我试图停止一个无限的while循环，该循环使用yield函数传递来自相机供稿的帧，但是如果在识别过程中在相机中识别出正确的人，则还会传递一个确认标签(“确认”)。因此，我写了一个if语句，它检查检查是否等于“notfound”，如果是，则表示它是一个人，在此示例中，我需要重定向到某个位置-主页。
from flask import Flask, render_template, Response, redirect, url_for
import cv2
import numpy as np
from camera2 import VideoCamera
app = Flask(__name__)
light_on = False
@app.route('/', methods=['GET', 'POST'])
@app.route('/home', methods=['GET', 'POST'])
def home():
return render_template("main.html")
@app.route('/recognition', methods=['GET', 'POST'])
def recognition():
return render_template('recognition.html')
def gen(camera2):
while True:
confirmation, frame = camera2.get_frame()
print(confirmation)
# yield ('--frame\r\nContent-Type: image/jpeg\r\n\r\n' + frame + '\r\n\r\n')
yield (b'--frame\r\n'
b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n\r\n')
if confirmation != "notfound":
return redirect(url_for("home"))
@app.route('/video_feed')
def video_feed():
return Response(gen(VideoCamera()),
mimetype='multipart/x-mixed-replace; boundary=frame')
if __name__ == '__main__':
app.run("localhost", 5050, debug=True, threaded=True)
但是每当我尝试这样做时，我都会收到错误消息:
"Attempted to generate a URL without the application context being"
RuntimeError: Attempted to generate a URL without the application context being pushed. This has to be executed when application context is available.
我将不胜感激任何帮助或建议!
谢谢!
最佳答案
我有一个类似的问题，这可能会帮助一些人...
from functools import wraps
def my_decorator(function):
@wraps(function)
def wrapper():
if not os.path.isdir(audioPath):
return ""
return function()
return wrapper
@app.route('/playaudio')
@my_decorator # this avoid infinity loop
def playaudio():
def generate():
data = ""
if os.path.isdir(audioPath):
for audioPath in filesAudios:
data=subprocess.check_output(['cat',audioPath])
yield data # ifinity loop if audioPath do not exist
return data
return Response(generate(), mimetype='audio/mp3')
关于python - Python-使用yield停止无限循环，然后重定向，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60870615/