Raspberry Pi的PHP / HTML通讯
[英]PHP/HTML Communication for Raspberry Pi
问题描述
I am very novice in this field of programing so any guidance would be appreciated. 
我是程序设计领域的新手，因此可以提供任何指导。 I have a camera stream for my Rasp Pi and I just attached a servo to turn it around. 我的Rasp Pi有一个摄像头流，我刚刚连接了一个伺服器以将其转过来。 I have broken down my problem into three stages. 我将问题分为三个阶段。
1) HTML GUI for a simple two button, with a value box for camera degrees. 1）HTML GUI，用于简单的两个按钮，并带有用于摄影度的值框。
2) PHP scrip to read the value each time a button is pressed in html and write it down to a text file. 2）PHP脚本以每次在html中按下按钮时读取值并将其写入文本文件。
3) Python script that reads the text file and moves the camera accordingly. 3）读取文本文件并相应移动相机的Python脚本。
I have completed step 3 which is to turn the servo around. 我已经完成了第3步，即将伺服系统调转。 I also made a small GUI as step 1 in html. 我还制作了一个小的GUI，作为html中的第1步。 My major concern is to link a client side html page to a php server side. 我主要关心的是将客户端html页面链接到php服务器端。 My expertise end right here. 我的专长到此结束。 I have a website hosted on my Pi so all I want is to be able to control the cameras position through a simple web page. 我在Pi上托管了一个网站，因此我所希望的就是能够通过一个简单的网页控制摄像机的位置。 Is there a simple way for html to talk to php? 有没有简单的方法可以让html与php对话？ I can write a simple php code to write value to a text file if I can initially get data from the html button. 如果最初可以从html按钮获取数据，我可以编写一个简单的php代码将值写入文本文件。
And to be exact, the button wont be passing an actual number, just an increment/decrement signal to the php where a hardcoded value with increase or decrease(Camera angle in degrees). 确切地说，按钮不会传递实际的数字，只是传递给php的增量/减量信号，而其中的硬编码值会增加或减少（相机角度，以度为单位）。
Here is my code so far. 到目前为止，这是我的代码。
<!doctype html>
<html>
<head>
<title>Camera Control</title>
</head>
<body>
<h1 style="text-align: center;">Camera Control</h1>
<p style="text-align: center;">
<input name="Leftbutton" type="button" value="Left" />
<input maxlength="5" name="textbox" size="5" type="text" />
<input name="Rightbutton" type="button" value="Right" />
</p>
</body>
</html>
<?php
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = " **Some value from the button, text or number** \n";
fwrite($myfile, $txt);
fclose($myfile);
?>
My goal is to avoid JavaScript or languages that I don't know, if there is a simple easy way I can get this done would be amazing. 我的目标是避免使用JavaScript或我不知道的语言，如果有一种简单的简便方法可以实现这一目标，那就太好了。 Thanks in advance. 提前致谢。
2 个解决方案
解决方案1
0 2017-09-25 17:20:32
This code below should be index.php: 下面的代码应为index.php：
<?php
if($_GET['return'] == 'failed'){
echo '<p>unable to execute command.<p>';
}
?>
<style>
#camera > input{
margin-left 10px;
}
</style>
<form id="camera" action="camera.php" method="post">
<input type="submit" name="left" value="left">
<input maxlength="5" name="textbox" size="5" type="text" />
<input type="submit" name="right" value="right">
</form>
Then for the PHP something like this: 然后对于PHP来说是这样的：
<?php
#camera.php
if(isset($t = $_POST['textbox']) && isset($l = $_POST['left']) || isset($r = $_POST['right'])){
if(isset($l){
$v = "left";
} elseif(isset($r)) {
$v = "right";
} else {
header('Location: ./index.php?return="failed"');
die();
}
if(!file_put_contents('data.txt', time() . "| $v:$t" . PHP_EOL)){
header('Location: ./index.php?return="failed"');
die();
}
header('Location: ./index.php');
// if access to shell
exec('python ./location/to/yourscript.py');
}
?>
解决方案2
0 2017-09-28 00:49:50
<html>
<head>
<title>PHP Test Page
</title>
</head>
<body>
<form method="post" action="temp.php">
<input type="submit" value="Left" name="leftb">
<input type="submit" value="Right" name="rightb">
</form>
</body>
</html>
<?php
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
if ($_POST['leftb'])
{ echo "Left is pressed";
$txt = -1;}
else if ($_POST['rightb'])
{ echo "Right is pressed";
$txt = 1;}
fwrite($myfile, $txt);
fclose($myfile);
sleep(1);
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = 0;
fwrite($myfile, $txt);
fclose($myfile);
?>
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