我目前正在使用Raspberry Pi进行一个简单的项目。我有一个简单的Apache 2服务器运行，有MySQL和很少的PHP / HTML页面。其中一个页面是下面的一个名为barcode.php的页面。在barcode.php上，在user_id字段中输入User_ID，然后按Enter或按查找按钮，它将在数据库中搜索该用户并显示该用户信息和图片。
以上所有工作都是通过扫描QR码手动甚至使用条形码扫描仪。现在，我想整合RFID阅读器（RFID READER RC522）。当用户在阅读器上扫描他/她的卡时，我希望它像条形码扫描器一样工作，并在user_id字段中输入数字代码，然后按回车键，这样页面就可以返回用户数据。
我对此很新。我怎样才能将它实现到我的barcode.php中？用户扫描的位置，并将其放在user_id字段上。
这是barcode.php：
<?php
// Initialize the variables
$user_id = "";
$osha = "";
$firstname = "";
$lastname = "";
$company = "";
$trade = "";
$email = "";
$picture = "";
$reg_date = "";
// PHP code to search data in a MySQL database and set it in input text
if(isset($_POST['search']))
{
// Connect to MySQL
$dbc = mysqli_connect("127.0.0.1", "root", "1234", "demodb");
// id to search
$user_id = mysqli_real_escape_string($dbc, $_POST['user_id']);
$query = "SELECT * FROM Users WHERE user_id = '$user_id' LIMIT 1";
$rs = mysqli_query($dbc, $query);
if (mysqli_num_rows($rs) == 1)
{
$row = mysqli_fetch_array($rs);
$osha = $row['osha'];
$firstname = $row['firstname'];
$lastname = $row['lastname'];
$company = $row['company'];
$trade = $row['trade'];
$email = $row['email'];
$picture = $row['picture'];
$reg_date = $row['reg_date'];
$query1 = "INSERT INTO scan (user_id, osha, firstname, lastname, company, trade, email, picture) VALUES (" .
"'" . $user_id . "'," .
"'" . mysqli_real_escape_string($dbc, $osha ) . "', " .
"'" . mysqli_real_escape_string($dbc, $firstname) . "', " .
"'" . mysqli_real_escape_string($dbc, $lastname ) . "', " .
"'" . mysqli_real_escape_string($dbc, $company ) . "', " .
"'" . mysqli_real_escape_string($dbc, $trade ) . "', " .
"'" . mysqli_real_escape_string($dbc, $email ) . "', " .
"'" . mysqli_real_escape_string($dbc, $picture ) . "')";
mysqli_query($dbc, $query1);
}
else
{
echo "Undefined ID";
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>User Search</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--===============================================================================================-->
<link rel="icon" type="image/png" href="images/icons/favicon.ico"/>
<!--===============================================================================================-->
<link rel="stylesheet" type="text/css" href="vendor/bootstrap/css/bootstrap.min.css">
<!--===============================================================================================-->
<link rel="stylesheet" type="text/css" href="fonts/font-awesome-4.7.0/css/font-awesome.min.css">
<!--===============================================================================================-->
<link rel="stylesheet" type="text/css" href="vendor/animate/animate.css">
<!--===============================================================================================-->
<link rel="stylesheet" type="text/css" href="vendor/css-hamburgers/hamburgers.min.css">
<!--===============================================================================================-->
<link rel="stylesheet" type="text/css" href="vendor/select2/select2.min.css">
<!--===============================================================================================-->
<link rel="stylesheet" type="text/css" href="css/util.css">
<link rel="stylesheet" type="text/css" href="css/main.css">
<!--===============================================================================================-->
<style>
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
}
</style>
</head>
<body>
<div class="contact1">
<div class="container-contact1">
<div class="contact1-pic js-tilt" data-tilt>
