Registers an EventListenerCB against an event_type
.
callback |
the EventListenerCB to be registered against an event type. |
event_type |
a character string indicating the type of events for which notification is requested. See register for a description of the format. |
callback_destroyed |
A DestroyNotify called when the callback is destroyed. |
user_data |
User data to be passed to the callback. |
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