TypeError: expected bytes-like object, not str





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I know this question has been asked much times, but please look once in my problem.



I am sending base64 image data from angular to python flask but when I am processing that base64 data on flask server(python3) then it is giving me the error




TypeError: expected bytes-like object, not str




my Javascript code is:



window['__CANVAS'].toDataURL("image/png");



Output of the above line is:



"data:image/png;base64,iVBORw0KGgoAAAANSUhEUg....."



I am receiving same data on flask server as string.



Code on python server that is using above base 64 data is: 



def convert_to_image(base64_code):

  image_64_decode = base64.decodebytes(base64_code)

  image_result = open('baseimage.jpg', 'wb')

  image_result.write(image_64_decode)

  img_rgb = cv2.imread('baseimage.jpg')

  return img_rgb


then it is giving the following error trace:



File "/home/shubham/py-projects/DX/Web/app/base64toimage.py", line 10, in convert_to_image    

  image_64_decode = base64.decodebytes(base64_code)

File "/usr/lib/python3.5/base64.py", line 552, in decodebytes    

  _input_type_check(s)

File "/usr/lib/python3.5/base64.py", line 521, in _input_type_check  

  raise TypeError(msg) from err 

TypeError: expected bytes-like object, not str


above python function working fine if I am converting the image using this function



import base64



with open("t.png", "rb") as imageFile:

  str = base64.b64encode(imageFile.read())

  print str


please help me to solve this question? I am new to python.






javascript python base64 angular6







share|improve this question




















  • 1





    b64encode returns bytes, that's why decodebytes works, because it is expecting bytes, not a string (as the error message clearly states). See: docs.python.org/3/library/base64.html To solve your problem, convert base64_code to bytes or pass a byte-like-object to the function instead of a string. Side note: you have successfully overriden the built-in str with str = base64.b64encode(... - don't do that!

    – Mike Scotty
    Nov 16 '18 at 15:21




















2















I know this question has been asked much times, but please look once in my problem.



I am sending base64 image data from angular to python flask but when I am processing that base64 data on flask server(python3) then it is giving me the error




TypeError: expected bytes-like object, not str




my Javascript code is:



window['__CANVAS'].toDataURL("image/png");



Output of the above line is:



"data:image/png;base64,iVBORw0KGgoAAAANSUhEUg....."



I am receiving same data on flask server as string.



Code on python server that is using above base 64 data is: 



def convert_to_image(base64_code):

  image_64_decode = base64.decodebytes(base64_code)

  image_result = open('baseimage.jpg', 'wb')

  image_result.write(image_64_decode)

  img_rgb = cv2.imread('baseimage.jpg')

  return img_rgb


then it is giving the following error trace:



File "/home/shubham/py-projects/DX/Web/app/base64toimage.py", line 10, in convert_to_image    

  image_64_decode = base64.decodebytes(base64_code)

File "/usr/lib/python3.5/base64.py", line 552, in decodebytes    

  _input_type_check(s)

File "/usr/lib/python3.5/base64.py", line 521, in _input_type_check  

  raise TypeError(msg) from err 

TypeError: expected bytes-like object, not str


above python function working fine if I am converting the image using this function



import base64



with open("t.png", "rb") as imageFile:

  str = base64.b64encode(imageFile.read())

  print str


please help me to solve this question? I am new to python.






javascript python base64 angular6







share|improve this question




















  • 1





    b64encode returns bytes, that's why decodebytes works, because it is expecting bytes, not a string (as the error message clearly states). See: docs.python.org/3/library/base64.html To solve your problem, convert base64_code to bytes or pass a byte-like-object to the function instead of a string. Side note: you have successfully overriden the built-in str with str = base64.b64encode(... - don't do that!

    – Mike Scotty
    Nov 16 '18 at 15:21
















2












2








2








I know this question has been asked much times, but please look once in my problem.



I am sending base64 image data from angular to python flask but when I am processing that base64 data on flask server(python3) then it is giving me the error




TypeError: expected bytes-like object, not str




my Javascript code is:



window['__CANVAS'].toDataURL("image/png");



Output of the above line is:



"data:image/png;base64,iVBORw0KGgoAAAANSUhEUg....."



I am receiving same data on flask server as string.



Code on python server that is using above base 64 data is: 



def convert_to_image(base64_code):

  image_64_decode = base64.decodebytes(base64_code)

  image_result = open('baseimage.jpg', 'wb')

  image_result.write(image_64_decode)

  img_rgb = cv2.imread('baseimage.jpg')

  return img_rgb


then it is giving the following error trace:



File "/home/shubham/py-projects/DX/Web/app/base64toimage.py", line 10, in convert_to_image    

  image_64_decode = base64.decodebytes(base64_code)

File "/usr/lib/python3.5/base64.py", line 552, in decodebytes    

  _input_type_check(s)

File "/usr/lib/python3.5/base64.py", line 521, in _input_type_check  

  raise TypeError(msg) from err 

TypeError: expected bytes-like object, not str


above python function working fine if I am converting the image using this function



import base64



with open("t.png", "rb") as imageFile:

  str = base64.b64encode(imageFile.read())

  print str


please help me to solve this question? I am new to python.






javascript python base64 angular6







share|improve this question
















I know this question has been asked much times, but please look once in my problem.



I am sending base64 image data from angular to python flask but when I am processing that base64 data on flask server(python3) then it is giving me the error




TypeError: expected bytes-like object, not str




my Javascript code is:



window['__CANVAS'].toDataURL("image/png");



Output of the above line is:



"data:image/png;base64,iVBORw0KGgoAAAANSUhEUg....."



I am receiving same data on flask server as string.



