[Pyrex] Pyrex and None types

[John (J5) Palmieri]

I am having a problem with this code:

cdef class Message:
    cdef DBusMessage *msg

    def __init__(self, message_type=MESSAGE_TYPE_INVALID,
                 service=None, path=None, dbus_interface=None, method=None,
                 Message method_call=None,
                 name=None,
                 Message reply_to=None, error_name=None, error_message=None,
                 _create=1):

        cdef char *cservice
        cdef char *ciface
        cdef DBusMessage *cmsg

        ciface = NULL
        if (dbus_interface != None):
            ciface = interface

        cservice = NULL
        if service != None:
            cservice = service
            
        if not _create:
            return

        if message_type == MESSAGE_TYPE_METHOD_CALL:
            self.msg = dbus_message_new_method_call(cservice, path, ciface, method)
        elif message_type == MESSAGE_TYPE_METHOD_RETURN:
            cmsg = method_call._get_msg()
            self.msg = dbus_message_new_method_return(cmsg)
        elif message_type == MESSAGE_TYPE_SIGNAL:
            self.msg = dbus_message_new_signal(path, ciface, name)
        elif message_type == MESSAGE_TYPE_ERROR:
            cmsg = reply_to._get_msg()
            self.msg = dbus_message_new_error(cmsg, error_name, error_message)
            

It compiles file but I get this error message at runtime:


Traceback (most recent call last):
  File "test.py", line 6, in ?
    obj.ListNames()
  File "/home/boston/johnp/Devel/dbus/python/dbus.py", line 258, in
__call__
    message = dbus_bindings.MethodCall(self._object_path,
self._interface, self._method_name)
  File "dbus_bindings.pyx", line 1365, in
dbus_bindings.MethodCall.__init__
    def has_sender(self, service):
  File "dbus_bindings.pyx", line 1187, in dbus_bindings.Message.__init__
    Message method_call,
TypeError: expected string or Unicode object, NoneType found

Any ideas how to fix this?  It works fine if I set the dbus_interface to
some string.  It only fails if it equals None.  Thanks. 

-- 
John (J5) Palmieri
Associate Software Engineer
Desktop Group
Red Hat, Inc.
Blog: http://martianrock.com