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* @Id: curs_get_wch.3x,v 1.8 2012/11/03 23:03:59 tom Exp @
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<H1>curs_get_wch 3x</H1>
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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<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>
</PRE>
<H2>NAME</H2><PRE>
<STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, <STRONG>mvwget_wch</STRONG>, <STRONG>unget_wch</STRONG> - get
(or push back) a wide character from curses terminal key-
board
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>get_wch(wint_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
<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>
<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>
<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>
<STRONG>int</STRONG> <STRONG>unget_wch(const</STRONG> <STRONG>wchar_t</STRONG> <EM>wch</EM><STRONG>);</STRONG>
</PRE>
<H2>DESCRIPTION</H2><PRE>
The <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> 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 <STRONG>ERR</STRONG> is returned. In delay
mode, the program waits until the system passes text
through to the program. Depending on the setting of
<STRONG>cbreak</STRONG>, 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 <STRONG>noecho</STRONG> 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 <STRONG>wrefresh</STRONG>, <STRONG>wrefresh</STRONG> will be called
before another character is read.
If <STRONG>keypad</STRONG> is enabled, these functions respond to the
pressing of a function key by setting the object pointed
to by <EM>wch</EM> to the corresponding <STRONG>KEY_</STRONG> value defined in
<STRONG><curses.h></STRONG> and returning <STRONG>KEY_CODE_YES</STRONG>. 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 <STRONG>unget_wch</STRONG> function pushes the wide character <EM>wch</EM> back
onto the head of the input queue, so the wide character is
returned by the next call to <STRONG>get_wch</STRONG>. The pushback of one
character is guaranteed. If the program calls <STRONG>unget_wch</STRONG>
too many times without an intervening call to <STRONG>get_wch</STRONG>, the
operation may fail.
</PRE>
<H2>NOTES</H2><PRE>
The header file <STRONG><curses.h></STRONG> automatically includes the
header file <STRONG><stdio.h></STRONG>.
Applications should not define the escape key by itself as
a single-character function.
When using <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, or <STRONG>mvwget_wch</STRONG>,
applications should not use <STRONG>nocbreak</STRONG> mode and <STRONG>echo</STRONG> 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 <STRONG>wget_wch</STRONG> and <STRONG>unget_wch</STRONG> may be macros.
</PRE>
<H2>RETURN VALUE</H2><PRE>
When <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> func-
tions successfully report the pressing of a function key,
they return <STRONG>KEY_CODE_YES</STRONG>. When they successfully report a
wide character, they return <STRONG>OK</STRONG>. Otherwise, they return
<STRONG>ERR</STRONG>.
Upon successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>. Other-
wise, the function returns <STRONG>ERR</STRONG>.
Functions with a "mv" prefix first perform a cursor move-
ment using <STRONG>wmove</STRONG>, and return an error if the position is
outside the window, or if the window pointer is null.
</PRE>
<H2>SEE ALSO</H2><PRE>
<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>,
<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>
<STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
</PRE>
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