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 csa_unregister_callback(library call) csa_unregister_callback(library call)




 NAME    [Toc]    [Back]
      csa_unregister_callback - unregister the specified callback functions

 SYNOPSIS    [Toc]    [Back]
      #include <xcsa.h>
      CSA_return_code csa_unregister_callback(
      CSA_session_handle session,
      CSA_flags reason,
      CSA_callback callback,
      CSA_buffer client_data,
      CSA_extension *unregister_callback_extensions);

 DESCRIPTION    [Toc]    [Back]
      The csa_unregister_callback function removes the specified callback
      procedure to the specified callback list.  Both the procedure and the
      client data must match for this function to remove the procedure.
      Specifying a value of NULL for both callback and client data will
      cause all callbacks on the specified callback list(s) to be removed.

    Session (Session Handle)    [Toc]    [Back]
      Opaque session handle that represents a session with the calendaring
      service.

      Session handles are created by a logon function call and invalidated
      with a logoff function call.  If the session handle is invalid, then
      the error CSA_E_INVALID_SESSION_HANDLE is returned.

    Reason (Flags)    [Toc]    [Back]
      A bitmask of flags.  Unspecified flags should always be passed as 0.
      Undocumented flags are reserved.  Each flag corresponds to a callback
      list.  Flag settings include:

      CSA_CB_CALENDAR_LOGON
                If set, the new callback will be invoked when a the calendar
                is accessed by a user.

      CSA_CB_CALENDAR_DELETED
                If set, the new callback will be invoked when a user
                requests that the calendar be deleted.

      CSA_CB_CALENDAR_ATTRIBUTE_UPDATED
                If set, the new callback will be invoked whenever a calendar
                attribute is updated.

      CSA_CB_ENTRY_ADDED
                If set, the new callback will be invoked whenever an entry
                is added to the calendar.

      CSA_CB_ENTRY_DELETED
                If set, the new callback will be invoked whenever an entry
                is deleted from the calendar.



                                    - 1 -       Formatted:  January 24, 2005






 csa_unregister_callback(library call) csa_unregister_callback(library call)




      CSA_CB_ENTRY_UPDATED
                If set, the new callback will be invoked whenever an entry
                is updated on the calendar.  It is implementation specific
                if the callback function is invoked before or after the
                specified update type occurs.

    Callback (Callback)    [Toc]    [Back]
      Specifies the client procedure that should be removed from the
      specified callback list(s).

    Client Data (Opaque Data)    [Toc]    [Back]
      A pointer to an application specific data structure that was specified
      when the callback procedure was registered.  This must match for the
      function to succeed.  This constraint allows the application to
      register the same function on more than one callback list with
      different client_data.  The instances of the callback function on the
      different callback lists will be treated independently by the calendar
      service.

    Unregister Callback Extensions (Extension)    [Toc]    [Back]
      A pointer to an array of CSA_extension structures for this function.
      The array may contain both input extensions for providing additional
      information to the function and output extensions for receiving
      information from the function.  A value of NULL indicates that the
      caller is not using any extensions.  See the extensions structure for
      more information.

 RETURN VALUE    [Toc]    [Back]
    Unregister Callback Extensions (Extension)
      If output extensions were passed to the function in the extensions
      list, the results from the service will be available in the extension.
      See the extensions structure for more information.  Whether the
      function succeeded or not, and, if not, why.  It may be success or one
      of the values listed under ERRORS below.

 ERRORS    [Toc]    [Back]
      The csa_unregister_callback function returns the following error
      values:

      CSA_E_CALLBACK_NOT_REGISTERED
                The specified callback function was not registered.

      CSA_E_FAILURE
                There was a general failure that does not fit the
                description of any other error code.

      CSA_E_INSUFFICIENT_MEMORY
                Insufficient memory was available to complete the requested
                operation.





                                    - 2 -       Formatted:  January 24, 2005






 csa_unregister_callback(library call) csa_unregister_callback(library call)




      CSA_E_INVALID_FLAG
                A flag value in the flags argument was invalid.

      CSA_E_INVALID_FUNCTION_EXT
                The function extension requested is invalid.

      CSA_E_INVALID_PARAMETER
                A function parameter was invalid.

      CSA_E_INVALID_SESSION_HANDLE
                The specified Session Handle is invalid or no longer valid
                (e.g., after logging off).

      CSA_E_NO_AUTHORITY
                The user has insufficient authority for this function.

      CSA_E_NOT_SUPPORTED
                The operation requested is not supported by this
                implementation.

      CSA_E_SERVICE_UNAVAILABLE
                The requested calendar service is unavailable.

      CSA_E_UNSUPPORTED_FLAG
                The flag requested is not supported.

      CSA_E_UNSUPPORTED_FUNCTION_EXT
                The specified function extension is not supported or
                CSA_EXT_REQUIRED is set.

 SEE ALSO    [Toc]    [Back]
      csa/csa.h - csacsa(5), csa_add_calendar(3), csa_add_entry(3),
      csa_call_callbacks(3), csa_delete_calendar(3), csa_delete_entry(3),
      csa_free(3), csa_free_time_search(3), csa_list_calendar_attributes(3),
      csa_list_calendars(3), csa_list_entries(3),
      csa_list_entry_attributes(3), csa_list_entry_sequence(3),
      csa_logoff(3), csa_logon(3), csa_look_up(3),
      csa_query_configuration(3), csa_read_calendar_attributes(3),
      csa_read_entry_attributes(3), csa_read_next_reminder(3),
      csa_register_callback(3), csa_update_calendar_attributes(3),
      csa_update_entry_attributes(3).


                                    - 3 -       Formatted:  January 24, 2005
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