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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>&lt;form.h&gt;</STRONG>

       <STRONG>int</STRONG> <STRONG>set_field_init(FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>,</STRONG> <STRONG>Form_Hook</STRONG> <EM>func</EM><STRONG>);</STRONG>
       <STRONG>Form_Hook</STRONG> <STRONG>field_init(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>

       <STRONG>int</STRONG> <STRONG>set_field_term(FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>,</STRONG> <STRONG>Form_Hook</STRONG> <EM>func</EM><STRONG>);</STRONG>
       <STRONG>Form_Hook</STRONG> <STRONG>field_term(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>

       <STRONG>int</STRONG> <STRONG>set_form_init(FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>,</STRONG> <STRONG>Form_Hook</STRONG> <EM>func</EM><STRONG>);</STRONG>
       <STRONG>Form_Hook</STRONG> <STRONG>form_init(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>

       <STRONG>int</STRONG> <STRONG>set_form_term(FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>,</STRONG> <STRONG>Form_Hook</STRONG> <EM>func</EM><STRONG>);</STRONG>
       <STRONG>Form_Hook</STRONG> <STRONG>form_term(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>


</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>&lt;form.h&gt;</STRONG>  automatically  includes  the  header  file
       <STRONG>&lt;curses.h&gt;</STRONG>.


</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
       These  routines  emulate  the  System  V  forms library.  They were not
       supported 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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<ul>
<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>
<li><a href="#h2-AUTHORS">AUTHORS</a></li>
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