保存上傳的base64數據會導致TypeError：需要類似字節的對象，而不是'str'

我正在使用JavaScript庫上傳圖像。它將圖像數據放置在表單字段中，該表單字段是具有文件名和base64編碼數據的JSON編碼對象。保存上傳的base64數據會導致TypeError：需要類似字節的對象，而不是'str'

當我嘗試保存瓶的形象，我得到這個錯誤：

builtins.TypeError TypeError: a bytes-like object is required, not 'str'

圖像文件與正確的名稱創建的，但數據已損壞，無法打開它。如何保存上傳的數據？

app = Flask(__name__) 
UPLOAD_FOLDER = app.root_path + '/images/' 

@app.route('/', methods=['GET', 'POST']) 
def index(): 
    if request.method == 'POST': 
     image_base = json.loads(request.form['file'])['output']['image'] 
     image_base = image_base[image_base.find(',')+1:] 
     file_data = io.StringIO(image_base) 
     file = FileStorage(file_data, filename=json.loads(from_form)['output']['name']) 
     filename = secure_filename(file.filename) 
     file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename)) 
     return redirect(url_for('uploaded_file', filename=filename)) 

    return render_template('index.html', methods=['GET', 'POST'])

File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1836, in __call__ 
    return self.wsgi_app(environ, start_response) 
    File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1820, in wsgi_app 
    response = self.make_response(self.handle_exception(e)) 
    File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1403, in handle_exception 
    reraise(exc_type, exc_value, tb) 
    File "/usr/local/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise 
    raise value 
    File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1817, in wsgi_app 
    response = self.full_dispatch_request() 
    File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1477, in full_dispatch_request 
    rv = self.handle_user_exception(e) 
    File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1381, in handle_user_exception 
    reraise(exc_type, exc_value, tb) 
    File "/usr/local/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise 
    raise value 
    File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1475, in full_dispatch_request 
    rv = self.dispatch_request() 
    File "/usr/local/lib/python3.5/site-packages/flask/app.py", line 1461, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
    File "/Users/kr/PycharmProjects/instaup/instaup.py", line 32, in index 
    file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename)) 
    File "/usr/local/lib/python3.5/site-packages/werkzeug/datastructures.py", line 2656, in save 
    copyfileobj(self.stream, dst, buffer_size) 
    File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/shutil.py", line 76, in copyfileobj 
    fdst.write(buf) 
TypeError: a bytes-like object is required, not 'str'

來源

2017-04-10 Konstantin Rusanov

StringIO代表一個字符串，而不是字節，你想要BytesIO。 Base64編碼的數據不是實際的圖像字節，需要使用b64decode進行解碼。

file_data = io.BytesIO(b64decode(image_base))

來源

2017-04-10 15:48:02 davidism

-1

你需要編碼或者app.config['UPLOAD_FOLDER']或filename是一個像字節對象。嘗試.encode('utf-8')方法。

來源

2017-04-10 15:11:57 Alex

如果添加爲它的一個，得到這個：類型錯誤：無法在路徑組件混合字符串和字節，如果雙方如果得到這個：AttributeError的：「字節」對象有沒有屬性「寫」 –

'UPLOAD_FOLDER'應該是（也是）一個字符串，但這不是問題。 – davidism

保存上傳的base64數據會導致TypeError：需要類似字節的對象，而不是'str'

回答

相關問題