1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
<!--
****************************************************************************
* Copyright 2018-2019,2020 Thomas E. Dickey *
* Copyright 2002-2016,2017 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************
* @Id: curs_get_wch.3x,v 1.13 2020/02/02 23:34:34 tom Exp @
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
<TITLE>curs_get_wch 3x</TITLE>
<link rel="author" href="mailto:bug-ncurses@gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</HEAD>
<BODY>
<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>
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.
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.
</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></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>
</div>
</BODY>
</HTML>
|
