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捕捉错误不会部分起作用！

我要做的是检测用户上传的是真实图片还是伪造图片（例如重命名为的文本文件.jpeg）。

try:
    image = Image.open(StringIO.StringIO(buf=avat))
    type = image.format
    (x, y) = image.size
    print x, y
    if x < y:
        orientation = "portrait"
    else:
        orientation = "paysage" 
    pref = str(time.time())
    nomf = pref.replace(".", "") 
    nomfich = nomf+"."+type
    self.fs = GridFS(self.db)
    avatar_id = self.fs.put(avat, content_type=avctype, filename=nomfich)
except IOError, TypeError:
    self.redirect("/erreur-im")

这是显示在http://localhost:8000/erreur-im

Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\tornado-2.3.post1-py2.7.egg\tornado\web.py", line 1023, in _execute
    getattr(self, self.request.method.lower())(*args, **kwargs)
  File "G:\Mon projet\sog-emouk\handlers.py", line 101, in get
    avctype = self.db.users.find_one()["avctype"]
TypeError: 'NoneType' object has no attribute '__getitem__'

在这里，我想做的是将用户重定向到一个页面，告诉他们用户必须使用图片图片。

当我改变结果self.redirect时self.write("please upload....")，结果很奇怪：

Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\tornado-2.3.post1-py2.7.egg\tornado\web.py", line 1023, in _execute
    getattr(self, self.request.method.lower())(*args, **kwargs)
  File "G:\Mon projet\sog-emouk\handlers.py", line 153, in post
    user={"pseudo":pseudo, "orientation":orientation, "avctype":avctype, "password":password, "email":email, "tel":tel, "commune":commune, "coord":coord, "statut":statut, "telf":telf, "avatar":avatar_id, "acheteur":[], "vendeur":[]}
UnboundLocalError: local variable 'orientation' referenced before assignment

所以，我猜self.redirect这里有一些奇怪的地方，因为self.write在捕获异常后执行代码（实际上由于文本文件，image.size 不知道）。`

4

1 回答 1

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此回溯表明您正在重定向到在两个地方再次抛出未捕获异常的代码。看到这个：avctype = self.db.users.find_one()["avctype"]和

user={"pseudo":pseudo, "orientation":orientation, "avctype":avctype, "password":password, "email":email, "tel":tel, "commune":commune, "coord":coord, "statut":statut, "telf":telf, "avatar":avatar_id, "acheteur":[], "vendeur":[]}

查看两个回溯：

Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\tornado-2.3.post1-py2.7.egg\tornado\web.py", line 1023, in _execute
    getattr(self, self.request.method.lower())(*args, **kwargs)
  File "G:\Mon projet\sog-emouk\handlers.py", line 101, in get
    avctype = self.db.users.find_one()["avctype"]
TypeError: 'NoneType' object has no attribute '__getitem__'

和

Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\tornado-2.3.post1-py2.7.egg\tornado\web.py", line 1023, in _execute
    getattr(self, self.request.method.lower())(*args, **kwargs)
  File "G:\Mon projet\sog-emouk\handlers.py", line 153, in post
    user={"pseudo":pseudo, "orientation":orientation, "avctype":avctype, "password":password, "email":email, "tel":tel, "commune":commune, "coord":coord, "statut":statut, "telf":telf, "avatar":avatar_id, "acheteur":[], "vendeur":[]}
UnboundLocalError: local variable 'orientation' referenced before assignment

因此，我认为您在初始化应用程序和请求处理程序的应用程序中存在错误。

此外，您还可以查看 如何检查文件是否实际上是 jpeg。事实上，您可以检查其他媒体文件格式 avi、rm 等检查前四个字符。

于 2012-08-18T19:23:56.193 回答