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<H1 class="no-header">form_hook 3x</H1>
<PRE>
<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><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>form_hook</STRONG> - set hooks for automatic invocation by applications
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><form.h></STRONG>
int set_field_init(FORM *form, Form_Hook func);
Form_Hook field_init(const FORM *form);
int set_field_term(FORM *form, Form_Hook func);
Form_Hook field_term(const FORM *form);
int set_form_init(FORM *form, Form_Hook func);
Form_Hook form_init(const FORM *form);
int set_form_term(FORM *form, Form_Hook func);
Form_Hook form_term(const FORM *form);
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></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><a name="h2-RETURN-VALUE">RETURN VALUE</a></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(3)</STRONG>).
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
The header file <STRONG><form.h></STRONG> automatically includes the header file
<STRONG><curses.h></STRONG>.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
These routines emulate the System V forms library. They were not sup-
ported on Version 7 or BSD versions.
</PRE><H2><a name="h2-AUTHORS">AUTHORS</a></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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<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
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