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<h1 class="title">device.cpp Example File</h1>
<span class="subtitle">lowenergyscanner/device.cpp</span>
<!-- $$$lowenergyscanner/device.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/***************************************************************************
**
** Copyright (C) 2013 BlackBerry Limited. All rights reserved.
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtBluetooth module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "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 The Qt Company Ltd 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
** OWNER 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "device.h"</span>
<span class="preprocessor">#include <qbluetoothaddress.h></span>
<span class="preprocessor">#include <qbluetoothdevicediscoveryagent.h></span>
<span class="preprocessor">#include <qbluetoothlocaldevice.h></span>
<span class="preprocessor">#include <qbluetoothdeviceinfo.h></span>
<span class="preprocessor">#include <qbluetoothservicediscoveryagent.h></span>
<span class="preprocessor">#include <QDebug></span>
<span class="preprocessor">#include <QList></span>
<span class="preprocessor">#include <QTimer></span>
Device<span class="operator">::</span>Device():
connected(<span class="keyword">false</span>)<span class="operator">,</span> controller(<span class="number">0</span>)<span class="operator">,</span> m_deviceScanState(<span class="keyword">false</span>)<span class="operator">,</span> randomAddress(<span class="keyword">false</span>)
{
discoveryAgent <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QBluetoothDeviceDiscoveryAgent</span>();
connect(discoveryAgent<span class="operator">,</span> SIGNAL(deviceDiscovered(<span class="keyword">const</span> <span class="type">QBluetoothDeviceInfo</span><span class="operator">&</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(addDevice(<span class="keyword">const</span> <span class="type">QBluetoothDeviceInfo</span><span class="operator">&</span>)));
connect(discoveryAgent<span class="operator">,</span> SIGNAL(error(<span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>Error))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(deviceScanError(<span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>Error)));
connect(discoveryAgent<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(deviceScanFinished()));
setUpdate(<span class="string">"Search"</span>);
}
Device<span class="operator">::</span><span class="operator">~</span>Device()
{
<span class="keyword">delete</span> discoveryAgent;
<span class="keyword">delete</span> controller;
<a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(devices);
<a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_services);
<a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_characteristics);
devices<span class="operator">.</span>clear();
m_services<span class="operator">.</span>clear();
m_characteristics<span class="operator">.</span>clear();
}
<span class="type">void</span> Device<span class="operator">::</span>startDeviceDiscovery()
{
<a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(devices);
devices<span class="operator">.</span>clear();
<span class="keyword">emit</span> devicesUpdated();
setUpdate(<span class="string">"Scanning for devices ..."</span>);
discoveryAgent<span class="operator">-</span><span class="operator">></span>start();
<span class="keyword">if</span> (discoveryAgent<span class="operator">-</span><span class="operator">></span>isActive()) {
m_deviceScanState <span class="operator">=</span> <span class="keyword">true</span>;
Q_EMIT stateChanged();
}
}
<span class="type">void</span> Device<span class="operator">::</span>addDevice(<span class="keyword">const</span> <span class="type">QBluetoothDeviceInfo</span> <span class="operator">&</span>info)
{
<span class="keyword">if</span> (info<span class="operator">.</span>coreConfigurations() <span class="operator">&</span> <span class="type">QBluetoothDeviceInfo</span><span class="operator">::</span>LowEnergyCoreConfiguration) {
DeviceInfo <span class="operator">*</span>d <span class="operator">=</span> <span class="keyword">new</span> DeviceInfo(info);
devices<span class="operator">.</span>append(d);
setUpdate(<span class="string">"Last device added: "</span> <span class="operator">+</span> d<span class="operator">-</span><span class="operator">></span>getName());
}
}
<span class="type">void</span> Device<span class="operator">::</span>deviceScanFinished()
{
<span class="keyword">emit</span> devicesUpdated();
m_deviceScanState <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">emit</span> stateChanged();
<span class="keyword">if</span> (devices<span class="operator">.</span>isEmpty())
setUpdate(<span class="string">"No Low Energy devices found..."</span>);
<span class="keyword">else</span>
setUpdate(<span class="string">"Done! Scan Again!"</span>);
}
<span class="type">QVariant</span> Device<span class="operator">::</span>getDevices()
{
<span class="keyword">return</span> <span class="type">QVariant</span><span class="operator">::</span>fromValue(devices);
