Question

捕获错误不能正常工作！

我想要做的是检测用户是否上传了真实图片或伪造的（例如，文本文件重命名为.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")

以下是http://localhost:8000/erreur-im

中显示的taceball

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。

当我将self.redirect更改为self.write("please upload....")时，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，我想self.redirect这里有一些奇怪的事情，因为self.write在捕获异常之后会对代码产生影响（实际上由于文本文件而无法识别image.size） .`

Answer 1

此回溯表明您正在重定向到一个代码，该代码在两个位置再次抛出未捕获的异常。请参阅：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":[]}

查看两个追溯：

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出错。

此外，您还有一个look at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。

捕获龙卷风中的PIL异常

1 个答案: