Does anyone know of any way of detecting whether a device has mains
power or not? I can see power state changes, but can't tell from them
whether the device is connected to a decent power supply.

(We'd like our app to keep trying to download updates if it's on mains
power, but not otherwise.)

--
Jon Skeet - <(E-Mail Removed)>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

P/Invoke GetSystemPowerStateEx and check the value of the ACLineStatus of
the returned SYSTEM_POWER_STATUS_EX structure.

A value of 1 indicates that an AC supply is the power source. Zero indicates
battery is the power source.

Alternatively, check out GetSystemPowerStateEx in OpenNETCF.Win32.Core
(http://opennetcf.org/SourceBrowse/vi.../Win32/Core.cs
go to Line 1627)

HTH
Neil

"Jon Skeet [C# MVP]" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Does anyone know of any way of detecting whether a device has mains
> power or not? I can see power state changes, but can't tell from them
> whether the device is connected to a decent power supply.
>
> (We'd like our app to keep trying to download updates if it's on mains
> power, but not otherwise.)
>
> --
> Jon Skeet - <(E-Mail Removed)>
> http://www.pobox.com/~skeet
> If replying to the group, please do not mail me too

Neil Cowburn <(E-Mail Removed)> wrote:
> P/Invoke GetSystemPowerStateEx and check the value of the ACLineStatus of
> the returned SYSTEM_POWER_STATUS_EX structure.
>
> A value of 1 indicates that an AC supply is the power source. Zero indicates
> battery is the power source.
>
> Alternatively, check out GetSystemPowerStateEx in OpenNETCF.Win32.Core
> (http://opennetcf.org/SourceBrowse/vi...NETCF/InetPub/
> wwwroot/Source/OpenNETCF/Win32/Core.cs
> go to Line 1627)

Aha - many thanks. Not sure why I didn't see that before. Even better,
I've just discovered the BatteryFlag enumeration too, so we can be even
more discriminating

--
Jon Skeet - <(E-Mail Removed)>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

You have to be conservative about using that. Not all devices have detailed
battery-left information available. Don't forget to handle the
BatteryUnknown case...

Paul T.

"Jon Skeet [C# MVP]" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Neil Cowburn <(E-Mail Removed)> wrote:
>> P/Invoke GetSystemPowerStateEx and check the value of the ACLineStatus of
>> the returned SYSTEM_POWER_STATUS_EX structure.
>>
>> A value of 1 indicates that an AC supply is the power source. Zero
>> indicates
>> battery is the power source.
>>
>> Alternatively, check out GetSystemPowerStateEx in OpenNETCF.Win32.Core
>> (http://opennetcf.org/SourceBrowse/vi...NETCF/InetPub/
>> wwwroot/Source/OpenNETCF/Win32/Core.cs
>> go to Line 1627)
>
> Aha - many thanks. Not sure why I didn't see that before. Even better,
> I've just discovered the BatteryFlag enumeration too, so we can be even
> more discriminating
>
> --
> Jon Skeet - <(E-Mail Removed)>
> http://www.pobox.com/~skeet
> If replying to the group, please do not mail me too