Check whether keyboard backlight is on

Comments

23 Sep
2009

Article Review by fasttrack (20090923)

Article shows How to check whether keyboard backlight is on…. In major application without any interrupt we have to keep backlight on. For that we have to continue check. Putting the image of the mobile which run this application may improve this article. And linking this article with “How_to_keep_backlight_on” may also be good improvement.

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Article Metadata

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Tested with

Devices(s): N78

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Compatibility

Platform(s): S60 3rd,3rd FP1,3rd Fp2

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Platform Security

Capabilities: )

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Article

Keywords: keywords=HAL::Get(),User::ResetInactivityTime()

Created: lming (21 Nov 2008)

Last edited: hamishwillee (08 Feb 2012)

Overview

This snippet demonstrates how to check whether the keyboard backlight is off and how to turn it on. This snippet can be self-signed.

Source file

//necessary library
LIBRARY	        HAL.LIB
LIBRARY		euser.lib

//necessary header file
#include <HAL.h>
#include <hal_data.h>
#include <e32std.h>
 
TBool keyboardBacklightState;
//retrieve EKeyboardBacklightStatevalue
HAL::Get( HALData::EKeyboardBacklightState, keyboardBacklightState);    
if(keyboardBacklightState)
   {
   //keyboard backlight is ON now.
   ....... 
   }
else
   {
   //keyboard backlight is Off now.
   //ResetInactivityTime will reset all user inactivity timers and backlight 
   //will be turn on
   User::ResetInactivityTime()
   }

Postconditions

The keyboard backlight will be turned on. Notice that User::ResetInactivityTime also makes the screen backlight to be turned on.