QT蓝牙开发
1.要使用qt蓝牙模块, 项目的 .pro要声明使用
2.有了lambda函数后，不用再一个个声明和创建具名槽函数的感觉挺好，就是代码成一坨了
3.虽然说是低功耗蓝牙，但还是要记得用完后断开和外设店连接，之前忘记断开，一晚上一个纽扣电池的点就被耗光了
4.GATT Profile 简介
- 搜寻附近全部的蓝牙设备
- 根据搜寻出的蓝牙设备信息，筛选出要连接的蓝牙设备进行连接
- 建立连接后，去获取该蓝牙设备等services列表，根据约定好的服务uuid筛选出自己需要的服务
- 发现对应的服务后，根据约定好的服务下characteristic特性id,创建特征对象，并监听特征对象内容的变化
- 向客户端特征配置对象写入特征生效消息，开始接收外围蓝牙设备。
bluedevice.h:
#ifndef BLUEDEVICE_H #define BLUEDEVICE_H #include <QObject> #include<QBluetoothDeviceDiscoveryAgent> #include<QBluetoothDeviceInfo> #include<QBluetoothUuid> #include<QBluetoothServiceInfo> #include<QLowEnergyController> #include<QLowEnergyService> #include<QLowEnergyDescriptor> class BlueDevice: public QObject{ Q_OBJECT public: BlueDevice(); QString getAddress(QBluetoothDeviceInfo device) const; private: QList<QBluetoothDeviceInfo> device_list; //存放搜索到到蓝牙设备列表 QBluetoothDeviceDiscoveryAgent *m_deviceDiscoveryAgent; //设备搜索对象 QLowEnergyController *m_controler; //单个蓝牙设备控制器 QLowEnergyService *m_service; //服务对象实例 }; #endif // BLUEDEVICE_H
bluedevice.cpp:
#include "bluedevice.h" #include <QDebug> #include<QTimer> BlueDevice::BlueDevice() { qDebug() << "enter bludedevice constructor...."; m_deviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(this); m_deviceDiscoveryAgent->setLowEnergyDiscoveryTimeout(5000); //每次发现新设备时触发 connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this ,[this]() { qDebug() << "find a new bluebooth device"; }); //蓝牙设备搜索完成后，筛选出目标设备进行连接，并进行相关信号与槽函数的绑定 connect(m_deviceDiscoveryAgent,&QBluetoothDeviceDiscoveryAgent::finished, this, [this]() { device_list = this->m_deviceDiscoveryAgent->discoveredDevices(); //遍历显示设备详情 QList<QBluetoothDeviceInfo>::iterator it; for(it=device_list.begin(); it != device_list.end(); it++) { // 外围蓝牙设备对象 QBluetoothDeviceInfo tmp_device = *it; QString device_name = tmp_device.name(); //qDebug() <<"device name:::" << device_name; //qDebug() << "device address:::" << this->getAddress(tmp_device); //打印搜索出来的全部低功耗蓝牙 if (tmp_device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) { qDebug() << " low Energy device ...."; qDebug() <<"22222device name:::" << device_name; } //正则匹配目标设备， QString pattern_str = "^Eric.*"; //qt中正则匹配任意个字符，需要使用.*而不是* QRegExp rx(pattern_str); if(!rx.exactMatch(device_name)) { continue; } qDebug() <<"device name:::" << device_name; qDebug() << "device address:::" << this->getAddress(tmp_device); // 创建蓝牙设备控制器对象 m_controler = new QLowEnergyController(tmp_device, this); // 监听目标设备连接成功消息，连接成功后，搜索目标设备等服务列表 connect(m_controler, &QLowEnergyController::connected, this, [this](){ qDebug() << "m_controler connected ......"; //必须要在连接建立后 执行开始寻找service的函数 //之前调试，就是因为没有在设备连接后主动请求获取服务列表信息，后续监听便没有触发 m_controler->discoverServices(); }); // 监听发现服务消息，如果服务的uuid 为约定好的要使用服务类型，则进行后续处理 connect(m_controler,&QLowEnergyController::serviceDiscovered, this, [this](QBluetoothUuid serviceUuid) { if(serviceUuid == QBluetoothUuid( quint16(0xffd0))) { //我们用的服务类型是0xffd0对应的uuid //发现匹配的服务后，使用控制器对象创建服务对象 m_service = m_controler->createServiceObject(serviceUuid,this); if(m_service) { // 服务对象创建成功后，坚挺服务状态变化，如果状态变成已发现，则进行后续服务下特征对象获取 connect(m_service,&QLowEnergyService::stateChanged, this, [this]() { qDebug() << "service state change" << m_service->state() << ",||||||"; //发现服务, 建立characteristic对象实例 if(m_service->state() == QLowEnergyService::ServiceDiscovered) { QLowEnergyCharacteristic hrChar = m_service->characteristic(QBluetoothUuid(quint16(0xfff6))); if(!hrChar.isValid()) { qDebug() << "characteristic fff6 error:::"; } // 设置特征对象可用 //enable the chracteristic notification by write 0x01 to client characteristic configuration QLowEnergyDescriptor m_notificationDesc = hrChar.descriptor(QBluetoothUuid::ClientCharacteristicConfiguration); if (m_notificationDesc.isValid()) { if(hrChar.properties() & QLowEnergyCharacteristic::Notify) { qDebug() << ""; } m_service->writeDescriptor(m_notificationDesc, QByteArray::fromHex("0100")); } } }); // 通过监听特征对象的变化，不断获得鞋垫压力数据。 connect(m_service,&QLowEnergyService::characteristicChanged, this, [this](QLowEnergyCharacteristic c,QByteArray value) { qDebug() << "characteristicChanged state change::" <<c.uuid()<< ",||||||"; qDebug() << "value length::" << value.length(); qDebug() << "value length::" << value; QByteArray sub_1 = value.mid(0,2); QByteArray sub_2 = value.mid(2,2); QByteArray sub_3 = value.mid(4,2); bool ok; // num 1,2,3 分别对应三个压力感应点的压力值 int num_1 = QString(sub_1.toHex()).toInt(&ok,16); qDebug() << "num_1:::" << num_1; int num_2 = QString(sub_2.toHex()).toInt(&ok,16); qDebug() << "num_1:::" << num_2; int num_3 = QString(sub_3.toHex()).toInt(&ok,16); qDebug() << "num_1:::" << num_3; } ); // 触发服务详情发现函数 ，不要忘记调用 m_service->discoverDetails(); } } }); connect(m_controler,&QLowEnergyController::discoveryFinished, this, [this]() { qDebug() << "finish service discovery"; }); //连接外围设备 m_controler->connectToDevice(); //QTimer *timer = new QTimer(this); //connect(timer, &QTimer::timeout, this, [this](){ qDebug() <<"state:::" << this->m_controler->state();}); //timer->start(1000); } }); // 开始外围设备搜索 m_deviceDiscoveryAgent->start(); } // mac和其他系统上address获取有少许差异，参见官方文档 QString BlueDevice::getAddress(QBluetoothDeviceInfo device) const { #ifdef Q_OS_MAC // On OS X and iOS we do not have addresses, // only unique UUIDs generated by Core Bluetooth. return device.deviceUuid().toString(); #else return device.address().toString(); #endif } //void BlueDevice::getNewService(QBluetoothServiceInfo info) { // qDebug() << "ppppp uuuuuuuuuu"; //}
