Pocket PC FAQ Forums

[ronwca]

Is there a way to allow a HP360LX with a SMC EZ PC card (or any LAN card in general) to auto suspend if the external power fails?

The machine runs unattended, and I'd rather it suspends if the power fails, and turns back on with the return of external power. The alternative is that the battery can be rundown to the point where even if the power is restored, the machine is out cold - A physical reset is needed.

Any simple CE 2.0 registry entries for this, or does my program need to just poll the System Power Status?
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Ron W

[ChrisDeHerrera]

Hi,
I do not know of a registry setting to have the device suspend automatically when the power fails. So you would have to create an app to do it.
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Chris De Herrera
Microsoft MVP - Mobile Devices & Tablet PC
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[ronwca]

Thanks Chris, I was afraid of that. Any tips on power management API calls available on a CE 2.0 system? I have loaded PocketC and CEAPI on my HP...never had to use the CEAPI yet though!
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Ron W

[ronwca]

In PocketC with CEAPI, I found that the following codes in loop would work nicely:

definitions:
#include "/pocketc/winbase.h" //CEAPI definitions
#include "/pocketc/winuser.h"
#define VK_OFF 0xDF

portion of a loop called every second:

GetSystemPowerStatusEx(&rStatus,FALSE); // check line power
if (rStatus.ACLineStatus==AC_LINE_OFFLINE) {
keybd_event(VK_OFF, 0, 0, 0); // down
keybd_event(VK_OFF, 0, 2, 0); } // up

The FALSE lets it just check the cached value, rather than taking the time to do the inquiry from the device driver. I don't need it taking any more time than necessary.
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Ron W