<?php echo "<img src= '$picture' height='400' width='400' alt='Image not found' onerror=this.onerror=null;this.src='images/scanbarcode.png'; >" ?>
</div>
<form action="barcode.php" method="post">
<div class="wrap-input1 validate-input" data-validate = "SCAN ID TO SEARCH">
<input class="input1" type="text" name="user_id" placeholder="SCAN ID TO SEARCH" autofocus>
<span class="shadow-input1"></span>
</div>
<div class="wrap-input1 validate-input" >
<input class="input1" type="text" name="osha" placeholder="OSHA #" value="<?= htmlspecialchars($osha) ?>">
<span class="shadow-input1"></span>
</div>
<div class="wrap-input1 validate-input" >
<input class="input1" type="text" name="firstname" placeholder="First Name" value="<?= htmlspecialchars($firstname) ?>">
<span class="shadow-input1"></span>
</div>
<div class="wrap-input1 validate-input" >
<input class="input1" type="text" name="lastname" placeholder="Last Name" value="<?= htmlspecialchars($lastname) ?>">
<span class="shadow-input1"></span>
</div>
<div class="wrap-input1 validate-input" >
<input class="input1" type="text" name="company" placeholder="Company Name" value="<?= htmlspecialchars($company) ?>">
<span class="shadow-input1"></span>
</div>
<div class="wrap-input1 validate-input" >
<input class="input1" type="text" name="trade" placeholder="Trade Name" value="<?= htmlspecialchars($trade) ?>">
<span class="shadow-input1"></span>
</div>
<input type="button" onclick="window.location='auth.php'" class="button" value="Admin"/>
<input type="submit" name="search" value="Find" class="button" >
</form>
</div>
</div>
<!--===============================================================================================-->
<script src="vendor/jquery/jquery-3.2.1.min.js"></script>
<!--===============================================================================================-->
<script src="vendor/bootstrap/js/popper.js"></script>
<script src="vendor/bootstrap/js/bootstrap.min.js"></script>
<!--===============================================================================================-->
<script src="vendor/select2/select2.min.js"></script>
<!--===============================================================================================-->
<script src="vendor/tilt/tilt.jquery.min.js"></script>
<script >
$('.js-tilt').tilt({
scale: 1.1
})
</script>
</body>
</html>
这是一个名为Read.py的简单Python脚本
#!/usr/bin/env python
import RPi.GPIO as GPIO
import SimpleMFRC522
import MFRC522
import signal
continue_reading = True
reader = SimpleMFRC522.SimpleMFRC522()
def end_read(signal,frame):
print "Ctrl+C captured, ending read."
continue_reading = False
GPIO.cleanup()
signal.signal(signal.SIGINT, end_read)
MIFAREReader = MFRC522.MFRC522()
while continue_reading:
id, text = reader.read()
print(id)
print(text)
在终端上，扫描卡时会返回以下数据：
pi@raspberrypi:/var/www/html/app/RFID/SPI-Py/MFRC522-python $ sudo python Read1.py
140248588882
我想将数字数据（140248588882）发送到barcode.php页面的user_id字段。我怎么能做到这一点？
答案 0 :(得分：1)
您需要客户端将文本打入Web浏览器，这不是PHP问题。
通常条形码扫描器将充当HID，因此它似乎输入数字并在您扫描某物的任何地方按下输入。您可以插入充当HID的alernate RFID阅读器，或者从python模拟键盘事件。
答案 1 :(得分：0)
这是一个快速入侵，但你可以创建一个这样的PHP页面：
<?php
print `sudo python Read1.py`;
然后在主PHP页面中使用JavaScript来轮询该PHP脚本，如果/当它返回有效ID时，将其插入输入并提交表单。
你应该这样做，以便Read1.py可以在没有sudo的情况下运行（让PHP能够运行无密码的sudo是一个安全问题）。
您还需要处理轮询超时的情况，在这种情况下，JavaScript应该再次轮询。
答案 2 :(得分：0)
您的问题是您需要一个Python文件才能将条形码发送到PHP脚本。
在Python脚本中添加以下代码：
DWORD nNumberOfBytesRead;
...
if (ReadFile(file, lpBuffer, nNumberOfBytesToRead-1, &nNumberOfBytesRead, NULL))
但是，您需要在barcode.php中将from webbrowser import open as start_webpage
...
...
...
...
if barcode_scanned:
start_webpage(url + "?user_id=" + str(barcode))
作为GET参数：
user_id