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  37 <TITLE>form_hook 3x 2024-03-16 ncurses 6.4 Library calls</TITLE>
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  42 <H1 class="no-header">form_hook 3x 2024-03-16 ncurses 6.4 Library calls</H1>
  43 <PRE>
  44 <STRONG><A HREF="form_hook.3x.html">form_hook(3x)</A></STRONG>                    Library calls                   <STRONG><A HREF="form_hook.3x.html">form_hook(3x)</A></STRONG>
  45
  46
  47
  48
  49 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
  50        <STRONG>form_hook</STRONG> - set hooks for automatic invocation by applications
  51
  52
  53 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  54        <STRONG>#include</STRONG> <STRONG>&lt;form.h&gt;</STRONG>
  55
  56        <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>
  57        <STRONG>Form_Hook</STRONG> <STRONG>field_init(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>
  58
  59        <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>
  60        <STRONG>Form_Hook</STRONG> <STRONG>field_term(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>
  61
  62        <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>
  63        <STRONG>Form_Hook</STRONG> <STRONG>form_init(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>
  64
  65        <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>
  66        <STRONG>Form_Hook</STRONG> <STRONG>form_term(const</STRONG> <STRONG>FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>);</STRONG>
  67
  68
  69 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  70        These  functions make it possible to set hook functions to be called at
  71        various points in the automatic processing  of  input  event  codes  by
  72        <STRONG>form_driver</STRONG>.
  73
  74
  75 </PRE><H3><a name="h3-set_field_init">set_field_init</a></H3><PRE>
  76        sets  a  hook to be called at form-post time and each time the selected
  77        field changes (after the change).
  78
  79
  80 </PRE><H3><a name="h3-field_init">field_init</a></H3><PRE>
  81        returns the current field init hook, if any (<STRONG>NULL</STRONG> if there is  no  such
  82        hook).
  83
  84
  85 </PRE><H3><a name="h3-set_field_term">set_field_term</a></H3><PRE>
  86        sets a hook to be called at form-unpost time and each time the selected
  87        field changes (before the change).
  88
  89
  90 </PRE><H3><a name="h3-field_term">field_term</a></H3><PRE>
  91        returns the current field term hook, if any (<STRONG>NULL</STRONG> if there is  no  such
  92        hook).
  93
  94
  95 </PRE><H3><a name="h3-set_form_init">set_form_init</a></H3><PRE>
  96        sets a hook to be called at form-post time and just after a page change
  97        once it is posted.
  98
  99
 100 </PRE><H3><a name="h3-form_init">form_init</a></H3><PRE>
 101        returns the current form init hook, if any (<STRONG>NULL</STRONG> if there  is  no  such
 102        hook).
 103
 104
 105 </PRE><H3><a name="h3-set_form_term">set_form_term</a></H3><PRE>
 106        sets  a  hook  to  be called at form-unpost time and just before a page
 107        change once it is posted.
 108
 109
 110 </PRE><H3><a name="h3-form_term">form_term</a></H3><PRE>
 111        returns the current form term hook, if any (<STRONG>NULL</STRONG> if there  is  no  such
 112        hook).
 113
 114
 115 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 116        Routines  that  return  pointers  return <STRONG>NULL</STRONG> on error.  Other routines
 117        return one of the following:
 118
 119        <STRONG>E_OK</STRONG> The routine succeeded.
 120
 121        <STRONG>E_SYSTEM_ERROR</STRONG>
 122             System error occurred (see <STRONG>errno(3)</STRONG>).
 123
 124
 125 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
 126        These routines emulate the System  V  forms  library.   They  were  not
 127        supported on Version 7 or BSD versions.
 128
 129
 130 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
 131        Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S.
 132        Raymond.
 133
 134
 135 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 136        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>
 137
 138
 139
 140 ncurses 6.4                       2024-03-16                     <STRONG><A HREF="form_hook.3x.html">form_hook(3x)</A></STRONG>
 141 </PRE>
 142 <div class="nav">
 143 <ul>
 144 <li><a href="#h2-NAME">NAME</a></li>
 145 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 146 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 147 <ul>
 148 <li><a href="#h3-set_field_init">set_field_init</a></li>
 149 <li><a href="#h3-field_init">field_init</a></li>
 150 <li><a href="#h3-set_field_term">set_field_term</a></li>
 151 <li><a href="#h3-field_term">field_term</a></li>
 152 <li><a href="#h3-set_form_init">set_form_init</a></li>
 153 <li><a href="#h3-form_init">form_init</a></li>
 154 <li><a href="#h3-set_form_term">set_form_term</a></li>
 155 <li><a href="#h3-form_term">form_term</a></li>
 156 </ul>
 157 </li>
 158 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 159 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 160 <li><a href="#h2-AUTHORS">AUTHORS</a></li>
 161 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 162 </ul>
 163 </div>
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