# curs_get_wch 3x

## NAME

           get_wch,  wget_wch, mvget_wch, mvwget_wch, unget_wch - get
           (or push back) a wide character from curses terminal  key-
           board

## SYNOPSIS

           #include <curses.h>

           int get_wch(win_t *wch);
           int wget_wch(WINDOW *win, win_t *wch);
           int mvget_wch(int y, int x, win_t *wch);
           int mvwget_wch(WINDOW *win, int y, int x, win_t *wch);
           int unget_wch(const wchar_t wch);

## DESCRIPTION

           The get_wch, wget_wch, mvget_wch, and mvwget_wch functions
           read a character from the  terminal  associated  with  the
           current  or  specified  window.   In  no-delay mode, if no
           input is waiting, the value ERR  is  returned.   In  delay
           mode,  the  program  waits  until  the  system passes text
           through to the  program.   Depending  on  the  setting  of
           cbreak,  this  is  after  one  character (cbreak mode), or
           after the first newline (nocbreak  mode).   In  half-delay
           mode,  the  program waits until the user types a character
           or the specified timeout interval has elapsed.

           Unless noecho has been set, these routines echo the  char-
           acter into the designated window.

           If  the window is not a pad and has been moved or modified
           since the last call to wrefresh, wrefresh will  be  called
           before another character is read.

           If  keypad  is  enabled,  these  functions  respond to the
           pressing of a function key by setting the  object  pointed
           to  by  wch  to  the  corresponding  KEY_ value defined in
           <curses.h> and returning  KEY_CODE_YES.   If  a  character
           (such as escape) that could be the beginning of a function
           key is received, curses sets a timer.  If the remainder of
           the  sequence  does  arrive  within  the  designated time,
           curses passes through  the  character;  otherwise,  curses
           returns  the  function  key  value.  For this reason, many
           terminals experience a  delay  between  the  time  a  user
           presses the escape key and the time the escape is returned
           to the program.

           The unget_wch function pushes the wide character wch  back
           onto the head of the input queue, so the wide character is
           returned by the next call to get_wch.  The pushback of one
           character  is  guaranteed.  If the program calls unget_wch
           too many times without an intervening call to get_wch, the
           operation may fail.

## NOTES

           The  header  file  <curses.h>  automatically  includes the
           header file <stdio.h>.

           Applications should not define the escape key by itself as
           a single-character function.

           When  using  get_wch,  wget_wch, mvget_wch, or mvwget_wch,
           applications should not use nocbreak mode and echo mode at
           the  same  time.  Depending on the state of the tty driver
           when each character is  typed,  the  program  may  produce
           undesirable results.

           All functions except wget_wch and unget_wch may be macros.

## RETURN VALUES

           When get_wch, wget_wch, mvget_wch,  and  mvwget_wch  func-
           tions  successfully report the pressing of a function key,
           they return KEY_CODE_YES.  When they successfully report a
           wide  character,  they  return OK.  Otherwise, they return
           ERR.

           Upon successful completion, unget_wch returns OK.   Other-
           wise, the function returns ERR.

## SEE ALSO

           curses(3x),        curs_getch(3x),       curs_ins_wch(3x),
           curs_inopts(3x), curs_move(3x), curs_refresh(3x)