Raising StopIteration in pygi-invoke

[Damien Caliste <damien caliste cea fr>]

Hello,

   I'm trying to give Python iterator capabilities to my C objects. I've
got already an object in my C library that is a container and I've got
also some C routines to iterate on that container.
   Using GI, I created a C routine that is named my_object___iter__(),
which only calls my own C iterator creation routine. Then, on this
iterator, I've created two routines called my_object_iter___iter__()
and my_object_iter_next() that gives Python iterator capabilities to
the bindings on my_object.
   It works in Python, except that the _next() routine must raise
StopIteration to fulfill its job. I added then a GError **error
argument to my _next() routine to be able to throw this exception. But
in pygi-invoke, there's currently no way to raise anything else than
PyExc_RuntimeError or PyExc_Exception. A TODO speaks of a way to use
the right domain, so I'm interested with its implementation. Would you
have some suggestions ?


   Besides, I've got another issue about the iterators. I'll give
an example with GtkListStore and GtkTreeIter to be clear.
   The following code is working well except that it has a memory leak:
/* Returns: (transfer none):*/
GtkTreeIter* gtk_list_store___iter__(GtkListStore *list)
{
   GtkTreeIter *iter = g_malloc(sizeof(GtkTreeIter));
   return iter;
}
/* Returns: (transfer none):*/
gpointer gtk_tree_iter_next(GtkTreeIter *iter,
                            GError **error)
{
   gpointer data;

   gtk_tree_model_get(iter->model, iter, 0, &data, NULL);
   if (gtk_tree_model_next(iter->model, iter))
     return data;
   else
     *error = g_error_new(g_quark_from_static_string(StopIteration),
0, "");
   return NULL;
}
   Would someone may help me how to solve this, or point me to
resources with some information on how to bind C itrerators to Python
one using GI ?

   I can send more information if I'm not clear enough. If this
capability is not possible with current implementation, I'm interested
in providing patches to pygobject to help the project.

Thanks,

Damien.