Qt 蓝牙主动读取 示例代码

Qt 提供了一套强大的蓝牙库，用于处理蓝牙功能。以下是使用Qt5的一个简单示例代码片段，展示了如何在QBluetoothDeviceDiscoveryAgent的帮助下，实现蓝牙设备的主动扫描并获取发现的设备列表：

#include <QObject>
#include <QBluetooth>
#include <QBluetoothDeviceInfo>

class BluetoothScanner : public QObject
{
    Q_OBJECT

public:
    explicit BluetoothScanner(QObject *parent = nullptr)
        : QObject(parent), discoveryAgent(new QBluetoothDeviceDiscoveryAgent(this))
    {
        // 设置代理并开始扫描
        connect(discoveryAgent, &QBluetoothDeviceDiscoveryAgent::discoveredDevices, this, &BluetoothScanner::onDiscoveredDevices);
        startScanning();
    }

    ~BluetoothScanner()
    {
        stopScanning();
    }

private slots:
    void onDiscoveredDevices(const QSet<QBluetoothDeviceInfo>& devices)
    {
        foreach (const QBluetoothDeviceInfo &device, devices) {
            qDebug() << "Found device: " << device.name() << ", Address: " << device.address().toString();
        }
    }

    void startScanning()
    {
        if (!discoveryAgent->isScanning()) {
            discoveryAgent->start();
        }
    }

    void stopScanning()
    {
        if (discoveryAgent->isScanning()) {
            discoveryAgent->stop();
        }
    }

signals:
    void scanningFinished();

private:
    QBluetoothDeviceDiscoveryAgent* discoveryAgent;
};

// 使用示例
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    BluetoothScanner scanner;
    scanner.scanningFinished.connect([]{ qDebug() << "Scanning finished"; });

    return app.exec();
}

在这个例子中，`BluetoothScanner` 类初始化了一个 `QBluetoothDeviceDiscoveryAgent` 实例，并连接到它的 `discoveredDevices` 信号，以便每当有新的蓝牙设备被发现时，会显示设备名称和地址。通过调用 `startScanning()` 开始扫描，`stopScanning()` 则停止扫描。