Code on python server that is using above base 64 data is: 



def convert_to_image(base64_code):

  image_64_decode = base64.decodebytes(base64_code)

  image_result = open('baseimage.jpg', 'wb')

  image_result.write(image_64_decode)

  img_rgb = cv2.imread('baseimage.jpg')

  return img_rgb


then it is giving the following error trace:



File "/home/shubham/py-projects/DX/Web/app/base64toimage.py", line 10, in convert_to_image    

  image_64_decode = base64.decodebytes(base64_code)

File "/usr/lib/python3.5/base64.py", line 552, in decodebytes    

  _input_type_check(s)

File "/usr/lib/python3.5/base64.py", line 521, in _input_type_check  

  raise TypeError(msg) from err 

TypeError: expected bytes-like object, not str


above python function working fine if I am converting the image using this function



import base64



with open("t.png", "rb") as imageFile:

  str = base64.b64encode(imageFile.read())

  print str


please help me to solve this question? I am new to python.






javascript python base64 angular6




javascript python base64 angular6






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 16 '18 at 15:38









Idlehands

6,1631923




6,1631923










asked Nov 16 '18 at 15:17









Shubham BatraShubham Batra

1,31421337




1,31421337








  • 1





    b64encode returns bytes, that's why decodebytes works, because it is expecting bytes, not a string (as the error message clearly states). See: docs.python.org/3/library/base64.html To solve your problem, convert base64_code to bytes or pass a byte-like-object to the function instead of a string. Side note: you have successfully overriden the built-in str with str = base64.b64encode(... - don't do that!

    – Mike Scotty
    Nov 16 '18 at 15:21
















  • 1





    b64encode returns bytes, that's why decodebytes works, because it is expecting bytes, not a string (as the error message clearly states). See: docs.python.org/3/library/base64.html To solve your problem, convert base64_code to bytes or pass a byte-like-object to the function instead of a string. Side note: you have successfully overriden the built-in str with str = base64.b64encode(... - don't do that!

    – Mike Scotty
    Nov 16 '18 at 15:21










1




1





b64encode returns bytes, that's why decodebytes works, because it is expecting bytes, not a string (as the error message clearly states). See: docs.python.org/3/library/base64.html To solve your problem, convert base64_code to bytes or pass a byte-like-object to the function instead of a string. Side note: you have successfully overriden the built-in str with str = base64.b64encode(... - don't do that!

– Mike Scotty
Nov 16 '18 at 15:21







b64encode returns bytes, that's why decodebytes works, because it is expecting bytes, not a string (as the error message clearly states). See: docs.python.org/3/library/base64.html To solve your problem, convert base64_code to bytes or pass a byte-like-object to the function instead of a string. Side note: you have successfully overriden the built-in str with str = base64.b64encode(... - don't do that!

– Mike Scotty
Nov 16 '18 at 15:21














1 Answer
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base64.decodebytes only accepts byte arrays, use base64.b64decode instead it accepts Strings as well






share|improve this answer
























  • by changing this I am getting new error hsv_img = cv2.cvtColor(image,cv2.COLOR_BGR2HSV) cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

    – Shubham Batra
    Nov 16 '18 at 19:01











  • stackoverflow.com/a/33522724/5048815

    – wiomoc
    Nov 16 '18 at 23:25












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1 Answer
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1 Answer
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active

oldest

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active

oldest

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active

oldest

votes









0














base64.decodebytes only accepts byte arrays, use base64.b64decode instead it accepts Strings as well






share|improve this answer
























  • by changing this I am getting new error hsv_img = cv2.cvtColor(image,cv2.COLOR_BGR2HSV) cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

    – Shubham Batra
    Nov 16 '18 at 19:01











  • stackoverflow.com/a/33522724/5048815

    – wiomoc
    Nov 16 '18 at 23:25
















0














base64.decodebytes only accepts byte arrays, use base64.b64decode instead it accepts Strings as well






share|improve this answer
























  • by changing this I am getting new error hsv_img = cv2.cvtColor(image,cv2.COLOR_BGR2HSV) cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

    – Shubham Batra
    Nov 16 '18 at 19:01











  • stackoverflow.com/a/33522724/5048815

    – wiomoc
    Nov 16 '18 at 23:25














0












0








0







base64.decodebytes only accepts byte arrays, use base64.b64decode instead it accepts Strings as well






share|improve this answer













base64.decodebytes only accepts byte arrays, use base64.b64decode instead it accepts Strings as well







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 16 '18 at 15:27









wiomocwiomoc

487512




487512













  • by changing this I am getting new error hsv_img = cv2.cvtColor(image,cv2.COLOR_BGR2HSV) cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

    – Shubham Batra
    Nov 16 '18 at 19:01











  • stackoverflow.com/a/33522724/5048815

    – wiomoc
    Nov 16 '18 at 23:25



















  • by changing this I am getting new error hsv_img = cv2.cvtColor(image,cv2.COLOR_BGR2HSV) cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

    – Shubham Batra
    Nov 16 '18 at 19:01











  • stackoverflow.com/a/33522724/5048815

    – wiomoc
    Nov 16 '18 at 23:25

















by changing this I am getting new error hsv_img = cv2.cvtColor(image,cv2.COLOR_BGR2HSV) cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

– Shubham Batra
Nov 16 '18 at 19:01





by changing this I am getting new error hsv_img = cv2.cvtColor(image,cv2.COLOR_BGR2HSV) cv2.error: OpenCV(3.4.3) /io/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

– Shubham Batra
Nov 16 '18 at 19:01













stackoverflow.com/a/33522724/5048815

– wiomoc
Nov 16 '18 at 23:25





stackoverflow.com/a/33522724/5048815

– wiomoc
Nov 16 '18 at 23:25




















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