TSS000470 - Getting a list of paired Bluetooth devices

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Search for Bluetooth devices in the BT registry can be narrowed down with a TBTRegistrySearch instance.

The following code example uses the TBTRegistrySearch::FindBonded() criterion, which will return only Bluetooth devices that have already been paired with this device. Other criteria include searching by a specific device address, name, or Bluetooth device class. Search can be also be limited to return only trusted (authorized) devices.

Multiple search criteria can be used, in which case they are combined with the AND operator. TBTRegistrySearch::FindAll() will return all devices (unless other criteria are used).

void CBtEngine::GetPairedDevices( CBTDeviceArray& aDeviceArray )
        {
        RBTRegServ regServer;
        RBTRegistry registry;
        User::LeaveIfError( regServer.Connect() );
        CleanupClosePushL( regServer );
        User::LeaveIfError( registry.Open(regServer) );
        CleanupClosePushL( registry );
        TBTRegistrySearch searchPattern;
        searchPattern.FindBonded();
        registry.CreateView( searchPattern, iStatus );
        iState = ECreateView;
        SetActive();
        iSchedulerWait->Start(); // of type CActiveSchedulerWait*
        TInt retVal = iStatus.Int();
        if ( retVal > 0 )
            {
            CBTRegistryResponse* response = 
                CBTRegistryResponse::NewL( registry );
            CleanupStack::PushL( response );
            response->Start( iStatus );            
            iState = EGetResponse;
            SetActive();
            iSchedulerWait->Start();
            retVal = iStatus.Int();
            if ( retVal == KErrNone )
                {
                RBTDeviceArray results = response->Results();
                aDeviceArray.ResetAndDestroy();
                // RBTEngUtil::SortBTDevicesByNameL( results );
           
                TInt count = results.Count();
                for ( TInt i = 0; i < count; i++ )
                    {
                    aDeviceArray.AppendL( results[i]->CopyL() );
                    }
                }
            CleanupStack::PopAndDestroy( response );
            }
        CleanupStack::PopAndDestroy( &registry );
        CleanupStack::PopAndDestroy( &regServer );
        }

CActive::RunL() implementation of CBtEngine class:

       void CBtEngine::RunL()
           {
           switch( iState )
               {
               case ENone:
                   break;
               case ECreateView:
                   iSchedulerWait->AsyncStop();
                   break;
               case EGetResponse:
                   iSchedulerWait->AsyncStop();
                   break;
               default:
                   break;
               }
           }

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