DOFOperation DOFSystem_BeginInterest	(	const DOFSystem	sys,
		const DOFObjectID	objectID,
		const DOFInterfaceID	interfaceID,
		DOFInterestLevel	level,
		DOFOperationControl	config,
		uint32	timeout,
		const DOFSystemInterestCallback	callback,
		void *	context
	)

Express interest for an Object ID and an Interface IDs.

This is a request only; the callback is called only when the request is complete (timed out or cancelled) and does not indicate a response.

Resource Management:: This function allocates resources that must later be freed by calling DOFOperation_Destroy.

Parameters

sys	The system in which the Interest request is to be made. This must not be NULL.
objectID	The object ID on which to express interest. If level is DOFINTERESTLEVEL_WATCH, then this may be DOFOBJECTID_BROADCAST to express interest on all object IDs (other levels do not support broadcast). This should not be NULL.
interfaceID	The interface ID on which to express interest. If level is DOFINTERESTLEVEL_WATCH or DOFINTERESTLEVEL_ACTIVATE, then this may be DOFINTERFACEID_WILDCARD to express interest on all interface IDs (other levels do not support wildcard). This should not be NULL.
level	The level of interest to request. This should be a level from DOFInterestLevel.
config	Configuration options for the request operation (NULL for default configuration).
timeout	The duration for the asynchronous operation, in milliseconds. The timeout begins after the operation has been processed and sent to appropriate connections.
callback	Callback when operation completes. This may be NULL to ignore completion notification.
context	Application context data associated with the asynchronous operation.

Returns

A representation of the operation, or NULL if