FORM_HOOK(3CURSES) Curses Library Functions FORM_HOOK(3CURSES)

NAME

form_hook, set_form_init, form_init, set_form_term, form_term,
set_field_init, field_init, set_field_term, field_term - assign
application-specific routines for invocation by forms

SYNOPSIS

cc [ flag... ] file... -lform -lcurses [ library... ]
#include <form.h>


int set_form_init(FORM *form, void (*func)(FORM*));


void (*form_init)(FORM *form);


int set_form_term(FORM *form, void (*func)(FORM*));


void (*form_term)(FORM *form);


int set_field_init(FORM *form, void (*func)(FORM*));


void (*field_init)(FORM *form);


int set_field_term(FORM *form, void (*func)(FORM*));


void (*field_term)(FORM *form);

DESCRIPTION

These routines allow the programmer to assign application specific
routines to be executed automatically at initialization and
termination points in the forms application. The user need not
specify any application-defined initialization or termination
routines at all, but they may be helpful for displaying messages or
page numbers and other chores.


set_form_init() assigns an application-defined initialization
function to be called when the form is posted and just after a page
change. form_init() returns a pointer to the initialization
function, if any.


set_form_term() assigns an application-defined function to be called
when the form is unposted and just before a page change. form_term()
returns a pointer to the function, if any.


set_field_init() assigns an application-defined function to be called
when the form is posted and just after the current field changes.
field_init() returns a pointer to the function, if any.


set_field_term() assigns an application-defined function to be called
when the form is unposted and just before the current field changes.
field_term() returns a pointer to the function, if any.

RETURN VALUES

Routines that return pointers always return NULL on error. Routines
that return an integer return one of the following:

E_OK
The function returned successfully.


E_SYSTEM_ERROR
System error.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | Unsafe |
+---------------+-----------------+

SEE ALSO

curses(3CURSES), forms(3CURSES), attributes(7)

NOTES

The header <form.h> automatically includes the headers <eti.h> and
<curses.h>.

December 31, 1996 FORM_HOOK(3CURSES)