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curs_get_wch 3x



curs_get_wch(3x)                                       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(wint_t *wch);
       int wget_wch(WINDOW *win, wint_t *wch);
       int mvget_wch(int y, int x, wint_t *wch);
       int mvwget_wch(WINDOW *win, int y, int x, wint_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 VALUE

       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.

       Functions with a "mv" prefix first perform a cursor  move-
       ment  using  wmove, and return an error if the position is
       outside the window, or if the window pointer is null.


SEE ALSO

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



                                                       curs_get_wch(3x)

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