dbus - 带数组的 Systemd dbus sd_bus_call_method()

Question

我正在尝试使用 systemd dbus 修改一些代码。

方法调用如下所示:

res = sd_bus_call_method(bus,
    SERVICE_NAME,
    OBJECT_PATH,
    INTERFACE,
    "AddData",
    &error, &m,
    "ss",
    data->key,
    data->valyue);

现在我试图将其更改为:

res = sd_bus_call_method(bus,
    SERVICE_NAME,
    OBJECT_PATH,
    INTERFACE,
    "AddData",
    &error, &m,
    "(a(ss))",
    /* WHAT DO I PASS HERE? */);

我找不到示例或文档，代码对我来说也不是很清楚。

Answer 1

来自文档 sd_bus_call_method

sd_bus_call_method() is a convenience function for initializing a bus message object and calling the corresponding D-Bus method. It combines the sd_bus_message_new_method_call(3), sd_bus_message_append(3) and sd_bus_call(3) functions into a single function call.

有关参数的详细信息，请参见 sd_bus_message_append() .

res = sd_bus_call_method(bus,
    SERVICE_NAME,
    OBJECT_PATH,
    INTERFACE,
    "AddData",
    &error, &m,
    "(a(ss))",
    1, /* size of array */
    "hello",
    "world");