Hello, I have a HTC cruise.

I am writing an app that sends every 20 minutes the GPS position to a central Server. To save the battery i am using the OpenNETCF.WindowsCE.LargeIntervalTimer

I have the problem that the GPS is switched-off when the phone is in "power saving" mode and i had'nt find a way to activate it.

Even when the tick occurs, the devices still in power save mode and the gps is not available.

Is there a way to switch to "full power" mode , using .net 3.5 or to activate the GPS in "idle" mode?

Best Regards,

Marco

My guess is you need to call RequestPowerState (via P/Invoke) with the device GUID to have the OS change the power status from D0 to D4 and back.  No idea what the GUID would be for the device though.

Hello Ctacke,  You are right.

i did it with

 .....

Const POWER_STATE_OFF As Integer = &H20000

Const POWER_STATE_IDLE As Integer = &H100000

<DllImport("Coredll.dll")> _

Private Shared Function SetSystemPowerState(ByVal psState As String, ByVal StateFlags As Integer, ByVal Options As Integer) As Integer

End Function

Declare Sub SHIdleTimerReset Lib "Aygshell.dll" Alias "SHIdleTimerReset" ()