🚀 go-pugleaf

Mike Collins wrote:

>All options seem to work except the hibernate / stand-by.  The only way i 
>could find to implement either of these was with SetSystemPowerState(). 
>
>What I need to know is, is there any way to detect or determine if the 
>system can or can't be placed in either of theses modes?

I think you want to look at GetPwrCapabilities()
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/power/base/getpwrcapabilities.asp
I should think that HiberFilePresent would indicate if hibernation is
available.
Don't know what the various SystemS1 sleep states are.

>My second question, (in following with this) is, does my application (or any 
>other running on the system) need to perform any specialist operations 
>before the system is suspended.  For example, we have a hardware polling 
>thread - does this need to be specifically suspended by our application or 
>does the OS take care of these aspects?

Well, that depends on if your hardware/polling can withstand a long
interruption. If your application or the hardware crashes with sleep
or hibernate, then, yes, they should check for those system messages
and take care of themselves.  If they don't care about the missed
polls, then nothing is needed. The app will just go to sleep.