Qt 连接多个蓝牙通信 示例代码

在Qt中连接多个蓝牙设备并进行通信，你可以使用QBluetooth API。以下是一个简单的示例代码，展示如何扫描周围可用的蓝牙设备，并选择其中一个进行连接：

#include <QObject>
#include <QBluetooth>
#include <QBluetoothDeviceDiscoveryAgent>
#include <QBluetoothSocket>

class BluetoothManager : public QObject
{
    Q_OBJECT

public:
    explicit BluetoothManager(QObject *parent = nullptr)
        : QObject(parent), agent(new QBluetoothDeviceDiscoveryAgent(this))
    {
        connect(agent, &QBluetoothDeviceDiscoveryAgent::newDevicesAvailable,
                this, &BluetoothManager::onNewDevices);
    }

private slots:
    void onNewDevices(const QList<QBluetoothDeviceInfo> &devices)
    {
        foreach (const QBluetoothDeviceInfo &device, devices) {
            if (!device.isPaired()) { // 只考虑未配对的设备
                qDebug() << "Found device: " << device.name();
                connectToDevice(device);
            }
        }
    }

    void connectToDevice(const QBluetoothDeviceInfo &deviceInfo)
    {
        const QString address = deviceInfo.address().toString();

        QBluetoothDevice *device = new QBluetoothDevice(QBluetoothAddress(address));
        connect(device, &QBluetoothDevice::disconnected, this, &BluetoothManager::onDisconnected);

        QBluetoothSocket *socket = new QBluetoothSocket(device);
        socket->setSocketType(QBluetoothSocket::ServerSocket); // 设置为服务器端
        connect(socket, &QBluetoothSocket::readyRead, this, &BluetoothManager::handleData);

        if (socket->connectToHost(device)) {
            qDebug() << "Connected to device: " << deviceInfo.name();
            handleConnection(socket);
        } else {
            qWarning() << "Failed to connect to device: " << deviceInfo.name();
            delete device;
            delete socket;
        }
    }

private:
    QBluetoothDeviceDiscoveryAgent *agent; // 蓝牙设备发现代理
    QBluetoothSocket *currentSocket; // 当前连接的socket

    void handleData()
    {
        // 在这里处理接收的数据...
    }

    void handleConnection(QBluetoothSocket *socket)
    {
        // 在这里初始化和管理蓝牙通信...
    }

    void onDisconnected()
    {
        qDebug() << "Disconnected from device";
        currentSocket->deleteLater();
        currentSocket = nullptr;
    }
};

这个示例创建了一个`BluetoothManager`类，用于管理和控制蓝牙通信过程。注意这只是一个基础版本，实际应用中你可能需要添加错误处理、数据包解析和发送等功能。