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【蓝牙】Linux Qt4查看已经配对的蓝牙信息

news 2025/7/2 6:58:19

在Linux系统中使用Qt4查看已配对的蓝牙设备信息，可以基于DBus与BlueZ（Linux下的蓝牙协议栈）进行交互。以下是一个实现方案：

1. 引入必要的库和头文件

确保项目中包含DBus相关的头文件，并链接QtDBus模块：

cpp

#include <QDBusInterface>
#include <QDBusReply>
#include <QDBusObjectPath>
#include <QVariantMap>

2. 定义DBus常量

用于连接BlueZ服务的DBus接口、服务名和路径：

cpp

#define BLUEZ_DBUS_SERVICE  "org.bluez"
#define BLUEZ_DBUS_PATH "/org/bluez/hci0"
#define BLUEZ_DBUS_IF "org.bluez.Adapter1"

3. 获取已管理对象（Managed Objects）

通过调用org.freedesktop.DBus.ObjectManager接口的GetManagedObjects方法，可以获取所有蓝牙设备的信息。

cpp

QVariantMap getManagedObjects()
{QDBusInterface manager(BLUEZ_DBUS_SERVICE, "/","org.freedesktop.DBus.ObjectManager", QDBusConnection::systemBus());QDBusReply<ManagedObjectList> reply = manager.call("GetManagedObjects");if (!reply.isValid()) {qWarning() << "Failed to get managed objects:" << reply.error().message();return QVariantMap();}ManagedObjectList objects = reply.value();QVariantMap result;foreach (const QDBusObjectPath &path, objects.keys()) {InterfaceList interfaces = objects.value(path);foreach (const QString &interface, interfaces.keys()) {result[path.path()] = interfaces.value(interface);}}return result;
}

需要自定义类型 ManagedObjectList 和 InterfaceList：

cpp

typedef QMap<QString, QVariantMap> InterfaceList;
typedef QMap<QDBusObjectPath, InterfaceList> ManagedObjectList;Q_DECLARE_METATYPE(InterfaceList)
Q_DECLARE_METATYPE(ManagedObjectList)

4. 过滤已配对的蓝牙设备

遍历返回的对象，提取出org.bluez.Device1接口中的设备信息，并筛选出已配对的设备。

cpp

void getPairedDevices(BluetoothDeviceList_t &deviceList)
{QVariantMap objects = getManagedObjects();QSet<QString> uniqueAddresses; // 去重foreach (const QString &path, objects.keys()) {QVariantMap deviceProps = objects[path].toMap();if (deviceProps.contains("Name") && deviceProps.contains("Address") &&deviceProps.contains("Paired")) {QString name = deviceProps["Name"].toString();QString address = deviceProps["Address"].toString();bool paired = deviceProps["Paired"].toBool();if (!name.isEmpty() && !uniqueAddresses.contains(address) && paired) {uniqueAddresses.insert(address);BluetoothDevice_t device;device.address = address;device.Name = name;device.Paired = paired;device.Connected = deviceProps["Connected"].toBool();device.Icon = deviceProps["Icon"].toString();deviceList << device;}}}
}

5. 数据结构定义

定义蓝牙设备的数据结构：

cpp

struct BluetoothDevice_t {QString address;QString Name;QString Icon;QString Alias;bool Connected;bool Paired;
};typedef QList<BluetoothDevice_t> BluetoothDeviceList_t;

6. 注册元类型

为了让Qt支持跨线程传递自定义结构体，需要注册元类型：

cpp

qRegisterMetaType<BluetoothDevice_t>("BluetoothDevice_t");
qRegisterMetaType<InterfaceList>("InterfaceList");
qRegisterMetaType<ManagedObjectList>("ManagedObjectList");

7. 展示设备列表

将获取到的设备列表展示在QTableWidget中：

cpp

void setPairedDeviceList(const BluetoothDeviceList_t &deviceList)
{int row_count = deviceList.count();if (row_count <= 0) return;ui->tableWidget->setRowCount(row_count);ui->tableWidget->setColumnCount(1);for (int row = 0; row < row_count; ++row) {const BluetoothDevice_t &device = deviceList.at(row);QTableWidgetItem *item = new QTableWidgetItem(device.Name);item->setData(Qt::UserRole, device.address);item->setData(Qt::UserRole + 1, device.Paired);item->setData(Qt::UserRole + 2, device.Connected);QBrush brush = QColor(0, 0, 0);if (device.Connected && device.Paired) {brush = QColor(0x00DC00); // 绿色} else if (device.Paired) {brush = QColor(0x3E81DA); // 蓝色}item->setForeground(brush);ui->tableWidget->setItem(row, 0, item);}ui->tableWidget->selectRow(0);
}