在Qt中掃描藍牙設備

Question

這是我的代碼：我有一個名為bluetoothCommunication的類，在其中需要放置一些用於通過藍牙交換數據的方法。

 bluetoothCommunication::bluetoothCommunication()
{
    QBluetoothLocalDevice localDevice;
    QString localDeviceName;
    //Check if Bluetooth is available on this device
    if(localDevice.isValid()){
        //Turn Bluetooth on
        localDevice.powerOn();
        //Read local device name
        localDeviceName = localDevice.name();
        //Make it visible to others
        localDevice.setHostMode(QBluetoothLocalDevice::HostDiscoverable);
        //Get connected devices
        QList<QBluetoothAddress> remotes;
        remotes = localDevice.connectedDevices();
    }
}

void bluetoothCommunication::startDeviceDiscovery()
    {
    qDebug() << "Bluetooth discovery started";

    //Create a discovery agent and connect to its signals
    QBluetoothDeviceDiscoveryAgent* discoveryAgent = new QBluetoothDeviceDiscoveryAgent();
    QObject::connect(discoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo*)), &this, SLOT(deviceDiscovered(QBluetoothDeviceInfo*))); //HERE I HAVE AN ERROR //DON'T KNOW WHERE AND WHY
    //Start a discovery
    discoveryAgent -> start();
}

我試圖修改qt文檔（以下內容）中的官方示例，如果我復制並粘貼它，則會在編譯期間出現錯誤：

    void MyClass::startDeviceDiscovery()
{
// Create a discovery agent and connect to its signals
QBluetoothDeviceDiscoveryAgent *discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
connect(discoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),
        this, SLOT(deviceDiscovered(QBluetoothDeviceInfo)));

// Start a discovery
discoveryAgent->start();

//...
}

但是，我對其進行修復的嘗試仍然無法正常工作。 帶有錯誤信息：

在成員函數void bluetoothCommunication::startDeviceDiscovery() ：左值必須為一元&操作數

Answer 1

因此，按照示例文檔，我設法生成了代碼編譯的一個小示例。

開始說明：

• 您需要QtCreator 5.2或更高版本才能編譯QBluetooth庫。
• 在.pro文件中添加Qt + = bluetooth
• 使用Qt文檔提供的示例
• 在頭文件中，包括所有庫並添加方法定義。

bluetoothSample.pro

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets bluetooth

TARGET = bluetoothSample
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 

SOURCES += main.cpp\
    mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

mainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QBluetoothDeviceDiscoveryAgent>
#include <QBluetoothDeviceInfo>

namespace Ui {
  class MainWindow;
}

class MainWindow : public QMainWindow
{
  Q_OBJECT

private:
  Ui::MainWindow *ui;
  void startDeviceDiscovery();

private slots:
  void deviceDiscovered(const QBluetoothDeviceInfo &device);
};

#endif // MAINWINDOW_H

mainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QDebug>

void MainWindow::startDeviceDiscovery()
{
  // Create a discovery agent and connect to its signals
  QBluetoothDeviceDiscoveryAgent *discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
  connect(discoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),
        this, SLOT(deviceDiscovered(QBluetoothDeviceInfo)));

  // Start a discovery
  discoveryAgent->start();

  //...
}

// In your local slot, read information about the found devices
void MainWindow::deviceDiscovered(const QBluetoothDeviceInfo &device)
{
  qDebug() << "Found new device:" << device.name() << '(' << device.address().toString() << ')';
}

Answer 2

我有標准示例的掃描問題。
我解決了問題，刪除uuid filtr：

// m_discoveryAgent-> setUuidFilter（uuid）; 找到設備。