gupnp_service_info_get_introspection

Get resource introspection of service or register callback if corresponding parameter was passed.

A service proxy identifier.

The callback function to be called when introspection object is ready. Typically, callback function takes on three parameters. The introspection parameter's identifier being the first, error parameter's message being the second, and the arg is third.

User data for callback.

Return true if callback function was defined. Return introspection identifier if callback function was omited.

Issues E_WARNING with not valid callback function.