Checking the Bluetooth power state in 3rd Ed

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Article

Created: vin2ktalks (22 May 2007)

Last edited: hamishwillee (20 Jul 2012)

Reviewer Approved   

Headers Required:

#include <centralrepository.h> // for CRepository
#include <BTServerSDKCRKeys.h> // for KCRUidBluetoothPowerState, KBTPowerState
#include <BtnotifierAPI.h> // for KPowerModeSettingNotifierUid

Library Required:

LIBRARY centralrepository.lib  //CRepository

Source File:

//-----------------------------------------------------------------------------------
//CBTEngine::CheckBluetoothPowerStateL()
//This will check the Bluetooth power state and if switched off 
//then ask to switch it on.
//------------------------------------------------------------------------------------
 
TBool CBTEngine::CheckBluetoothPowerStateL()
    {
    if(BluetoothPowerStateL())
        {
        return ETrue;
        }
    else
        {
        return TurnBluetoothOnL();
        }
    }
 
// ----------------------------------------------------------------------------
// CBTEngine::BluetoothPowerStateL()
// Get the Bluetooth power state of the device.
// ----------------------------------------------------------------------------
//
TBool CBTEngine::BluetoothPowerStateL()
    {
    CRepository* crep = CRepository::NewLC(KCRUidBluetoothPowerState);
    TInt value = 0;
    User::LeaveIfError(crep->Get(KBTPowerState, value));
    CleanupStack::PopAndDestroy(crep);
 
    return !(value == 0);
    }
 
// ----------------------------------------------------------------------------
// CBTEngine::TurnBluetoothOnL()
// Uses the Notifier API to ask the user to turn on Bluetooth
// if it's not on already.
// ----------------------------------------------------------------------------
//
TBool CBTEngine::TurnBluetoothOnL()
    {  
    RNotifier notifier;
    User::LeaveIfError( notifier.Connect() );
    TPckgBuf<TBool> dummy(ETrue);
    TPckgBuf<TBool> reply(EFalse);
    TRequestStatus status;
    notifier.StartNotifierAndGetResponse(status, 
        KPowerModeSettingNotifierUid, dummy, reply);
    User::WaitForRequest(status);
    notifier.CancelNotifier(KPowerModeSettingNotifierUid);
    notifier.Close();
 
    return reply();
    }

Related Links

• Check Bluetooth power on/off in Symbian 2nd edition phones

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Note: The code has been taken from BTFileSend, an open source project in SourceForge.net.