Question

我正在尝试使用Bluez Api的rssi参数与蓝牙设备保持距离。我从互联网上下载了代码并运行它。该错误告诉我缺少方法“DefaultAdapter”。但我不知道这种方法的签名。可能在那里我还有其他一些错误。我在下面粘贴我的代码：任何其他更简单的代码链接都是好的。我收到错误无法获取托管对象：GDBus.Error：org.freedesktop.DBus.Error.UnknownMethod：接口“org.bluez.Manager”上带有签名“”的方法“DefaultAdapter”不存在，使用bluez apis获取rssi的距离< / p>

pthread_t threadId;
#define BLUEZ_BUS_NAME "org.bluez"
#define BLUEZ_INTF_ADAPTER "org.bluez.Adapter"

static GDBusConnection *dbus_conn = NULL;
static GMainLoop *main_loop;


struct handler_data {
  const char *bt_address;
  short rssi;
};

/*
 * Callback function for the DeviceFound signal from the org.bluez.Adapter
 * interface.
 */
static void
device_found_handler (GDBusConnection *connection,
                        const gchar *sender_name,
                        const gchar *object_path,
                        const gchar *interface_name,
                        const gchar *signal_name,
                        GVariant *parameters,
                        gpointer user_data)
{
  char *device_address;
  gboolean res;
  short rssi;
  GVariant *property_dict;
  struct handler_data *data = (struct handler_data *)user_data;

  /*
   * Paramter format: sa{sv}
   * Only interested in the RSSI so lookup that entry in the properties
   * dictionary.
   */
  g_variant_get(parameters, "(&s*)", &device_address, &property_dict);

  if (strcmp(data->bt_address, device_address)) {
    /* Not the device of interest */
    return;
  }

  res = g_variant_lookup(property_dict, "RSSI", "n",
                         &rssi);
  if (!res) {
    printf("Unable to get device address from dbus\n");

  g_main_loop_quit(main_loop);
    return;
  }

  data->rssi = rssi;
  g_main_loop_quit(main_loop);
}

/*
 * Gets the RSSI for a given BT device address.
 */
static short
get_rssi(const char *bt_address)
{
  GError *error = NULL;
  GVariant *reply = NULL;
  char *adapter_object = NULL;
  struct handler_data data;

  data.bt_address = bt_address;

  main_loop = g_main_loop_new(NULL, FALSE);
  if (!main_loop) {
    printf("Error creating main loop\n");
    return 0;
  }

  dbus_conn = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
  if (error) {
    printf("Unable to get dbus connection\n");
    return 0;
  }

  /* Get the default BT adapter. Needed to start device discovery */
  reply = g_dbus_connection_call_sync(dbus_conn,
                                      BLUEZ_BUS_NAME,
                                      "/",
                                      "org.bluez.Manager",
                                      "DefaultAdapter",
                                      NULL,
                                      G_VARIANT_TYPE("(o)"),
                                      G_DBUS_CALL_FLAGS_NONE,
                                      -1,
                                      NULL,
                                      &error);

  if (error) {
    printf("Unable to get managed objects: %s\n", error->message);
    return 0;
  }
  g_variant_get(reply, "(&o)", &adapter_object);

  /* Register a handler for DeviceFound signals to read the device RSSI */
  g_dbus_connection_signal_subscribe(dbus_conn,
                                     NULL,
                                     "org.bluez.Adapter",
                                     "DeviceFound",
                                     NULL,
                                     NULL,
                                     /*0*/G_DBUS_SIGNAL_FLAGS_NONE,
                                     device_found_handler,
                                     &data,
                                     NULL);

  /* Start device discovery */
  reply = g_dbus_connection_call_sync(dbus_conn,
                                     BLUEZ_BUS_NAME,
                                     adapter_object,
                                     "org.bluez.Adapter",
                                     "StartDiscovery",
                                     NULL,
                                     NULL,
                                     G_DBUS_CALL_FLAGS_NONE,
                                     -1,
                                     NULL,
                                     &error);

  if (error) {
    printf("Unable to start discovery: %s\n", error->message);
    return 0;
  }

  g_main_loop_run(main_loop);

  return data.rssi;
}










void* getSetDeviceDetails(void * arg)
{

    char* destinationAddress = new char[strlen((char*)arg)+1];
    strcpy(destinationAddress, (char*)arg);
short rssi = 0;
rssi = get_rssi(destinationAddress);
cout<< "rssi=" << rssi<< endl;

}


void scanDevices(inquiry_info **ii, int * sock, int * num_rsp)
{
    int max_rsp;
    int dev_id, len, flags;
    int i;

    dev_id = hci_get_route(NULL);
    *sock = hci_open_dev( dev_id );
    if (dev_id < 0 || sock < 0) {
        perror("opening socket");
        exit(1);
    }

    len  = 8;
    max_rsp = 255;
    flags = IREQ_CACHE_FLUSH;
    *ii = (inquiry_info*)malloc(max_rsp * sizeof(inquiry_info));

    *num_rsp = hci_inquiry(dev_id, len, max_rsp, NULL, ii, flags);
    if( num_rsp < 0 ) perror("hci_inquiry");
    printf("num devices = %d\n",*num_rsp);

}



int main()
{
inquiry_info *ii = NULL;
    int  num_rsp, i, sock;
    char addr[19] = { 0 };
    char name[248] = { 0 };
    scanDevices(&ii, &sock, &num_rsp);

    close( sock );
    char destinationAddress[18];
                ba2str(&(ii)->bdaddr, destinationAddress);
                cout<<destinationAddress<<"print"<<endl;
                pthread_create(&threadId,0,getSetDeviceDetails,(void*)destinationAddress);
                pthread_join(threadId,0);
    free( ii );
}

我从互联网上获得了另一个代码。它最初发布时遇到了一些问题。但是这个人写过他在ioctl之前没有连接到服务器。他纠正了它并且有效。我下载了他的代码并遇到了同样的问题。链接到那 https://communities.intel.com/thread/100186

有人可以提出任何建议。

如何在linux中使用bluez api找到rssi和距离

0 个答案: