Check whether keyboard backlight is on

Article Metadata

---

Tested with

Devices(s): N78

---

Compatibility

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

---

Platform Security

Capabilities: )

---

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.