Unsubscribes to event channels matching the specified id, callback, and userData.

Passing NULL values makes it possible to unsubscribe from multiple channels in the same call.

Sending a NULL or empty id matches any id.

Sending a NULL callback matches any callback.

Sending a NULL userData matches any userData.

The call is synchronous.

See Subscribe(String,EventSummaryCallback,IntPtr) for more information.


  • id : string : Name of the channel to unsubscribe from.
  • callback : EventSummaryCallback : The EventSummaryCallback that specifies the function to call when the data is available.
  • userData : IntPtr : The userData sent to the callback when invoked.


Status : Status that indicates if the operation succeeds.