ncurses_getch

(PHP 4 >= 4.0.7, PHP 5 < 5.3.0, PECL ncurses >= 1.0.0)

ncurses_getch — Read a character from keyboard

说明

ncurses_getch ( void ) : int

Warning

此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担。

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User Contributed Notes 5 notes

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Anonymous ¶

5 years ago


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.

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php at kormoc dot com ¶

13 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.

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joeldegan AT yahoo.com ¶

16 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.

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pablorNOSPAM at nkstudios dot net ¶

16 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();

?>

down

-1

petr at hroch dot info ¶

12 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

}

?>

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官方地址：https://www.php.net/manual/en/function.ncurses-getch.php

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ncurses_getch

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User Contributed Notes 5 notes