Google App Engine（Python） - 上传文件（图片） [英] Google App Engine (Python) - Uploading a file (image)

问题描述

我希望用户能够将图片上传到Google App Engine。我有以下（Python）：

$ p $ class ImageData（ndb.Model）：
name = ndb.StringProperty（ indexed = False）
image = ndb.BlobProperty（）


信息由用户提交使用表单（HTML）：

 < form name =inputaction =/ registermethod =post > 
名称：< input type =textname =name> 
图片：< input type =filename =image> 
< / form> 
  

然后处理：

<$ p
imagedata = ImageData（parent = image_key（image_name））
imagedata.name = class AddProduct（webapp2.RequestHandler）：
def post（self） self.request.get（'name'）
imagedata.image = self.request.get（'image'）
imagedata.put（）


然而，当我尝试上传图片时，让我们说Book.png，我得到错误：
BadValueError ：期望的str，得到了u'Book.png'

任何想法是怎么回事？我一直在使用GAE很长一段时间，但这是我第一次使用blob。

我使用这个链接：https://developers.google.com/appengine/docs/python/images/usingimages
使用db，不是ndb。
我也尝试将图像存储在变量中，如链接：
storedInfo = self.request.get（'image'）
然后存储它：
imagedata.image = ndb.Blob（storedInfo）
这也给我一个错误：
AttributeError：'模块'对象没有属性'Blob'
提前致谢

解决方案

 <$ c 
 $ c> imagedata.image = self.request.get（'image'）
  

p>

  imagedata.image = str（self.request.get（'image'））
  

您的表单还需要enctype =multipart / form-data

 < form name =inputaction =/ registermethod =postenctype =multipart / form-data> 
  

I want the user to be able to upload images to Google App Engine. I have the following (Python):

class ImageData(ndb.Model):
     name = ndb.StringProperty(indexed=False)
     image = ndb.BlobProperty()

Information is submitted by the user using a form (HTML):

<form name = "input" action = "/register" method = "post">
    name: <input type = "text" name = "name">
    image: <input type = "file" name = "image">
</form>

Which is then processed by:

class AddProduct(webapp2.RequestHandler):
    def post(self):
        imagedata = ImageData(parent=image_key(image_name))
        imagedata.name = self.request.get('name')
        imagedata.image = self.request.get('image')
        imagedata.put()

However, when I try to upload an image, lets say "Book.png", I get the error: BadValueError: Expected str, got u'Book.png'

Any idea what is going on? I have been working with GAE for quite some time, but this is the first time I had to use blobs.

I used this link: https://developers.google.com/appengine/docs/python/images/usingimages which uses db, not ndb. I also tried storing the image in a variable first like in the link: storedInfo = self.request.get('image') and then storing it: imagedata.image = ndb.Blob(storedInfo) Which ALSO gives me an error: AttributeError: 'module' object has no attribute 'Blob' Thanks in advance.

解决方案

Had the same prob.

just replace

imagedata.image = self.request.get('image')

with:

imagedata.image = str(self.request.get('image'))

also your form needs to have enctype="multipart/form-data

<form name = "input" action = "/register" method = "post" enctype="multipart/form-data">

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