如何在Django中从StreamingHttpResponse重定向

Question

我想实现这一目标：

1. 用户的脸是通过摄像头在主页
2. 中检测到的，应用程序获取用户的出勤率，用考勤细节
3. 显示网页考勤细节页面将在几秒钟后重定向回主页，摄像头仍在运行

。

到目前为止，我的应用程序能够接收用户的出勤率，但即使我使用了return ()，也不会将其呈现到考勤详细信息页面。它将留在主页上，摄像头仍在运行。有什么办法可以解决这个问题吗?还是我搞错了？我已经尝试过像这样手动更改请求细节，但是它不起作用。

request.resolver_match = resolve('/takeAttendance/')
        request.path='/takeAttendance/'
        request.path_info='/takeAttendance/'

一个类似于How to redirect to another url after detect face in django的问题，但没有一个答案对我有用。所涉及的代码如下：

views.py

from django.shortcuts import render, redirect
from django.contrib import messages
from django.http import HttpResponse , StreamingHttpResponse
from datetime import datetime, date
import cv2
import face_recognition
import numpy as np
import threading

foundFace = False
vs = cv2.videoCapture(0)
lock = threading.Lock()
frame = None

def videoFeed(request):
        return StreamingHttpResponse(getFace(request),content_type="multipart/x-mixed-replace;boundary=frame")

def getFace(request):
    global vs,outputFrame,lock,foundFace
    known_face_names,known_face_encodings = getFiles() # get the image files from my project directory
    face_location = []
    face_encoding = []
    while foundFace==False:
        check,frame = vs.read()
        small_frame = cv2.resize(frame,(0,0),fx=0.5,fy=0.5)
        face_roi = small_frame[:,:,::-1]
        face_location = face_recognition.face_locations(face_roi)
        face_encoding = face_recognition.face_encodings(face_roi,face_location)
        face_names = []
        names=[]
        for encoding in face_encoding:
            matches = face_recognition.compare_faces(known_face_encodings,np.array(encoding),tolerance=0.6)
            distances = face_recognition.face_distance(known_face_encodings,encoding)
            matches = face_recognition.compare_faces(known_face_encodings,np.array(encoding),tolerance=0.6)
            distances = face_recognition.face_distance(known_face_encodings,encoding)
            best_match_index = np.argmin(distances) 

            if matches[best_match_index]:
                name = known_face_names[best_match_index]
                face_names.append(name)
                if name not in names:
                    names.append(name)
        #process the frame (add text and rectangle, add the name of the identified user to names)
        with lock:
            (flag,encodedImg) = cv2.imencode(".jpg",frame)
            
        if len(names)!=0:
            foundFace=True
        if foundFace==True:
            takeAttendance(request,names)
            foundFace==False
        yield(b'--frame\r\n' b'Content-Type: image/jpeg\r\n\r\n' + 
            bytearray(encodedImg) + b'\r\n')

def takeAttendance(request,names):
    context={}
    if request.method=='GET':
        if user_id in names:
            attendance = Attendance(user_ID = str(user_id),
                                            date_in = date.today(),
                                            time_in = datetime.now())
            attendance.save()
            context={'attendance':attendance}
            messages.success(request,'Check in successful')
            return render(request,'Attendance/attendance.html',context)
        else:
            messages.error(request,'Check in failed')
            return redirect('home')
    else:
        return redirect('home')

urls.py

from django.urls import path
from . import views
urlpatterns=[
    path('home/',views.home,name='home'),
    path('takeAttendance/',views.takeAttendance,name='takeAttendance'),
    path('videoFeed/',views.videoFeed,name='videoFeed'),

]

我正在使用Django 3.1，我对它非常陌生，谢谢！

编辑

实际上，我想重定向到Attendance.html，但是保持视频流运行，就像在循环中一样，这样我就可以用Javascript从Attendance.html重定向到摄像头页面，并且仍然运行视频流。抱歉没说清楚。

Answer 1

哦..。为什么我没注意到..。

问题是：

...
        if foundFace==True:
            takeAttendance(request,names)
...

是的，您执行在getFace中返回呈现输出的函数。仅此而已，getFace根本不使用返回值。

正确的代码应该是：

...
        if foundFace==True:
            returned_render = takeAttendance(request,names)
            return returned_render
...

或者简单地说：

...
        if foundFace==True:
            return takeAttendance(request,names)
            # or maybe you should use yield instead of return?
            # I don't know. Check both
            yield takeAttendance(request,names)
...