}
<span class="type">QVariant</span> Device<span class="operator">::</span>getServices()
{
<span class="keyword">return</span> <span class="type">QVariant</span><span class="operator">::</span>fromValue(m_services);
}
<span class="type">QVariant</span> Device<span class="operator">::</span>getCharacteristics()
{
<span class="keyword">return</span> <span class="type">QVariant</span><span class="operator">::</span>fromValue(m_characteristics);
}
<span class="type">QString</span> Device<span class="operator">::</span>getUpdate()
{
<span class="keyword">return</span> m_message;
}
<span class="type">void</span> Device<span class="operator">::</span>scanServices(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>address)
{
<span class="comment">// We need the current device for service discovery.</span>
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> devices<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>) {
<span class="keyword">if</span> (((DeviceInfo<span class="operator">*</span>)devices<span class="operator">.</span>at(i))<span class="operator">-</span><span class="operator">></span>getAddress() <span class="operator">=</span><span class="operator">=</span> address )
currentDevice<span class="operator">.</span>setDevice(((DeviceInfo<span class="operator">*</span>)devices<span class="operator">.</span>at(i))<span class="operator">-</span><span class="operator">></span>getDevice());
}
<span class="keyword">if</span> (<span class="operator">!</span>currentDevice<span class="operator">.</span>getDevice()<span class="operator">.</span>isValid()) {
<a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Not a valid device"</span>;
<span class="keyword">return</span>;
}
<a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_characteristics);
m_characteristics<span class="operator">.</span>clear();
<span class="keyword">emit</span> characteristicsUpdated();
<a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_services);
m_services<span class="operator">.</span>clear();
<span class="keyword">emit</span> servicesUpdated();
setUpdate(<span class="string">"Back\n(Connecting to device...)"</span>);
<span class="keyword">if</span> (controller <span class="operator">&</span><span class="operator">&</span> m_previousAddress <span class="operator">!</span><span class="operator">=</span> currentDevice<span class="operator">.</span>getAddress()) {
controller<span class="operator">-</span><span class="operator">></span>disconnectFromDevice();
<span class="keyword">delete</span> controller;
controller <span class="operator">=</span> <span class="number">0</span>;
}
<span class="keyword">if</span> (<span class="operator">!</span>controller) {
<span class="comment">// Connecting signals and slots for connecting to LE services.</span>
controller <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLowEnergyController</span>(currentDevice<span class="operator">.</span>getDevice());
connect(controller<span class="operator">,</span> SIGNAL(connected())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(deviceConnected()));
connect(controller<span class="operator">,</span> SIGNAL(error(<span class="type">QLowEnergyController</span><span class="operator">::</span>Error))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(errorReceived(<span class="type">QLowEnergyController</span><span class="operator">::</span>Error)));
connect(controller<span class="operator">,</span> SIGNAL(disconnected())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(deviceDisconnected()));
connect(controller<span class="operator">,</span> SIGNAL(serviceDiscovered(<span class="type">QBluetoothUuid</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(addLowEnergyService(<span class="type">QBluetoothUuid</span>)));
connect(controller<span class="operator">,</span> SIGNAL(discoveryFinished())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(serviceScanDone()));
}
<span class="keyword">if</span> (isRandomAddress())
controller<span class="operator">-</span><span class="operator">></span>setRemoteAddressType(<span class="type">QLowEnergyController</span><span class="operator">::</span>RandomAddress);
<span class="keyword">else</span>
controller<span class="operator">-</span><span class="operator">></span>setRemoteAddressType(<span class="type">QLowEnergyController</span><span class="operator">::</span>PublicAddress);
controller<span class="operator">-</span><span class="operator">></span>connectToDevice();
m_previousAddress <span class="operator">=</span> currentDevice<span class="operator">.</span>getAddress();
}
<span class="type">void</span> Device<span class="operator">::</span>addLowEnergyService(<span class="keyword">const</span> <span class="type">QBluetoothUuid</span> <span class="operator">&</span>serviceUuid)
{
<span class="type">QLowEnergyService</span> <span class="operator">*</span>service <span class="operator">=</span> controller<span class="operator">-</span><span class="operator">></span>createServiceObject(serviceUuid);
