bluez glib编程 --- 代码片段参考

创建数组 ay, a{sv}

          gchar data_gchar[] = {0xAA,0x00,0x00,0x00,0x01,0x00,0xFE,0x14,0x4F,0x01,0x00,0x00,0xA3,0x21};

        GVariantBuilder builder_ay;
        g_variant_builder_init(&builder_ay, G_VARIANT_TYPE("ay"));
        for (guint16 i = 0; i < sizeof(data_gchar); i++) {  
            g_variant_builder_add_value(&builder_ay, g_variant_new_byte(data_gchar[i]));  
        }
        GVariant *variant_ay = g_variant_builder_end(&builder_ay);
        gchar *str_ay = g_variant_print(variant_ay, TRUE);
        RM_LOGI("%s", str_ay);

        GVariantBuilder builder_asv;
        g_variant_builder_init(&builder_asv, G_VARIANT_TYPE("a{sv}"));
        g_variant_builder_add(&builder_asv, "{sv}", "offset", g_variant_new_uint16(0));
        g_variant_builder_add(&builder_asv, "{sv}", "type", g_variant_new_string("command"));
        GVariant *variant_asv = g_variant_builder_end(&builder_asv);
        gchar *str_asv = g_variant_print(variant_asv, TRUE);
        RM_LOGI("%s", str_asv);

创建复合变量 aya{sv}

        gchar data_gchar[] = {0xAA,0x00,0x00,0x00,0x01,0x00,0xFE,0x14,0x4F,0x01,0x00,0x00,0xA3,0x21};
        
        GVariantBuilder builder_ay;
        g_variant_builder_init(&builder_ay, G_VARIANT_TYPE("ay"));
        for (guint16 i = 0; i < sizeof(data_gchar); i++) {  
            g_variant_builder_add_value(&builder_ay, g_variant_new_byte(data_gchar[i]));  
        }

        GVariantBuilder builder_asv;
        g_variant_builder_init(&builder_asv, G_VARIANT_TYPE("a{sv}"));
        g_variant_builder_add(&builder_asv, "{sv}", "offset", g_variant_new_uint16(0));
        g_variant_builder_add(&builder_asv, "{sv}", "type", g_variant_new_string("command"));

        GVariant *variant =  g_variant_new("(aya{sv})", &builder_ay, &builder_asv);
        gchar *str = g_variant_print(variant, TRUE);
        RM_LOGI("%s", str);

获取某个接口的某个属性

    GDBusProxy *device1;
    device1 = g_dbus_proxy_new_sync(conn,
                      G_DBUS_PROXY_FLAGS_NONE,
                      NULL,
                      "org.bluez",
                      path,
                      "org.bluez.Device1",
                      NULL,
                      &error);
    PRINT_ERROR_LOG("Device1");

    GVariant *name = NULL; 
    char *name_str = NULL;
    name = g_dbus_proxy_get_cached_property(device1, "Name");
    if(name != NULL) {
        g_variant_get(name, "s", &name_str);
        g_variant_unref(name);
    } else {
        goto done;
    }

遍历远端蓝牙某个接口的所有属性

    result = g_dbus_connection_call_sync(
        conn,
        "org.bluez",
        "/org/bluez/hci0/dev_A4_C1_38_10_09_2C",
        "org.freedesktop.DBus.Properties",
        "GetAll",
        g_variant_new("(s)", "org.bluez.Device1"), // 指定获取某个接口的所有属性
        G_VARIANT_TYPE("(a{sv})"),
        G_DBUS_CALL_FLAGS_NONE,
        -1,
        NULL,
        &error
    );

    if(error != NULL) {
        printf("error get property: %s\n", error->message);
        g_error_free(error);
        return 1;
    }

    GVariantIter *prop_iter;
    gchar *prop_name;
    GVariant *prop_value;
    
    // 遍历所有属性
    g_variant_get(result, "(a{sv})", &prop_iter);
    while (g_variant_iter_next(prop_iter, "{sv}", &prop_name, &prop_value)) {
        gchar *value_str = g_variant_print(prop_value, TRUE);
        g_print("    %s: %s\n", prop_name, value_str);
        g_free(value_str);
        g_variant_unref(prop_value);
        g_free(prop_name);
    }
    g_variant_iter_free(prop_iter);
    g_variant_unref(result);

多重循环

    GVariantIter *iter;
    gchar *service_path;
    GVariant *interfaces_and_properties;
    gchar *object;
    g_variant_get(managedObjects, "(a{oa{sa{sv}}})", &iter);
    while (g_variant_iter_next(iter, "{oa{sa{sv}}}", &service_path, &interfaces_and_properties)) {
        printf("%s\n", service_path);
        if (g_str_has_prefix(service_path, object)) {
            GVariantIter *iface_iter;
            gchar *interface_name;
            GVariant *properties;

            g_variant_get(interfaces_and_properties, "a{sa{sv}}", &iface_iter);
            while (g_variant_iter_next(iface_iter, "{sa{sv}}", &interface_name, &properties)) {
                if (g_strcmp0(interface_name, "org.bluez.GattService1") == 0) {
                    g_print("Found service: %s\n", service_path);
                    // 在这里你可以进一步获取特征并进行操作
                }
                g_variant_unref(properties);
                g_free(interface_name);
            }
            g_variant_iter_free(iface_iter);
        }
        g_variant_unref(interfaces_and_properties);
        g_free(service_path);
    }
    g_variant_iter_free(iter);