ncurses_getch() will block if there is no input available. Using fgets() together with stream_set_blocking() has been proposed for non-blocking input, however, fgets() returns escape sequences for cursor, function, and other special keys. Interpreting these is not trivial as the escape sequences depend on the terminal/emulation used.
A possible solution is to use stream_select() to find out whether input is available and then read it with ncurses_getch().
<?php
function getch_nonblock($timeout) {
$read = array(STDIN);
$null = null; // stream_select() uses references, thus variables are necessary for the first 3 parameters
if(stream_select($read,$null,$null,floor($timeout / 1000000),$timeout % 1000000) != 1) return null;
return ncurses_getch();
}
while(true) {
$key = getch_nonblock(1000000);
if(is_null($key)) {
// do something useful here
continue;
}
if($key == NCURSES_KEY_F10) break; // Quit on F10
}
?>
Low timeout values can yield high CPU usage of your script, so set the timeout as high as possible for your application.
ncurses_getch
(PHP 4 >= 4.0.7, PHP 5 < 5.3.0, PECL ncurses >= 1.0.0)
ncurses_getch — Lit un caractère sur le clavier
Description
ncurses_getch
( void
) : int
Avertissement
Cette fonction est EXPERIMENTALE. Le comportement de cette fonction, son nom, et toute la documentation autour de cette fonction peut changer sans préavis dans une prochaine version de PHP. Cette fonction doit être utilisée à vos risques et périls.
Avertissement
Cette fonction est actuellement non documentée ; seule la liste des arguments est disponible.
add a note
User Contributed Notes 5 notes
Anonymous ¶
10 years ago
php at kormoc dot com ¶
18 years ago
After banging my head over this for awhile, I discovered, you must use ncurses_keypad($window, true); to enable the arrow keys and f keys to work correctly.
joeldegan AT yahoo.com ¶
21 years ago
When using getch to capture KEY_* events remember that the keypad is arranged like this:
+-----+------+-------+
| A1 | up | A3 |
+-----+------+-------+
|left | B2 | right |
+-----+------+-------+
| C1 | down | C3 |
+-----+------+-------+
You use has_key to capture these and act upon them.
man curs_getch for more info.
pablorNOSPAM at nkstudios dot net ¶
21 years ago
A custom php ncurses_getstr function..
<?php
function ncurses_getstr($strlen){
for ($x=0;$x<$strlen;$x++){
$string .= chr(ncurses_getch());
}
return $string;
}
ncurses_init();
ncurses_addstr(ncurses_getstr(6));
ncurses_refresh();
ncurses_getch();
ncurses_end();
?>
petr at hroch dot info ¶
17 years ago
While function ncurses_nodelay() is still not implemented and if you need a non-blocking getch,
following code might help.
<?php
$init = ncurses_init();
$full = ncurses_newwin (0,0,0,0);
ncurses_wborder($full,0,0,0,0,0,0,0,0);
ncurses_wrefresh($full);
$running = true;
$fp = fopen("php://stdin","r"); //open direct input stream for reading
stream_set_blocking($fp,0); //set non-blocking mode
while ($running) {
while (($buf = fgets($fp, 4096)) != false) { //fgets is required if we want to handle escape sequenced keys
$buffer .= $buf;
}
if ($buffer != "") {
switch ($buffer) {
case " ": { //exit on space key
ncurses_end();
exit;
}
default: {
ncurses_mvwaddstr($full,2,2,"$buffer"); //display input
}
}
$buffer = ""; //empty buffer
}
// You can do something interesting here, while we're not waiting for an input
ncurses_mvwaddstr($full,4,4,microtime(true));
ncurses_wrefresh($full);
usleep(1); //reduce cpu usage
}
?>
