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ReadKey(3) User Contributed Perl Documentation ReadKey(3)
NAME
Term::ReadKey - A perl module for simple terminal control
SYNOPSIS
use Term::ReadKey;
ReadMode 4; # Turn off controls keys
while (not defined ($key = ReadKey(-1))) {
# No key yet
}
print "Get key $key\n";
ReadMode 0; # Reset tty mode before exiting
DESCRIPTION
Term::ReadKey is a compiled perl module dedicated to providing simple control over
terminal driver modes (cbreak, raw, cooked, etc.,) support for non-blocking reads, if the
architecture allows, and some generalized handy functions for working with terminals. One
of the main goals is to have the functions as portable as possible, so you can just plug
in "use Term::ReadKey" on any architecture and have a good likelyhood of it working.
ReadMode MODE [, Filehandle]
Takes an integer argument, which can currently be one of the following values:
0 Restore original settings.
1 Change to cooked mode.
2 Change to cooked mode with echo off.
(Good for passwords)
3 Change to cbreak mode.
4 Change to raw mode.
5 Change to ultra-raw mode.
(LF to CR/LF translation turned off)
Or, you may use the synonyms:
restore
normal
noecho
cbreak
raw
ultra-raw
These functions are automatically applied to the STDIN handle if no other handle
is supplied. Modes 0 and 5 have some special properties worth mentioning: not only
will mode 0 restore original settings, but it cause the next ReadMode call to save
a new set of default settings. Mode 5 is similar to mode 4, except no CR/LF
translation is performed, and if possible, parity will be disabled (only if not
being used by the terminal, however. It is no different from mode 4 under
Windows.)
If you are executing another program that may be changing the terminal mode, you
will either want to say
ReadMode 1
system('someprogram');
ReadMode 1;
which resets the settings after the program has run, or:
$somemode=1;
ReadMode 0;
system('someprogram');
ReadMode 1;
which records any changes the program may have made, before resetting the mode.
ReadKey MODE [, Filehandle]
Takes an integer argument, which can currently be one of the following values:
0 Perform a normal read using getc
-1 Perform a non-blocked read
>0 Perform a timed read
(If the filehandle is not supplied, it will default to STDIN.) If there is nothing
waiting in the buffer during a non-blocked read, then undef will be returned. Note
that if the OS does not provide any known mechanism for non-blocking reads, then a
"ReadKey -1" can die with a fatal error. This will hopefully not be common.
If MODE is greater then zero, then ReadKey will use it as a timeout value in
seconds (fractional seconds are allowed), and won't return "undef" until that time
expires. (Note, again, that some OS's may not support this timeout behaviour.) If
MODE is less then zero, then this is treated as a timeout of zero, and thus will
return immediately if no character is waiting. A MODE of zero, however, will act
like a normal getc.
There are currently some limitations with this call under Windows. It may be
possible that non-blocking reads will fail when reading repeating keys from more
then one console.
ReadLine MODE [, Filehandle]
Takes an integer argument, which can currently be one of the following values:
0 Perform a normal read using scalar(<FileHandle>)
-1 Perform a non-blocked read
>0 Perform a timed read
If there is nothing waiting in the buffer during a non-blocked read, then undef
will be returned. Note that if the OS does not provide any known mechanism for
non-blocking reads, then a "ReadLine 1" can die with a fatal error. This will
hopefully not be common. Note that a non-blocking test is only performed for the
first character in the line, not the entire line. This call will probably not do
what you assume, especially with ReadMode's higher then 1. For example, pressing
Space and then Backspace would appear to leave you where you started, but any
timeouts would now be suspended.
This call is currently not available under Windows.
GetTerminalSize [Filehandle]
Returns either an empty array if this operation is unsupported, or a four element
array containing: the width of the terminal in characters, the height of the
terminal in character, the width in pixels, and the height in pixels. (The pixel
size will only be valid in some environments.)
Under Windows, this function must be called with an "output" filehandle, such as
STDOUT, or a handle opened to CONOUT$.
SetTerminalSize WIDTH,HEIGHT,XPIX,YPIX [, Filehandle]
Return -1 on failure, 0 otherwise. Note that this terminal size is only for
informative value, and changing the size via this mechanism will not change the
size of the screen. For example, XTerm uses a call like this when it resizes the
screen. If any of the new measurements vary from the old, the OS will probably
send a SIGWINCH signal to anything reading that tty or pty.
This call does not work under Windows.
GetSpeeds [, Filehandle]
Returns either an empty array if the operation is unsupported, or a two value
array containing the terminal in and out speeds, in decimal. E.g, an in speed of
9600 baud and an out speed of 4800 baud would be returned as (9600,4800). Note
that currently the in and out speeds will always be identical in some OS's. No
speeds are reported under Windows.
GetControlChars [, Filehandle]
Returns an array containing key/value pairs suitable for a hash. The pairs consist
of a key, the name of the control character/signal, and the value of that
character, as a single character. This call does nothing under Windows.
Each key will be an entry from the following list:
DISCARD
DSUSPEND
EOF
EOL
EOL2
ERASE
ERASEWORD
INTERRUPT
KILL
MIN
QUIT
QUOTENEXT
REPRINT
START
STATUS
STOP
SUSPEND
SWITCH
TIME
Thus, the following will always return the current interrupt character, regardless
of platform.
%keys = GetControlChars;
$int = $keys{INTERRUPT};
SetControlChars [, Filehandle]
Takes an array containing key/value pairs, as a hash will produce. The pairs
should consist of a key that is the name of a legal control character/signal, and
the value should be either a single character, or a number in the range 0-255.
SetControlChars will die with a runtime error if an invalid character name is
passed or there is an error changing the settings. The list of valid names is
easily available via
%cchars = GetControlChars();
@cnames = keys %cchars;
This call does nothing under Windows.
AUTHOR
Kenneth Albanowski <kjahds AT kjahds.com>
Currently maintained by Jonathan Stowe <jns AT gellyfish.com>
perl v5.16.3 2005-01-11 ReadKey(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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