msdn.microsoft.com/library/default.asp?url=/library/en-us/power/base/setthreadexecutionstate.asp http://msdn.microsoft.com/library/default.asp?url=/library/en-us/power/base/wm_powerbroadcast.asp Hope these suggestions helps, Kellie.
From: dr on 4 Apr 2006 12:06 Thanks but I do not want to prevent the system from entering the sleeping power state, I want to delay it once I've received notification that it is entering the sleeping power state - according to the documentation I pasted in my original post from Microsoft I should be able to. "Kellie Fitton" wrote: > Hi, > > You can use the following API to preventing the system from > entering the sleeping power state: > > SetThreadExecutionState() > > Also, you need to handle the following Windows message and handle > the power suspend event accordingly: > > WM_POWERBROADCAST > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/power/base/setthreadexecutionstate.asp > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/power/base/wm_powerbroadcast.asp > > Hope these suggestions helps, > > Kellie. > >
From: Skywing on 4 Apr 2006 12:26 BTW, in Windows Vista and beyond, you are unable to delay or otherwise block power operations in response to those messages. In light of this, I would reconsider your approach and see if you can find a better way without having to delay those events, because you will break with new OS releases. "dr" <dr(a)discussions.microsoft.com> wrote in message news:1537352D-FBEA-4F12-8228-1BAC5205AA30(a)microsoft.com... > Thanks but I do not want to prevent the system from entering the sleeping > power state, I want to delay it once I've received notification that it is > entering the sleeping power state - according to the documentation I > pasted > in my original post from Microsoft I should be able to. > > > "Kellie Fitton" wrote: > >> Hi, >> >> You can use the following API to preventing the system from >> entering the sleeping power state: >> >> SetThreadExecutionState() >> >> Also, you need to handle the following Windows message and handle >> the power suspend event accordingly: >> >> WM_POWERBROADCAST >> >> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/power/base/setthreadexecutionstate.asp >> >> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/power/base/wm_powerbroadcast.asp >> >> Hope these suggestions helps, >> >> Kellie. >> >>
From: Pavel A. on 4 Apr 2006 15:51
"dr" wrote: > I am trying to add suspend mode support to my application. I am getting the > PBT_APMQUERYSUSPEND and PBT_APMSUSPEND event notifications as expected. > According to MSDN "The system allows approximately 20 seconds for an > application to remove the WM_POWERBROADCAST message that is sending the > PBT_APMQUERYSUSPEND event from the application's message queue. If an > application does not remove the message from its queue in less then 20 > seconds, the system will assume that the application is in a non-responsive > state, and that the application agrees to the sleep request. Applications > that do not process their message queues may have their operations > interrupted. After it removes the message from the message queue, an > application can take as much time as needed to perform any required > operations before entering the sleep state." > > How do I remove the message from the queue? This can be surprise for you, but when the app received the PBT... messages, it *aready* has removed them from the queue :) Now just take your time and do whatever you need... --PA |