examples/QtQuick/bluetoothex/devicediscoverer.cpp

/*
 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 *    
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    
 *  * Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  * Neither the name of Nokia Corporation nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *    
 *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 *    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 *    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 *    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 *    OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *    
 *    Description:  
 */

// INCLUDE FILES
#include "devicediscoverer.h"

_LIT(KBTLinkManagerTxt,"BTLinkManager");

// Call Static function NewL to create an instance of this class.
CDeviceDiscoverer* CDeviceDiscoverer::NewL(RSocketServ& aSocketServ,
                                           MDeviceDiscoObserver& aObserver)
    {
    CDeviceDiscoverer* self = CDeviceDiscoverer::NewLC(aSocketServ, aObserver);
    CleanupStack::Pop(self);
    return self;
    }

// Call Static function NewLC to create an instance of this class.
CDeviceDiscoverer* CDeviceDiscoverer::NewLC(RSocketServ& aSocketServ,
                                            MDeviceDiscoObserver& aObserver)
    {
    CDeviceDiscoverer* self = new (ELeave) CDeviceDiscoverer(aSocketServ,
        aObserver);
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }

// Two phase contructor.
void CDeviceDiscoverer::ConstructL()
    {
    }

// constructor
CDeviceDiscoverer::CDeviceDiscoverer(RSocketServ& aSocketServ,
                                     MDeviceDiscoObserver& aObserver):
    CActive(CActive::EPriorityStandard),
    iSocketServ(aSocketServ),
    iObserver(aObserver)
    {
    CActiveScheduler::Add(this);
    }

// Destructor
CDeviceDiscoverer::~CDeviceDiscoverer()
    { 
    // cancel active object
    Cancel();
    iResolver.Close();
    }

void CDeviceDiscoverer::DiscoverDevicesL(TDeviceDataList* aDevDataList)
    {
    if (!IsActive())
        {
        // initialize host resolver
        // load protocol for discovery
        TProtocolDesc pdesc;
        User::LeaveIfError(iSocketServ.FindProtocol(KBTLinkManagerTxt(), pdesc));

        iResolver.Close();
        User::LeaveIfError(iResolver.Open(iSocketServ, pdesc.iAddrFamily, pdesc.iProtocol));
        
        // wipe existing device data list, start fresh
        iDevDataList=aDevDataList;
        iDevDataList->Reset();

        iAddr.SetIAC( KGIAC );

        iAddr.SetAction(KHostResInquiry|KHostResName|KHostResIgnoreCache);
        iResolver.GetByAddress(iAddr, iEntry, iStatus);
        SetActive();
        }
    else
        {
        User::Leave(KErrNotReady);
        }
    }

// RunL
void CDeviceDiscoverer::RunL()
    {
    // RHostResolver.GetByAddress(..) has completed, process results
    if ( iStatus!=KErrNone )
        {
        // all devices (if any) done, notify 
        if (iDevDataList->Count()>0)
            {
            iObserver.HandleDeviceDiscoveryComplete(KErrNone);
            }
        else
            {
            iObserver.HandleDeviceDiscoveryComplete(KErrNotFound);
            }
        }
    else 
        {
        // new device data entry
        TDeviceData *devData = new (ELeave) TDeviceData();
        devData->iDeviceName = iEntry().iName;
        devData->iDeviceAddr = 
            static_cast<TBTSockAddr>(iEntry().iAddr).BTAddr();
        devData->iDeviceServicePort = 0;
        // add device data entry
        iDevDataList->Append(devData);
        
        iObserver.DeviceDiscovered(*devData);

        // get next discovered device
        iResolver.Next(iEntry, iStatus);
        // wait for resolver to complete
        SetActive();
        }
    }

// Cancel the current request.
void CDeviceDiscoverer::DoCancel()
    {
    iResolver.Cancel();
    }


// Returns true if any devices were discovered
TBool CDeviceDiscoverer::HasDevices()
    {
    TBool exists = EFalse;
    
    if (iDevDataList)
        {
        if (iDevDataList->Count() > 0)
            {
            exists = ETrue;
            }
        }
    return exists;
    }

// Stop discovery
void CDeviceDiscoverer::StopDiscovery()
    {
    Cancel();

    if (HasDevices())
        {
        iObserver.HandleDeviceDiscoveryComplete(KErrNone);
        }
    else
        {
        iObserver.HandleDeviceDiscoveryComplete(KErrNotFound);
        }
    }

---