Hi,
Please give me pointers on how to debug this.
Basic form error:
"Upload a valid image. The file you uploaded was either not an image
or a corrupted image."
I have googled around and the problems I have read regards recompiling
jpeg for MAC after installing PIL. I have Windows, and so I believe
everything is bundled correctly.
I have a Windows XP box, Python 2.5, django 1.0, and Python Imaging
Library 1.1.6 for Python 2.5 (Windows only).
I have created a simple form with a browse and submit.
I upload a jpg file and the form keeps returning "Upload a valid
image. The file you uploaded was either not an image or a corrupted
image."
Now, I know PIL is working because in the shell, I can do this:
--------------------------------------------------------------
$ python manage.py shell
Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from PIL import Image
>>> im=Image.open("C:\\my_wsgi\\media\\photos\\name.jpg")
>>> print im.format
JPEG
>>>
--------------------------------------------------------------
In my google search efforts, one suggestion was to just change the
raise exception in fields.py (C:\Python25\Lib\site-packages\django
\forms):
class ImageField(FileField):
.
.
.
.
try:
# load() is the only method that can spot a truncated
JPEG,
# but it cannot be called sanely after verify()
trial_image = Image.open(file)
trial_image.load()
# Since we're about to use the file again we have to reset
the
# file object if possible.
if hasattr(file, 'reset'):
file.reset()
# verify() is the only method that can spot a corrupt PNG,
# but it must be called immediately after the constructor
trial_image = Image.open(file)
trial_image.verify()
except ImportError:
# Under PyPy, it is possible to import PIL. However, the
underlying
# _imaging C module isn't available, so an ImportError
will be
# raised. Catch and re-raise.
raise
except Exception: # Python Imaging Library doesn't recognize
it as an image
raise # << I comment the original below, and I just call
raise here >>>
#raise ValidationError(self.error_messages
['invalid_image'])
.
.
.
Having the raise bubble all the way up leads to:
TemplateSyntaxError at /upload_file/
Caught an exception while rendering: cannot identify image file
Original Traceback (most recent call last):
File "C:\Python25\lib\site-packages\django\template\debug.py", line
71, in render_node
result = node.render(context)
File "C:\Python25\lib\site-packages\django\template\defaulttags.py",
line 241, in render
value = bool_expr.resolve(context, True)
File "C:\Python25\lib\site-packages\django\template\__init__.py",
line 535, in resolve
obj = self.var.resolve(context)
File "C:\Python25\lib\site-packages\django\template\__init__.py",
line 676, in resolve
value = self._resolve_lookup(context)
File "C:\Python25\lib\site-packages\django\template\__init__.py",
line 705, in _resolve_lookup
current = getattr(current, bit)
File "C:\Python25\lib\site-packages\django\forms\forms.py", line
340, in _errors
return self.form.errors.get(self.name, self.form.error_class())
File "C:\Python25\lib\site-packages\django\forms\forms.py", line
111, in _get_errors
self.full_clean()
File "C:\Python25\lib\site-packages\django\forms\forms.py", line
229, in full_clean
value = field.clean(value, initial)
File "c:\Python25\lib\site-packages\django\forms\fields.py", line
505, in clean
trial_image = Image.open(file)
File "C:\Python25\Lib\site-packages\PIL\Image.py", line 1916, in
open
raise IOError("cannot identify image file")
IOError: cannot identify image file
--------------------------------------------------------------------
So, it seems that one of these two are failing in fields.py:
trial_image = Image.open(file)
trial_image.load()
Here is my question:
How do I find out what that 'file' is the Image object is trying to
open?
It would be nice if I can just put a print statement in between the
two, something like:
trial_image = Image.open(file)
print "here is the file you are loading: "+str(file)
trial_image.load()
But of course, that will not work.
I think that 'file' is pointing in the wrong place and hence, PIL
cannot find it.
P.S.
To make the debugging easier, I hardcoded the filename in my file
handler to ensure it gets copied in the right place:
def handle_uploaded_file(f):
out_file="C:\\my_wsgi\\media\\photos\\name.jpg"
destination = open(out_file, 'wb+')
for chunk in f.chunks():
destination.write(chunk)
destination.close()
And I do see the file in c:\my_wsgi\media\photos directory, and so I
know that chunks are writtern successfully.
So, please, what's a good debugging method for me to capture to what
that 'file' is pointing?
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