<span class="keyword">if</span> (<span class="operator">!</span>service) {
<a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Cannot create service for uuid"</span>;
<span class="keyword">return</span>;
}
ServiceInfo <span class="operator">*</span>serv <span class="operator">=</span> <span class="keyword">new</span> ServiceInfo(service);
m_services<span class="operator">.</span>append(serv);
<span class="keyword">emit</span> servicesUpdated();
}
<span class="type">void</span> Device<span class="operator">::</span>serviceScanDone()
{
setUpdate(<span class="string">"Back\n(Service scan done!)"</span>);
<span class="comment">// force UI in case we didn't find anything</span>
<span class="keyword">if</span> (m_services<span class="operator">.</span>isEmpty())
<span class="keyword">emit</span> servicesUpdated();
}
<span class="type">void</span> Device<span class="operator">::</span>connectToService(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>uuid)
{
<span class="type">QLowEnergyService</span> <span class="operator">*</span>service <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> m_services<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>) {
ServiceInfo <span class="operator">*</span>serviceInfo <span class="operator">=</span> (ServiceInfo<span class="operator">*</span>)m_services<span class="operator">.</span>at(i);
<span class="keyword">if</span> (serviceInfo<span class="operator">-</span><span class="operator">></span>getUuid() <span class="operator">=</span><span class="operator">=</span> uuid) {
service <span class="operator">=</span> serviceInfo<span class="operator">-</span><span class="operator">></span>service();
<span class="keyword">break</span>;
}
}
<span class="keyword">if</span> (<span class="operator">!</span>service)
<span class="keyword">return</span>;
<a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_characteristics);
m_characteristics<span class="operator">.</span>clear();
<span class="keyword">emit</span> characteristicsUpdated();
<span class="keyword">if</span> (service<span class="operator">-</span><span class="operator">></span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type">QLowEnergyService</span><span class="operator">::</span>DiscoveryRequired) {
connect(service<span class="operator">,</span> SIGNAL(stateChanged(<span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceState))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(serviceDetailsDiscovered(<span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceState)));
service<span class="operator">-</span><span class="operator">></span>discoverDetails();
setUpdate(<span class="string">"Back\n(Discovering details...)"</span>);
<span class="keyword">return</span>;
}
<span class="comment">//discovery already done</span>
<span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type">QLowEnergyCharacteristic</span><span class="operator">></span> chars <span class="operator">=</span> service<span class="operator">-</span><span class="operator">></span>characteristics();
foreach (<span class="keyword">const</span> <span class="type">QLowEnergyCharacteristic</span> <span class="operator">&</span>ch<span class="operator">,</span> chars) {
CharacteristicInfo <span class="operator">*</span>cInfo <span class="operator">=</span> <span class="keyword">new</span> CharacteristicInfo(ch);
m_characteristics<span class="operator">.</span>append(cInfo);
}
<span class="type">QTimer</span><span class="operator">::</span>singleShot(<span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(characteristicsUpdated()));
}
<span class="type">void</span> Device<span class="operator">::</span>deviceConnected()
{
setUpdate(<span class="string">"Back\n(Discovering services...)"</span>);
connected <span class="operator">=</span> <span class="keyword">true</span>;
controller<span class="operator">-</span><span class="operator">></span>discoverServices();
}
<span class="type">void</span> Device<span class="operator">::</span>errorReceived(<span class="type">QLowEnergyController</span><span class="operator">::</span>Error <span class="comment">/*error*/</span>)
{
<a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Error: "</span> <span class="operator"><</span><span class="operator"><</span> controller<span class="operator">-</span><span class="operator">></span>errorString();
setUpdate(<span class="type">QString</span>(<span class="string">"Back\n(%1)"</span>)<span class="operator">.</span>arg(controller<span class="operator">-</span><span class="operator">></span>errorString()));
}
<span class="type">void</span> Device<span class="operator">::</span>setUpdate(<span class="type">QString</span> message)
{
m_message <span class="operator">=</span> message;
<span class="keyword">emit</span> updateChanged();
}
<span class="type">void</span> Device<span class="operator">::</span>disconnectFromDevice()
{
<span class="comment">// UI always expects disconnect() signal when calling this signal</span>
<span class="comment">// TODO what is really needed is to extend state() to a multi value</span>
