Load modules in Gtk+ IMModules

[Nan Ye <nan ye francetelecom com cn>]

Hi all,
Now, I'm developing my own text input method module by using the
GtkIMModule.
My own text input method is seperated to two major component, one is
input engine and the other one
is input helper. Input engine tooks response for retrieving the correct
candidates for users inputs, while the Input
helper charges for displaying them to the screen. And various input
engines and input helpers are supported.
my own text input method module here, plays the part of manager to
choose the proper input engine and input
helper for the current user. So I want my module can load the need
engines or helpers module dynamically.
The specific GtkIMModule is loaded as a module when the input method is
selected, so all types in the module
will be register use g_type_module_register_type(). I load my engines
and helpers module in the class initizlize
function and call g_type_module_use() and unload them in class finalzie
function. Here is the problem, the first time
I select my own input method module from the pop-up menu of a editable
widget, it works perfect. But after I change
to other input methods and re-select it again, an error occurs:
Two different plugins tried to register 'xxxxx'.
xxxx is a widget class defined in the helper module. Here are piece of
my code:
static void
gtk_im_context_ptim_init(GTypeInstance * this, gpointer class)
{
GtkIMContextPTIM * this_ptim = GTK_IM_CONTEXT_PTIM(this);

...
this->helper_module = g_object_new(PTIM_TYPE_HELPER_MODULE, NULL);
this->helper_module->path = g_strdup(module_path);
g_type_module_set_name(G_TYPE_MODULE(this->helper_module),
this->helper_module->path);

if (g_type_module_use(G_TYPE_MODULE(this->helper_module)))
{
gboolean res = TRUE;

if (this->helper_module->helper_moudule_init)
{
res =
this->helper_module->helper_moudule_init(G_TYPE_MODULE(this->helper_module));
}

return res;
}
return;
}

...

static void gtk_im_context_ptim_finalize(GObject * this)
{
GtkIMContextPTIM * this_ptim = GTK_IM_CONTEXT_PTIM(this);
GtkIMContext * super_class;

...
g_type_module_unuse(G_TYPE_MODULE(this_ptim->helper_module));

/* Super class finalizatoin. */
super_class = g_type_class_peek(g_type_parent(GTK_TYPE_IM_CONTEXT_PTIM));
G_OBJECT_CLASS(super_class)->finalize(this);

return;
}

The PTIM_TYPE_HELPER_MODULE is a sub-class of GTypeModule defined by
myself to implement a specific helper module.
helper_moudule_init() register all the types unsed by helper widgets.
So, could anyone give some advices about the problem?

Best regards,
Nan Ye