DOFObject DOFObject_Advertise DOFObject_BeginDefine DOFObject_BeginGet DOFObject_BeginInvoke DOFObject_BeginProvide DOFObject_BeginRegister DOFObject_BeginSession DOFObject_BeginSet DOFObject_BeginSubscribe DOFObject_Changed DOFObject_Copy DOFObject_CreateInterfaceList DOFObject_Define DOFObject_Destroy DOFObject_Get DOFObject_GetObjectID DOFObject_GetSystem DOFObject_Invoke DOFObject_IsInterestRequested DOFObject_IsSignalRequired DOFObject_Set DOFObject_Signal

boolean DOFObject_IsSignalRequired ( const DOFObject  obj, const DOFInterfaceEvent  evt  ) Ask whether any Requestors have registered an Event handler for the given object of this provider. This allows an application to decide whether or not to create the event parameters and call DOFObject_Signal. When this function returns FALSE, a DOFObject_Signal call will not do anything (so it can safely be skipped). Parameters obj The DOFObject on which to operate. This should not be NULL. evt The DOFInterfaceEvent in question. This should not be NULL. Returns TRUE if evt is registered for this object. FALSE if evt is not registered for this object. Exceptions FALSE is returned if obj is NULL, or evt is NULL or is not an DOFInterfaceEvent.