不是一个有效的直接I / O文件描述符资源php

Question

我们正在尝试使用php从RFID读写，目前我们能够设置诸如波特率和优先级之类的东西，但无法写入RFID也无法从RFID读取

下面是我的php代码:

if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') 
{ 
    echo "hi Windows/n";
    $bbSerialPort = dio_open($portName, O_RDWR);
    if($bbSerialPort){
        dio_close($bbSerialPort);
    }
    exec("mode {$portName} baud={$baudRate} data={$bits} stop={$spotBit} parity=n xon=on");
    $bbSerialPort;
    echo '/nsuccessfull exec';
} 
if(!$bbSerialPort)
{
    echoFlush( "Could not open Serial port {$portName} ");
    exit;
}
$dataToReboot = pack("H*","0205F08A7E");
$bytesSent    = dio_write($bbSerialPort, $dataToReboot );
$runForSeconds = new DateInterval("PT5S"); //5 seconds
$endTime = (new DateTime())->add($runForSeconds);
echoFlush(  "Waiting for {$runForSeconds->format('%S')} seconds to recieve data on serial port" );
while (new DateTime() < $endTime) {
    $data = dio_read($bbSerialPort, 256); //this is a blocking call
    echo "<br>"."number";
    if ($data) {
        echoFlush(  "Data Recieved: ". $data );
    }
}
echoFlush(  "Closing Port" );
dio_close($bbSerialPort);

Answer 1

您在脚本顶部的$bbSerialPort上调用dio_close。也就是说，你关闭了与射频识别的连接。关闭连接后，您无法向它发送消息