Checks whether Bluetooth is enabled.

 

Checks whether Bluetooth is enabled. This is a classic method.

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

Library required:(Required link)

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();
}

The following is another method ::

Versions earlier than 3rd: tbool get‑thon () // btonoff
{
// Create and initialise an fig
Rhostresolver hr;
Tint res = false;
Tbool ret; rsocketserv socketserver;
User: leaveiferror (socketserver. Connect ());
Cleanupclosepushl (socketserver); tprotocoldesc pinfo;
// _ Increment (kl2cap, "btlinkmanager ");
User: leaveiferror (socketserver. findprotocol (_ L ("btlinkmanager"), pinfo); Res = HR. Open (socketserver, kbtaddrfamily, pinfo. iprotocol); If (kerrnone! = Res ){
// If not success, this means Bluetooth is not on
Ret = efalse;
} Else
{
Ret = etrue; // Bluetooth is already on
HR. Close ();
} Cleanupstack: popanddestroy (1); return ret;
} Or rshareddataclient SD;
SD. Connect (0 );
SD. Assign (tuid: UID (0x10005952); in 3rd, you can do this: crepository * Cr = crepository: newlc (kcruid1_thpowerstate );
Tint value;
Cr-> get (kbtpowerstate, value );
If (value = ebtpoweron)
Apower = 1;
Cleanupstack: popanddestroy (CR ); Note: You must set the related permissions of 3rd API in IDE. Otherwise, you will get the error code-46, indicating that you are not authorized to call the get function.  Enable Bluetooth1. The rnotifier inotifier header file is displayed in the pop-up dialog box;
Tbtdeviceresponseparamspckg inotifierresult;
Tpckgbuf <tbool> pckg; in CPP: User: leaveiferror (inotifier. Connect ());
Inotifier. startnotifierandgetresponse (istatus,
Kpowermodesettingnotifieruid,
Pckg,
Inotifierresult); istate = eopeningbt;
Setactive (); 2. without confirmation from the user, the bteng In SDK 1.2 is automatically enabled. llib reverse engineering, and then use the cbtmcmsettings class // turn on Bluetooth in case it was offcbtmcmset?settings = cbtmcmset=:: newl (mbtmcmsettingscb *) null );
Settings-> setpowerstatel (etrue, efalse); // On, off is (efalse, efalse) in 3rd, there is also a way to enable Bluetooth theoretically, however, the test was not successful on the real machine due to insufficient permissions. Crepository * Cr = crepository: newlc (kcruid1_thpowerstate );
Tint err = Cr-> set (kbtpowerstate, ebtpoweron); in this case, the value of err on the real machine is-46, indicating that no permission is granted.