Prevent light-off/key-lock/suspend/standby

[cyberco]

My application has to upload quite some data, which takes a long time.
In the meantime the device goes into 'suspend' mode (at least the light
turns off and the keypad gets locked). The side-effect is that the
network connection is broken as well (at least the WiFi connection).
How to prevent 'suspend' can be found here:

http://msdn2.microsoft.com/en-us/library/z4k4wb9k(VS.80).aspx

But that didn't solve my problem. How can I prevent the screen from
going black and the keys from becoming locked?

 

[Paul G. Tobey [eMVP]]

Hang on. You did the idle timer reset and it still locked up and
disconnected you? I don't think so.

Paul T.

 

[Guest]

You must call SystemIdleTimerReset periodically, not just once. The period
must also be smaller than the system timeout is set for.

 

[Hilton]

Looks like there is a bug in that code. The "== 0" should be "> 0" in
EnableSuspend.

Hilton

 

[cyberco]

That is indeed a bug.
I found a better example of using the native SystemIdleTimerReset
method here:

http://www.pinvoke.net/default.aspx/coredll/SystemIdleTimerReset.html

It uses a Timer object that you can dispose at any time.