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($key == NCURSES_KEY_F10) break; // Quit on F10
}
?>
Low timeout values can yield high CPU usage of your script, so set the timeout as high as possible for your application.
ncurses_getch
(PHP 4 >= 4.0.7, PHP 5 < 5.3.0, PECL ncurses >= 1.0.0)
ncurses_getch — Read a character from keyboard
Descrição
ncurses_getch
( void
) : int
Aviso
Esta função é EXPERIMENTAL. O comportamento, seu nome e documentação podem mudar sem aviso em futuras versões do PHP. Utilize por sua própria conta e risco.
Aviso
Esta função não está documentada; somente a lista de argumentos está disponível.
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User Contributed Notes 5 notes
Anonymous ¶
10 years ago
php at kormoc dot com ¶
18 years ago
After banging my head over this for awhile, I discovered, you must use ncurses_keypad($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 ¶
22 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 ¶
18 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
}
?>
