pszComputerName (PSZ) - input

Printer server name to unregister for alert notification.

This value is NULL for local printer ports.

pszName (PSZ) - input

Case-sensitive name of printer port to unregister for alerts.

This value can be a virtual port name.

ulHandle (ULONG) - input

Spooler alert handle previously allocated by SplRegister.

ulCategory (ULONG) - input

Category of alert to unregister.

This value can be the core alert category or an extended alert category as defined below:

PRTALERT_CATEGORY_ALL - 0x00000000

Unregister for all alerts for the given alert handle. This will remove registration for all printer ports (even remote ones) for the alert handle.
PRTALERT_CATEGORY_ALL_CORE - 0x00000002
Unregister for all core alerts for the port.
PRTALERT_CATEGORY_ALL_EXT - 0x00000003
Unregister for all extended alerts for the port.
PRTALERT_CATEGORY_CORE - 0x00000001
Core alert category. This will remove registration for only those core alerts whose bits are set in ulType for the port.
PRTALERT_CATEGORY_EXT_MAX - 0x0000DFFF
End of the extended alert categories.
PRTALERT_CATEGORY_EXTENDED - 0x0000D000
Beginning of the extended alert categories. Protocol converters should limit the category range to between 0x0000D000 and 0x0000DFFFF.
If the protocol converter does not support the given category, ERROR_INVALID_CATEGORY(117) is returned.

ulType (ULONG) - input

Type of alert to unregister for the given category.

If the category is PRTALERT_CATEGORY_CORE, then this is a bit-field that defines the core alerts to unregister.

If the category is not PRTALERT_CATEGORY_ALL, PRTALERT_CATEGORY_CORE, PRTALERT_CATEGORY_ALL_CORE, or PRTALERT_CATEGORY_ALL_EXT, this is a value that defines the specific extended alert to unregister.

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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