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29 * @Id: curs_get_wch.3x,v 1.12 2019/11/30 21:06:30 tom Exp @
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41 <H1 class="no-header">curs_get_wch 3x</H1>
43 <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>
48 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
49 <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, <STRONG>mvwget_wch</STRONG>, <STRONG>unget_wch</STRONG> - get (or push
50 back) a wide character from curses terminal keyboard
53 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
54 <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
56 <STRONG>int</STRONG> <STRONG>get_wch(wint_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
57 <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>
58 <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>
59 <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>
60 <STRONG>int</STRONG> <STRONG>unget_wch(const</STRONG> <STRONG>wchar_t</STRONG> <EM>wch</EM><STRONG>);</STRONG>
63 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
64 The <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions read a char-
65 acter from the terminal associated with the current or specified win-
66 dow. In no-delay mode, if no input is waiting, the value <STRONG>ERR</STRONG> is re-
67 turned. In delay mode, the program waits until the system passes text
68 through to the program. Depending on the setting of <STRONG>cbreak</STRONG>, this is
69 after one character (cbreak mode), or after the first newline (nocbreak
70 mode). In half-delay mode, the program waits until the user types a
71 character or the specified timeout interval has elapsed.
73 Unless <STRONG>noecho</STRONG> has been set, these routines echo the character into the
76 If the window is not a pad and has been moved or modified since the
77 last call to <STRONG>wrefresh</STRONG>, <STRONG>wrefresh</STRONG> will be called before another character
80 If <STRONG>keypad</STRONG> is enabled, these functions respond to the pressing of a
81 function key by setting the object pointed to by <EM>wch</EM> to the keycode as-
82 signed to the function key, and returning <STRONG>KEY_CODE_YES</STRONG>. If a character
83 (such as escape) that could be the beginning of a function key is re-
84 ceived, curses sets a timer. If the remainder of the sequence does ar-
85 rive within the designated time, curses passes through the character;
86 otherwise, curses returns the function key value. For this reason,
87 many terminals experience a delay between the time a user presses the
88 escape key and the time the escape is returned to the program.
90 The keycodes returned by these functions are the same as those returned
91 by <STRONG>wgetch</STRONG>:
93 <STRONG>o</STRONG> The predefined function keys are listed in <STRONG><curses.h></STRONG> as macros
94 with values outside the range of 8-bit characters. Their names be-
95 gin with <STRONG>KEY_</STRONG>.
97 <STRONG>o</STRONG> Other (user-defined) function keys which may be defined using <STRONG>de-</STRONG>
98 <STRONG><A HREF="define_key.3x.html">fine_key(3x)</A></STRONG> have no names, but also are expected to have values
99 outside the range of 8-bit characters.
101 The <STRONG>unget_wch</STRONG> function pushes the wide character <EM>wch</EM> back onto the head
102 of the input queue, so the wide character is returned by the next call
103 to <STRONG>get_wch</STRONG>. The pushback of one character is guaranteed. If the pro-
104 gram calls <STRONG>unget_wch</STRONG> too many times without an intervening call to
105 <STRONG>get_wch</STRONG>, the operation may fail.
108 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
109 The header file <STRONG><curses.h></STRONG> automatically includes the header file
110 <STRONG><stdio.h></STRONG>.
112 Applications should not define the escape key by itself as a single-
115 When using <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, or <STRONG>mvwget_wch</STRONG>, applications
116 should not use <STRONG>nocbreak</STRONG> mode and <STRONG>echo</STRONG> mode at the same time. Depending
117 on the state of the tty driver when each character is typed, the pro-
118 gram may produce undesirable results.
120 All functions except <STRONG>wget_wch</STRONG> and <STRONG>unget_wch</STRONG> may be macros.
123 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
124 When <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions successful-
125 ly report the pressing of a function key, they return <STRONG>KEY_CODE_YES</STRONG>.
126 When they successfully report a wide character, they return <STRONG>OK</STRONG>. Other-
127 wise, they return <STRONG>ERR</STRONG>.
129 Upon successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>. Otherwise, the func-
130 tion returns <STRONG>ERR</STRONG>.
132 Functions with a "mv" prefix first perform a cursor movement using
133 <STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
134 the window pointer is null.
137 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
138 <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>,
139 <STRONG><A HREF="curs_move.3x.html">curs_move(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
143 <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
147 <li><a href="#h2-NAME">NAME</a></li>
148 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
149 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
150 <li><a href="#h2-NOTES">NOTES</a></li>
151 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
152 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>