EVT_BACNET_READRANGE (STRUCT)

TYPE EVT_BACNET_READRANGE : STRUCT

The ReadRange service hook

This is the type declaration for the Read-Range service application hook. This hook is given all of the parameters of a service request, and is responsible for all error checking. A pointer to the routine is registered with the BACnet server by BACnetSetHook. A hook can be registered by the registering API routine at any time. One hook procedure is registered per service. If a hook is registered more than once for the same service, the new hook procedure replaces the old one. A 0 procedure pointer can be used to deregister the hook. An Acknowledge Alarm hook must complete its service request processing by using one of the transaction completion API routines: BACnetSrvcAbortCbCompletion, BACnetSrvcErrorCbCompletion, BACnetSrvcIgnoreCbCompletion, or BACnetSrvcRejectCbCompletion. Hooks can access the local Properties maintained in the API database by using the BACnetStorePropertyInstance / BACnetRetrievePropertyInstance routines. A hook can choose not to override the default API processing of a service request by returning the value CB_STATUS_DEFAULT.

InOut:

Name	Type	Comment
pCBStatus	POINTER TO IEC_BACNET_CB_STATUS	CB-Status returned for the event. “Default” processes the standard APIs reaction, which needs no additional Callback-Signalling.
phTransaction	POINTER TO BYTE	This is the Transaction State Machine (TSM) handle for the current service request. It is generated by the BACnet API and is the first parameter given to the Hook- Completion functions.
sourceAddress	POINTER TO IEC_BACNET_ADDRESS	This is the MAC address of the BACnet addressed device from which the request has been sent.
destinationAddress	POINTER TO IEC_BACNET_ADDRESS	This is the MAC address of the device constructed by the application which has received the request.
pServiceInfo	POINTER TO IEC_BACNET_READ_RANGE_INFO	A pointer to the IEC_BACNET_READ_RANGE_INFO data structure. The fields of this data structure include object and property identifiers, array index if the property is an array of lists (BACNET_VOID_INDEX (-1) if not), a Range-Type tag and Range bounds.