python - 从 txt 文件中获取行并显示在 python 网络服务器上
问题描述
我正在尝试在树莓派上组装一个带有温度传感器的鸟箱相机。我找到了一段很棒的代码来运行网络服务器来显示相机图像。(https://randomnerdtutorials.com/video-streaming-with-raspberry-pi-camera/)
我已经连接了温度传感器,可以读取值并将其保存到文本文件中。我现在想读取该文本文件并将内容(即温度)插入页面,但我不知道如何!有没有一种简单的 Python 方法可以做到这一点?
来自 randomnerdtutorials.com 的代码
# Web streaming example
# Source code from the official PiCamera package
# http://picamera.readthedocs.io/en/latest/recipes2.html#web-streaming
import io
import picamera
import logging
import socketserver
from threading import Condition
from http import server
PAGE="""\
<html>
<head>
<title>Raspberry Pi - Surveillance Camera</title>
</head>
<body>
<center><h1>Raspberry Pi - Surveillance Camera</h1></center>
<center><img src="stream.mjpg" width="640" height="480"></center>
</body>
</html>
"""
class StreamingOutput(object):
def __init__(self):
self.frame = None
self.buffer = io.BytesIO()
self.condition = Condition()
def write(self, buf):
if buf.startswith(b'\xff\xd8'):
# New frame, copy the existing buffer's content and notify all
# clients it's available
self.buffer.truncate()
with self.condition:
self.frame = self.buffer.getvalue()
self.condition.notify_all()
self.buffer.seek(0)
return self.buffer.write(buf)
class StreamingHandler(server.BaseHTTPRequestHandler):
def do_GET(self):
if self.path == '/':
self.send_response(301)
self.send_header('Location', '/index.html')
self.end_headers()
elif self.path == '/index.html':
content = PAGE.encode('utf-8')
self.send_response(200)
self.send_header('Content-Type', 'text/html')
self.send_header('Content-Length', len(content))
self.end_headers()
self.wfile.write(content)
elif self.path == '/stream.mjpg':
self.send_response(200)
self.send_header('Age', 0)
self.send_header('Cache-Control', 'no-cache, private')
self.send_header('Pragma', 'no-cache')
self.send_header('Content-Type', 'multipart/x-mixed-replace; boundary=FRAME')
self.end_headers()
try:
while True:
with output.condition:
output.condition.wait()
frame = output.frame
self.wfile.write(b'--FRAME\r\n')
self.send_header('Content-Type', 'image/jpeg')
self.send_header('Content-Length', len(frame))
self.end_headers()
self.wfile.write(frame)
self.wfile.write(b'\r\n')
except Exception as e:
logging.warning(
'Removed streaming client %s: %s',
self.client_address, str(e))
else:
self.send_error(404)
self.end_headers()
class StreamingServer(socketserver.ThreadingMixIn, server.HTTPServer):
allow_reuse_address = True
daemon_threads = True
with picamera.PiCamera(resolution='640x480', framerate=24) as camera:
output = StreamingOutput()
#Uncomment the next line to change your Pi's Camera rotation (in degrees)
#camera.rotation = 90
camera.start_recording(output, format='mjpeg')
try:
address = ('', 8000)
server = StreamingServer(address, StreamingHandler)
server.serve_forever()
finally:
camera.stop_recording()
解决方案
推荐阅读
- reactjs - Firebase - 在发送到云 Firestore 时保存临时数据
- google-drive-api - 在 Javascript 客户端中从 Google Drive 下载文件
- javascript - 将数组数组转换为对象数组
- javascript - 使用 Ajax javascript 从 API 请求中获取错误消息
- javascript - 在文本框中显示 NaN 的函数
- excel - 粘贴到下一个空列
- cucumber - 如何在黄瓜 4.0 中通过类型注册表添加数据表
- c++ - DCGAN for RGB 数据集奇怪的结果
- react-native - 如何使用 Animated.Value 作为比例尺?
- amazon-web-services - ssh 进入胶水开发端点,因为 hadoop 用户 `File '/var/aws/emr/userData.json' cannot be read`