SplUnRegister Return Value - rc

rc (ULONG) - returns

Return codes.
• Success

  ERROR_FILE_NOT_FOUND(2)

  pszName is not a valid port name.
  ERROR_INVALID_HANDLE(6)
  The value ulHandle is not a valid spooler alert handle.
  ERROR_INVALID_PARAMETER(87)
  An invalid buffer given.
  ERROR_NOT_SUPPORTED(50)
  The spooler on the given print server cannot support alert notification.
  PMERR_SPL_NOT_REGISTERED(0x4042)
  The alert handle ulHandle is not currently registered for any alerts specified by ulCategory and ulType.
  PMERR_SPL_SPOOLER_NOT_INSTALLED(0x4009)
  The spooler is not enabled.

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