release/src/router/libncurses/doc/html/man/curs_get_wch.3x.html

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  30   * @Id: curs_get_wch.3x,v 1.7 2010/08/14 23:31:42 tom Exp @
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  39 <H1>curs_get_wch 3x</H1>
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  41 <PRE>
  42 <!-- Manpage converted by man2html 3.0.1 -->
  43 <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>                                       <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2>NAME</H2><PRE>
  50        <STRONG>get_wch</STRONG>,  <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, <STRONG>mvwget_wch</STRONG>, <STRONG>unget_wch</STRONG> - get
  51        (or push back) a wide character from curses terminal  key-
  52        board
  53
  54
  55 </PRE>
  56 <H2>SYNOPSIS</H2><PRE>
  57        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  58
  59        <STRONG>int</STRONG> <STRONG>get_wch(wint_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>wget_wch(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>mvget_wch(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
  62        <STRONG>int</STRONG> <STRONG>mvwget_wch(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>,</STRONG> <STRONG>wint_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
  63        <STRONG>int</STRONG> <STRONG>unget_wch(const</STRONG> <STRONG>wchar_t</STRONG> <EM>wch</EM><STRONG>);</STRONG>
  64
  65
  66 </PRE>
  67 <H2>DESCRIPTION</H2><PRE>
  68        The <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions
  69        read a character from the  terminal  associated  with  the
  70        current  or  specified  window.   In  no-delay mode, if no
  71        input is waiting, the value <STRONG>ERR</STRONG>  is  returned.   In  delay
  72        mode,  the  program  waits  until  the  system passes text
  73        through to the  program.   Depending  on  the  setting  of
  74        <STRONG>cbreak</STRONG>,  this  is  after  one  character (cbreak mode), or
  75        after the first newline (nocbreak  mode).   In  half-delay
  76        mode,  the  program waits until the user types a character
  77        or the specified timeout interval has elapsed.
  78
  79        Unless <STRONG>noecho</STRONG> has been set, these routines echo the  char-
  80        acter into the designated window.
  81
  82        If  the window is not a pad and has been moved or modified
  83        since the last call to <STRONG>wrefresh</STRONG>, <STRONG>wrefresh</STRONG> will  be  called
  84        before another character is read.
  85
  86        If  <STRONG>keypad</STRONG>  is  enabled,  these  functions  respond to the
  87        pressing of a function key by setting the  object  pointed
  88        to  by  <EM>wch</EM>  to  the  corresponding  <STRONG>KEY_</STRONG> value defined in
  89        <STRONG>&lt;curses.h&gt;</STRONG> and returning  <STRONG>KEY_CODE_YES</STRONG>.   If  a  character
  90        (such as escape) that could be the beginning of a function
  91        key is received, curses sets a timer.  If the remainder of
  92        the  sequence  does  arrive  within  the  designated time,
  93        curses passes through  the  character;  otherwise,  curses
  94        returns  the  function  key  value.  For this reason, many
  95        terminals experience a  delay  between  the  time  a  user
  96        presses the escape key and the time the escape is returned
  97        to the program.
  98
  99        The <STRONG>unget_wch</STRONG> function pushes the wide character <EM>wch</EM>  back
 100        onto the head of the input queue, so the wide character is
 101        returned by the next call to <STRONG>get_wch</STRONG>.  The pushback of one
 102        character  is  guaranteed.  If the program calls <STRONG>unget_wch</STRONG>
 103        too many times without an intervening call to <STRONG>get_wch</STRONG>, the
 104        operation may fail.
 105
 106
 107 </PRE>
 108 <H2>NOTES</H2><PRE>
 109        The  header  file  <STRONG>&lt;curses.h&gt;</STRONG>  automatically  includes the
 110        header file <STRONG>&lt;stdio.h&gt;</STRONG>.
 111
 112        Applications should not define the escape key by itself as
 113        a single-character function.
 114
 115        When  using  <STRONG>get_wch</STRONG>,  <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, or <STRONG>mvwget_wch</STRONG>,
 116        applications should not use <STRONG>nocbreak</STRONG> mode and <STRONG>echo</STRONG> mode at
 117        the  same  time.  Depending on the state of the tty driver
 118        when each character is  typed,  the  program  may  produce
 119        undesirable results.
 120
 121        All functions except <STRONG>wget_wch</STRONG> and <STRONG>unget_wch</STRONG> may be macros.
 122
 123
 124 </PRE>
 125 <H2>RETURN VALUES</H2><PRE>
 126        When  <STRONG>get_wch</STRONG>,  <STRONG>wget_wch</STRONG>,  <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> func-
 127        tions successfully report the pressing of a function  key,
 128        they return <STRONG>KEY_CODE_YES</STRONG>.  When they successfully report a
 129        wide character, they return <STRONG>OK</STRONG>.   Otherwise,  they  return
 130        <STRONG>ERR</STRONG>.
 131
 132        Upon  successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>.  Other-
 133        wise, the function returns <STRONG>ERR</STRONG>.
 134
 135        Functions with a "mv" prefix first perform a cursor  move-
 136        ment  using  <STRONG>wmove</STRONG>, and return an error if the position is
 137        outside the window, or if the window pointer is null.
 138
 139
 140 </PRE>
 141 <H2>SEE ALSO</H2><PRE>
 142        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>,       <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>,        <STRONG><A HREF="curs_ins_wch.3x.html">curs_ins_wch(3x)</A></STRONG>,
 143        <STRONG><A HREF="curs_inopts.3x.html">curs_inopts(3x)</A></STRONG>, <STRONG><A HREF="curs_move.3x.html">curs_move(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
 144
 145
 146
 147                                                        <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
 148 </PRE>
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