bluez glib编程 --- API 功能介绍

遍历数组

g_variant_iter_next (GVariantIter, "{sa{sv}}", &gchar, &GVariantIter)
g_variant_iter_next (GVariantIter, "{sv}", &gchar, &GVariant)
g_variant_iter_next (GVariantIter, "s", &gchar)

从 GVariant 变量获取子成员变量

g_variant_get(GVariant, "(sa{sv}as)", &gchar, &GVariantIter, &GVariantIter)
g_variant_get(GVariant, "(oa{sa{sv}})", &gchar, &GVariantIter)
g_variant_get(GVariant, "(a{oa{sa{sv}}})", &GVariantIter)
g_variant_get(GVariant, "ay", &GVariantIter);
g_variant_get(GVariant, "s", &gchar)

判断 path 是不是 service_path 的前缀

g_str_has_prefix(service_path, path)

把 GVariant 变量转换为字符串形式，方便打印查看

gchar *value_str = g_variant_print(manufacturerData, TRUE);

连接蓝牙设备

        variant_connect = g_dbus_proxy_call_sync(
            device1,
            "Connect", // 连接成功后，服务特征对象还得等一会儿才能出现，所以连接成功后不能立马通信
            NULL,
            G_DBUS_CALL_FLAGS_NONE,
            -1,
            NULL,
            &error
        );

注意：如果调用出现错误 le-connection-abort-by-local后，需要间隔一段时间再调用或者读取属性值 Connected，否则再调用Connect虽然没出现错误，但是还是未连接，如下：

读属性值

        device1 = g_dbus_proxy_new_sync(conn,
                        G_DBUS_PROXY_FLAGS_NONE,
                        NULL,
                        "org.bluez",
                        path,
                        "org.bluez.Device1",
                        NULL,
                        &error);
        PRINT_WARN_LOG("Device1");
        GVariant *flag_connected = NULL;
        flag_connected = g_dbus_proxy_get_cached_property(device1, "Connected");

注意：每次读属性值都得重新连接下接口，否则读取的属性不是最新的

和 bluetoothd 通信的步骤

1、连接总线

2、连接接口

3、方法调用 / 属性获取

连接总线

g_bus_get_sync

（总线+接口）连接

g_dbus_proxy_new_for_bus_sync

接口连接 + 方法调用

    GVariant *managedObjects = g_dbus_connection_call_sync(

        conn,

        "org.bluez",

        "/",

        "org.freedesktop.DBus.ObjectManager",

        "GetManagedObjects",

        NULL,

        G_VARIANT_TYPE("(a{oa{sa{sv}}})"),

        G_DBUS_CALL_FLAGS_NONE,

        -1,

        NULL,

        &error

    );

接口连接

g_dbus_proxy_new_sync

方法调用

    GVariant *result = g_dbus_proxy_call_sync(adapter1,

                    "RemoveDevice",

                    g_variant_new("(o)", path_object),

                    G_DBUS_CALL_FLAGS_NONE,

                    -1,

                    NULL,

                    &error);

属性获取

g_dbus_proxy_get_cached_property