從數據存儲中檢索圖像時出現此錯誤

我已將圖像存儲在blob字段中。我試圖讓它顯示錯誤的圖像。

下面我粘貼了我的代碼和輸出。

main.py

import cgi 
import webapp2 
from google.appengine.api import users 
from google.appengine.ext.webapp.template \ 
    import render 
from os import path 
from google.appengine.ext import db 
from google.appengine.api import images 
import urllib 
import re 
import datetime 



class imgstore(db.Model): 
    name=db.StringProperty(multiline=True, default='') 
    image=db.BlobProperty() 


class MainHandler(webapp2.RequestHandler): 
    def get(self): 
     moviequery=db.GqlQuery('SELECT * FROM imgstore') 
     context={ 
       'list':moviequery 
       } 
     tmpl = path.join(path.dirname(__file__), 'static/html/index.html') 
     self.response.out.write(render(tmpl, context)) 

    def post(self): 
     name1 =images.resize(self.request.get("file"), 32, 32) 
     formdata = db.Blob(name1) 
     insert = imgstore() 
     insert.name="name" 
     insert.image=formdata 
     insert.put() 


routes=[ 
     (r'/', MainHandler), 
     ] 
app = webapp2.WSGIApplication(routes=routes,debug=True)

的index.html

> <html> 
>  <head><title>test</title></head> 
>  <body>hello 
>  <form id="form" action="/" method="post" ENCTYPE="multipart/form-data"> 
>   <input type="file" name="file" > 
>   <input type="submit" name="submit"> 
>  </form> 
>  {% for lis in list%} 
>  <img src="{{lis.image}}"> 
>  {% endfor %} 
>  </body> 
>   </html>

輸出

Traceback (most recent call last): 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1536, in __call__ 
    rv = self.handle_exception(request, response, e) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1530, in __call__ 
    rv = self.router.dispatch(request, response) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1278, in default_dispatcher 
    return route.handler_adapter(request, response) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 1102, in __call__ 
    return handler.dispatch() 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 572, in dispatch 
    return self.handle_exception(e, self.app.debug) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2.py", line 570, in dispatch 
    return method(*args, **kwargs) 
    File "/Users/saravase/test/main.py", line 44, in get 
    self.response.out.write(render(tmpl, context)) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/template.py", line 92, in render 
    return t.render(Context(template_dict)) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/template.py", line 172, in wrap_render 
    return orig_render(context) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 173, in render 
    return self._render(context) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 167, in _render 
    return self.nodelist.render(context) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 794, in render 
    bits.append(self.render_node(node, context)) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 807, in render_node 
    return node.render(context) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/defaulttags.py", line 173, in render 
    nodelist.append(node.render(context)) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 847, in render 
    return _render_value_in_context(output, context) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/template/__init__.py", line 827, in _render_value_in_context 
    value = force_unicode(value) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/_internal/django/utils/encoding.py", line 88, in force_unicode 
    raise DjangoUnicodeDecodeError(s, *e.args) 
DjangoUnicodeDecodeError: 'utf8' codec can't decode byte 0x89 in position 0: invalid start byte. 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請指導我如何進一步進行。

來源

2012-07-25 Saravanan

你把二進制圖像數據轉換成一個'IMG的'src'屬性'標記，而不是圖片的網址。這...不是HTML如何工作的。 – geoffspear 2012-07-25 13:48:13

查看問題的答案http://stackoverflow.com/questions/11475717/unicodedecodeerror-while-rendering-the-blob-image/11476250#11476250。這是完全一樣的問題。 – 2012-07-25 13:51:12

你需要做兩件事。首先，您需要更改HTML，以使img標籤的src包含由您的應用程序提供的URL。其次，你需要實現一個處理程序來服務URL。

比方說，你的應用程序將成爲具有這樣的URL存儲圖像：/image/15其中15是imgstore實體id。你需要添加路由：

routes=[ 
     (r'/image/(\d+)', ImageHandler), 
     (r'/', MainHandler), 
     ] 
app = webapp2.WSGIApplication(routes=routes,debug=True)

然後你就需要添加一個新的RequestHandler類：

class ImageHandler(webapp2.RequestHandler): 
    def get(self, image_id): 
     requestedImage = imgstore.get_by_id(int(image_id)) 
     if requestedImage is not None: 
      self.response.out.write(requestedImage.image) 
     else: 
      # return a default image when we can't located the 
      # one that was requested?

新航線包括數字捕獲 - (\d+) - 將作爲參數傳遞給請求處理程序。然後，我們可以使用該ID直接從數據存儲獲取圖像實體;它比使用查詢要快得多。

那麼，我們從哪裏得到ID？數據存儲中的每個實體都會自動分配一個整數ID，除非在存儲時爲其指定一個ID或名稱。

您需要做的最後一件事是提供一種簡單的方法，將用於將圖像服務器的URL嵌入到包含img標記的模板中。一個方法添加到您的imgstore類：

class imgstore(db.Model): 
    name=db.StringProperty(multiline=True, default='') 
    image=db.BlobProperty() 

    def url_for(self): 
     return "/image/%d" % self.id

現在你可以改變你的模板的新方法：

<img src="{{lis.url_for}}">

來源

2012-07-25 14:31:34

嘿...謝謝你的回覆.. – Saravanan 2012-07-26 04:01:30

它的工作... :-) – Saravanan 2012-07-26 04:01:47

很高興聽到它，@薩拉萬。如果它解決了你的問題，請隨時接受這個答案。 – 2012-07-26 15:32:57

從數據存儲中檢索圖像時出現此錯誤

回答

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