[D-BUS] How append array of struct

[Claudio Takahasi]

Hi Havoc,

No error is returned.
At the ending of appending this code, the message signature should be
"yya(ss)(ss)". Is that correct?
However, the function that gets the signature return yya(ss). 

D-Bus message iterators is a new subject for me. I don't know the iterators
pointers works. What happens with the "struct_iter" when I close the container?
At first glance the elements are being overwritten inside the loop, isn't it?


Regarding the restore. When I tryed get the arguments using the code
below, the message "arguments to dbus_message_iter_open_container()
were incorrect, assertion "real->iter_type ==
DBUS_MESSAGE_ITER_TYPE_WRITER" failed" appeared.

dbus_message_iter_init(reply, &iter);
dbus_message_iter_get_basic((&iter, cnf);
dbus_message_iter_next(&iter);
dbus_message_iter_get_basic(&iter, &num_elem);
dbus_message_iter_next(&iter);
dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, array_sig,
&array_iter_read);
for ( i = 0; i < num_elem; i++) {
	dbus_message_iter_open_container(&array_iter_read, DBUS_TYPE_STRUCT, NULL
					&struct_iter_read);
	dbus_message_iter_get_basic(&struct_iter_read, &read_name);
	dbus_message_iter_next(&struct_iter_read);
	dbus_message_iter_get_basic(&struct_iter_read, &read_addr);
	if(read_name && read_addr) {
		printf("read :(%s, %s)\n", read_name, read_addr); 
	else {
		printf("read :(NULL, NULL)\n"); 
	}
	dbus_message_iter_close_container(&array_iter_read, &struct_iter_read);
}
dbus_message_iter_close_container(&iter, &array_iter_read);



Claudio.


On 8/2/05, Havoc Pennington <hp at redhat.com> wrote:
> On Tue, 2005-08-02 at 10:36 -0300, Claudio Takahasi wrote:
> > dbus_message_iter_append_basic(&iter, DBUS_TYPE_BYTE, &cnf);
> > dbus_message_iter_append_basic(&iter, DBUS_TYPE_BYTE, &dev_num);
> 
> I think cnf and dev_num here should be "unsigned char" rather than "int"
> btw
> 
> > dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, array_sig,
> > &array_iter);
> > for ( i = 0; i < dev_num; i++) {
> >       dbus_message_iter_open_container(&array_iter, DBUS_TYPE_STRUCT, struct_sig,
> >                       &struct_iter);
> >       dbus_message_iter_append_basic(&struct_iter, DBUS_TYPE_STRING, &ptr_name);
> >       dbus_message_iter_append_basic(&struct_iter, DBUS_TYPE_STRING, &ptr_addr);
> >       dbus_message_iter_close_container(&array_iter, &struct_iter);
> >       ptr_name = name1;
> >       ptr_addr = addr1;
> > }
> > dbus_message_iter_close_container(&iter, &array_iter);
> 
> When this fails do you get some kind of error message?
> 
> The open_container() for the struct can just have NULL instead of
> struct_sig for the contained type, though in theory the code would
> silently ignore that arg if you specify it.
> 
> Havoc
> 
> 
>