<span class="comment">// and thus allowing UI to keep track of controller progress in addition to</span>
<span class="comment">// device scan progress</span>
<span class="keyword">if</span> (controller<span class="operator">-</span><span class="operator">></span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyController</span><span class="operator">::</span>UnconnectedState)
controller<span class="operator">-</span><span class="operator">></span>disconnectFromDevice();
<span class="keyword">else</span>
deviceDisconnected();
}
<span class="type">void</span> Device<span class="operator">::</span>deviceDisconnected()
{
<a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Disconnect from device"</span>;
<span class="keyword">emit</span> disconnected();
}
<span class="type">void</span> Device<span class="operator">::</span>serviceDetailsDiscovered(<span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceState newState)
{
<span class="keyword">if</span> (newState <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceDiscovered) {
<span class="comment">// do not hang in "Scanning for characteristics" mode forever</span>
<span class="comment">// in case the service discovery failed</span>
<span class="comment">// We have to queue the signal up to give UI time to even enter</span>
<span class="comment">// the above mode</span>
<span class="keyword">if</span> (newState <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyService</span><span class="operator">::</span>DiscoveringServices) {
<span class="type">QMetaObject</span><span class="operator">::</span>invokeMethod(<span class="keyword">this</span><span class="operator">,</span> <span class="string">"characteristicsUpdated"</span><span class="operator">,</span>
<span class="type">Qt</span><span class="operator">::</span>QueuedConnection);
}
<span class="keyword">return</span>;
}
<span class="type">QLowEnergyService</span> <span class="operator">*</span>service <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type">QLowEnergyService</span> <span class="operator">*</span><span class="operator">></span>(sender());
<span class="keyword">if</span> (<span class="operator">!</span>service)
<span class="keyword">return</span>;
<span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type">QLowEnergyCharacteristic</span><span class="operator">></span> chars <span class="operator">=</span> service<span class="operator">-</span><span class="operator">></span>characteristics();
foreach (<span class="keyword">const</span> <span class="type">QLowEnergyCharacteristic</span> <span class="operator">&</span>ch<span class="operator">,</span> chars) {
CharacteristicInfo <span class="operator">*</span>cInfo <span class="operator">=</span> <span class="keyword">new</span> CharacteristicInfo(ch);
m_characteristics<span class="operator">.</span>append(cInfo);
}
<span class="keyword">emit</span> characteristicsUpdated();
}
<span class="type">void</span> Device<span class="operator">::</span>deviceScanError(<span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>Error error)
{
<span class="keyword">if</span> (error <span class="operator">=</span><span class="operator">=</span> <span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>PoweredOffError)
setUpdate(<span class="string">"The Bluetooth adaptor is powered off, power it on before doing discovery."</span>);
<span class="keyword">else</span> <span class="keyword">if</span> (error <span class="operator">=</span><span class="operator">=</span> <span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>InputOutputError)
setUpdate(<span class="string">"Writing or reading from the device resulted in an error."</span>);
<span class="keyword">else</span>
setUpdate(<span class="string">"An unknown error has occurred."</span>);
m_deviceScanState <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">emit</span> devicesUpdated();
<span class="keyword">emit</span> stateChanged();
}
bool Device<span class="operator">::</span>state()
{
<span class="keyword">return</span> m_deviceScanState;
}
bool Device<span class="operator">::</span>hasControllerError() <span class="keyword">const</span>
{
<span class="keyword">if</span> (controller <span class="operator">&</span><span class="operator">&</span> controller<span class="operator">-</span><span class="operator">></span>error() <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyController</span><span class="operator">::</span>NoError)
<span class="keyword">return</span> <span class="keyword">true</span>;
<span class="keyword">return</span> <span class="keyword">false</span>;
}
bool Device<span class="operator">::</span>isRandomAddress() <span class="keyword">const</span>
{
<span class="keyword">return</span> randomAddress;
}
<span class="type">void</span> Device<span class="operator">::</span>setRandomAddress(bool newValue)
{
randomAddress <span class="operator">=</span> newValue;
<span class="keyword">emit</span> randomAddressChanged();
}
</pre>
</div>
<!-- @@@lowenergyscanner/device.cpp -->
</div>
</div>
</div>
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