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<H1 class="no-header">curs_get_wch 3x</H1>
<PRE>
<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><a name="h2-NAME">NAME</a></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 keyboard
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></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><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
</PRE><H3><a name="h3-wget_wch">wget_wch</a></H3><PRE>
The <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions read a char-
acter from the terminal associated with the current or specified win-
dow. In no-delay mode, if no input is waiting, the value <STRONG>ERR</STRONG> is re-
turned. 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 character 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 keycode as-
signed to the function key, and returning <STRONG>KEY_CODE_YES</STRONG>. If a character
(such as escape) that could be the beginning of a function key is re-
ceived, curses sets a timer. If the remainder of the sequence does ar-
rive 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 keycodes returned by these functions are the same as those returned
by <STRONG>wgetch</STRONG>:
<STRONG>o</STRONG> The predefined function keys are listed in <STRONG><curses.h></STRONG> as macros
with values outside the range of 8-bit characters. Their names be-
gin with <STRONG>KEY_</STRONG>.
<STRONG>o</STRONG> Other (user-defined) function keys which may be defined using <STRONG>de-</STRONG>
<STRONG><A HREF="define_key.3x.html">fine_key(3x)</A></STRONG> have no names, but also are expected to have values
outside the range of 8-bit characters.
</PRE><H3><a name="h3-unget_wch">unget_wch</a></H3><PRE>
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 pro-
gram calls <STRONG>unget_wch</STRONG> too many times without an intervening call to
<STRONG>get_wch</STRONG>, the operation may fail.
Unlike <STRONG>ungetch</STRONG> and <STRONG>wgetch</STRONG>, <STRONG>unget_wch</STRONG> cannot distinguish special charac-
ters returned by <STRONG>wget_wch</STRONG> from ordinary characters. An application can
push special keys which it may read via <STRONG>wget_wch</STRONG> by checking for the
<STRONG>KEY_CODE_YES</STRONG> result, and using <STRONG>ungetch</STRONG> for those special keys.
</PRE><H2><a name="h2-NOTES">NOTES</a></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 pro-
gram may produce undesirable results.
All functions except <STRONG>wget_wch</STRONG> and <STRONG>unget_wch</STRONG> may be macros.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
When <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions successful-
ly 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>. Other-
wise, they return <STRONG>ERR</STRONG>.
Upon successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>. Otherwise, the func-
tion returns <STRONG>ERR</STRONG>.
Functions with a "mv" prefix first perform a cursor movement using
<STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
the window pointer is null.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></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>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
<ul>
<li><a href="#h3-wget_wch">wget_wch</a></li>
<li><a href="#h3-unget_wch">unget_wch</a></li>
</ul>
</li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
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