dbus-glib - passing structs as arguments

[Steve Kreyer]

Hi,

to my knowledge structs are represented by the dbus-glib-binding via the
type GValueArray.

Why using dbus_g_proxy_call directly? Theres a little tool which
generates you dbus_g_proxy_call invocations in the right way. It is
called dbus-binding-tool. You feed it with your XML interface
specification and it generates for you easy-to-use wrapper functions
around  dbus_g_proxy_call for synchronous and asynchronous method calls.

All you have to do is to allocate the GValueArray and pass it to the
generated function in your application:

  GError *error = NULL;
  GValueArray *dbus_struct;
  GValue dbus_struct_member = {0};

  dbus_struct = g_value_array_new(0);

  g_value_init (&dbus_struct_member, G_TYPE_STRING);

  g_value_set_string (&dbus_struct_member, "value of first member");
  g_value_array_append (dbus_struct, &dbus_struct_member);

  g_value_set_string (&dbus_struct_member, "value of second member");
  g_value_array_append (dbus_struct, &dbus_struct_member);

  dbus_binding_tool_generated_method (proxy, dbus_struct, &error);

HTH,
Steve

Stanislav Popov wrote:
> Hi all,
> I read D-Bus Tutorial and many other documents!
>
> I have only one problem.
> I am using dbus-glib and I am trying to invoke a method with parameters.
> I would like to pass structures to dbus_g_proxy_call() function.
> For example I have (ss) type.
>
> I tried |DBUS_TYPE_STRUCT which is mentioned in |D-Bus Tutorial| but it 
> seems it is not working with GLIB.
> I got:
> |
>
>    1.
>       (process:835): GLib-GObject-WARNING **: gtype.c:3312: type id
>       `115' is invalid
>    2.
>        
>    3.
>       (process:835): GLib-GObject-WARNING **: can't peek value table for
>       type `<unknown>' which is not currently referenced
>    4.
>       Segmentation fault
>
>
> So I did the following:
>
> #define G_STRUCT_STR_STR (dbus_g_type_get_struct("GValueArray", 
> G_TYPE_STRING, G_TYPE_STRING, G_TYPE_INVALID))
>
> GValue *value;
>
> value = g_new0 (GValue, 1);
> g_value_init (value, G_STRUCT_STR_STR);
> g_value_take_boxed (value, dbus_g_type_specialized_construct 
> (G_STRUCT_STR_STR));
>
> dbus_g_type_struct_set (value, 0, "192.168.0.1", 1, "1234", G_MAXUINT);
> .....
>
> dbus_g_proxy_call (proxy, "SetInfo", &error, G_STRUCT_STR_STR, value, 
> G_TYPE_INVALID, G_TYPE_INVALID))
>
> ------
> but I got Segmentation Fault on dbus_g_proxy_call().
>
> Where am I wrong?
>
> Can you help me, please?
>
> Thanks in advance,
> Stanislav
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