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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 keyboard

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 associ-ated associated
       ated  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 character 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  ter-minals terminals
       minals  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 functions 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.  Otherwise, the function returns ERR.

SEE ALSO
       curses(3X), curs_getch(3X), curs_ins_wch(3X), curs_inopts(3X), curs_move(3X), curs_refresh (3X)



                                                                                            curs_get_wch (3X)