我正在尝试找到一种从 POS 打印机获取纸张状态的方法;我想我会使用 GS a, GS r 序列,但我不明白如何从打印机返回信息;我在 Linux 下,POS 打印机在哪里返回有关状态的信息?
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我终于解决了我的问题......我在 linux 机器上使用 PHP,这是代码,希望对任何人有所帮助:
<?php
$device="/dev/usb/lp0";
$printer=fopen($device, 'w');
//La sequenza di ESCAPE DLE EOT n consente
//la trasmissione in realtime
//dello status
//n=1: printer status
//n=2: printer offline status
//n=3: error status
//n=4: paper roll sensor status
//Per n=4 i bits valorizzati sono:
//BIT Off/On Dec Desc
//0 Off 0 not used, fixed to Off
//1 On 2 not used, fixed to On
//2,3 Off 0 Paper adequate
//2,3 On 12 Paper near end detected
//4 On 16 Not used, fixed to On
//5,6 Off 0 Paper present
//5,6 Off 96 Paper roll end
//7 Off 0 Not used, fixed to Off
fwrite($printer,kbyte(16).kbyte(4).kbyte(4));
//fwrite($printer,kbyte(29).kbyte(73).kbyte(69));
fclose($printer);
$r_printer=fopen($device, 'r');
$ret=fgets($r_printer);
fclose($r_printer);
$bit_val=ord($ret[0]);
print "Retval=".$bit_val;
if(($bit_val & 12) || ($bit_val & 96))
print "******Out of paper******\n";
else
print "---Paper ok\n";
function kbyte($num) {
return pack('C', $num);
}
?>
于 2010-05-12T15:56:53.483 回答