UnicodeDecodeError在/api/image/处发生的原因是什么？

huangapple
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英文:

Why coming this error: UnicodeDecodeError at /api/image/

问题

我的目标是在响应中显示图像的URL，但它不起作用。我遇到了错误。这里实际上是否可以返回 request.data.get('img')？你能否给我一个解决方案？

serializer.py:

  1. class ImageSerializer(serializers.Serializer):
  2.     img = serializers.ImageField(required=False)

views.py:

  1. class ImageView(APIView):
  2.     def post(self, request):
  3.         serializer = ImageSerializer(data=request.data)
  4.         return Response(
  5.             {
  6.                 "processed_image_data": request.data.get('img')
  7.             }, 
  8.             status=status.HTTP_200_OK
  9.         )

errors:

  1. UnicodeDecodeError at /api/image/
  2. 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
  3. ...
英文:

My goal is to show the image's URL in response but it's not working. I getting errors. Here actually is it possible to return request.data.get('img')? Can you please give me a solution?

serializer.py:

  1. class ImageSerializer(serializers.Serializer):
  2.     img = serializers.ImageField(required=False)

views.py:

  1. class ImageView(APIView):
  2.    def post(self, request):
  3.         serializer = ImageSerializer(data=request.data)
  4.         return Response(
  5.             {
  6.                 "processed_image_data": request.data.get('img')
  7.             }, 
  8.             status=status.HTTP_200_OK
  9.         )

errors:

  1. UnicodeDecodeError at /api/image/
  2. 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
  3. Request Method:	POST
  4. Request URL:	http://127.0.0.1:8000/api/image/
  5. Django Version:	4.2
  6. Exception Type:	UnicodeDecodeError
  7. Exception Value:	
  8. 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
  9. Exception Location:	D:_Spondon-Bhai_Image-Process\venv\lib\site-packages\rest_framework\utils\encoders.py, line 50, in default
  10. Raised during:	app.views.ImageView
  11. Python Executable:	D:_Spondon-Bhai_Image-Process\venv\Scripts\python.exe
  12. Python Version:	3.9.5
  13. Python Path:	
  14. ['D:\_Spondon-Bhai\_Image-Process',
  15.  'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39\\python39.zip',
  16.  'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39\\DLLs',
  17.  'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39\\lib',
  18.  'c:\\users\\dcl\\appdata\\local\\programs\\python\\python39',
  19.  'D:\_Spondon-Bhai\_Image-Process\\venv',
  20.  'D:\_Spondon-Bhai\_Image-Process\\venv\\lib\\site-packages']
  21. Server time:	Wed, 19 Apr 2023 17:23:42 +0000
  22. Unicode error hint
  23. The string that could not be encoded/decoded was: ����
  25. Traceback Switch to copy-and-paste view
  26. D:_Spondon-Bhai_Image-Process\venv\lib\site-packages\django\core\handlers\exception.py, line 55, in inner
  27.         return inner
  28.     else:
  29.         @wraps(get_response)
  30.         def inner(request):
  31.             try:
  32.                 response = get_response(request) …
  33.             except Exception as exc:
  34.                 response = response_for_exception(request, exc)
  35.             return response
  36.         return inner
  37. Local vars
  38. D:_Spondon-Bhai_Image-Process\venv\lib\site-packages\django\core\handlers\base.py, line 220, in _get_response
  39.                 self.check_response(
  40.                     response,
  41.                     middleware_method,
  42.                     name="%s.process_template_response"
  43.                     % (middleware_method.__self__.__class__.__name__,),
  44.                 )
  45.             try:
  46.                 response = response.render() …
  47.             except Exception as e:
  48.                 response = self.process_exception_by_middleware(e, request)
  49.                 if response is None:
  50.                     raise
  51.         return response
  52. Local vars

答案1

得分: 1

你遇到的问题是因为响应数据包含二进制图像数据，无法直接包含在JSON响应中。相反，你应该将图像数据转换为可包含在JSON响应中的格式，如base64。你可以尝试以下方式：

  1. import base64
  2. from rest_framework.parsers import MultiPartParser
  4. class ImageView(APIView):
  5.     parser_classes = (MultiPartParser,)
  7.     def post(self, request):
  8.         serializer = ImageSerializer(data=request.data)
  9.         if serializer.is_valid():
  10.             img = serializer.validated_data.get('img')
  11.             img_format = img.image.format.lower()
  12.             img_data = img.read()
  13.             base64_img_data = base64.b64encode(img_data).decode('utf-8')
  14.             return Response(
  15.                 {
  16.                     "processed_image_data": f"data:image/{img_format};base64,{base64_img_data}"
  17.                 }, 
  18.                 status=status.HTTP_200_OK
  19.             )
  20.         else:
  21.             return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
英文:

The issue you're encountering is because the response data contains binary image data, which cannot be directly included in a JSON response. Instead, you should convert the image data to a format that can be included in a JSON response, such as base64. You can try something as follows

  1. import base64
  2. from rest_framework.parsers import MultiPartParser
  4. class ImageView(APIView):
  5.     parser_classes = (MultiPartParser,)
  7.     def post(self, request):
  8.         serializer = ImageSerializer(data=request.data)
  9.         if serializer.is_valid():
  10.             img = serializer.validated_data.get('img')
  11.             img_format = img.image.format.lower()
  12.             img_data = img.read()
  13.             base64_img_data = base64.b64encode(img_data).decode('utf-8')
  14.             return Response(
  15.                 {
  16.                     "processed_image_data": f"data:image/{img_format};base64,{base64_img_data}"
  17.                 }, 
  18.                 status=status.HTTP_200_OK
  19.             )
  20.         else:
  21.             return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

huangapple
  • 本文由 发表于 2023年4月20日 01:00:18
  • 转载请务必保留本文链接：https://go.coder-hub.com/76057093.html
  • django
  • django-rest-framework
  • serialization
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