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<H1>form_hook 3x</H1>
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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="form_hook.3x.html">form_hook(3x)</A></STRONG> <STRONG><A HREF="form_hook.3x.html">form_hook(3x)</A></STRONG>
</PRE>
<H2>NAME</H2><PRE>
<STRONG>form_hook</STRONG> - set hooks for automatic invocation by applica-
tions
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><form.h></STRONG>
int set_field_init(FORM *form, void (*func)(FORM *));
void (*)(FORM *) field_init(const FORM *form);
int set_field_term(FORM *form, void (*func)(FORM *));
void (*)(FORM *) field_term(const FORM *form);
int set_form_init(FORM *form, void (*func)(FORM *));
void (*)(FORM *) form_init(const FORM *form);
int set_form_term(FORM *form, void (*func)(FORM *));
void (*)(FORM *) form_term(const FORM *form);
</PRE>
<H2>DESCRIPTION</H2><PRE>
These functions make it possible to set hook functions to
be called at various points in the automatic processing of
input event codes by <STRONG>form_driver</STRONG>.
The function <STRONG>set_field_init</STRONG> sets a hook to be called at
form-post time and each time the selected field changes
(after the change). <STRONG>field_init</STRONG> returns the current field
init hook, if any (<STRONG>NULL</STRONG> if there is no such hook).
The function <STRONG>set_field_term</STRONG> sets a hook to be called at
form-unpost time and each time the selected field changes
(before the change). <STRONG>field_term</STRONG> returns the current field
term hook, if any (<STRONG>NULL</STRONG> if there is no such hook).
The function <STRONG>set_form_init</STRONG> sets a hook to be called at
form-post time and just after a page change once it is
posted. <STRONG>form_init</STRONG> returns the current form init hook, if
any (<STRONG>NULL</STRONG> if there is no such hook).
The function <STRONG>set_form_term</STRONG> sets a hook to be called at
form-unpost time and just before a page change once it is
posted. <STRONG>form_init</STRONG> returns the current form term hook, if
any (<STRONG>NULL</STRONG> if there is no such hook).
</PRE>
<H2>RETURN VALUE</H2><PRE>
Routines that return pointers return <STRONG>NULL</STRONG> on error. Other
routines return one of the following:
<STRONG>E_OK</STRONG> The routine succeeded.
<STRONG>E_SYSTEM_ERROR</STRONG>
System error occurred (see <STRONG>errno</STRONG>).
</PRE>
<H2>SEE ALSO</H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>.
</PRE>
<H2>NOTES</H2><PRE>
The header file <STRONG><form.h></STRONG> automatically includes the header
file <STRONG><curses.h></STRONG>.
</PRE>
<H2>PORTABILITY</H2><PRE>
These routines emulate the System V forms library. They
were not supported on Version 7 or BSD versions.
</PRE>
<H2>AUTHORS</H2><PRE>
Juergen Pfeifer. Manual pages and adaptation for new
curses by Eric S. Raymond.
<STRONG><A HREF="form_hook.3x.html">form_hook(3x)</A></STRONG>
</PRE>
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