csa_unregister_callback(library call)

NAME
csa_unregister_callback — unregister the specified callback functions

SYNOPSIS

#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

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)

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)

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.

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)

Specifies the client procedure that should be removed from the specified callback list(s).

  Client Data (Opaque Data)

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)

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

  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

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.

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

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).