One more update. "tempfile.TemporaryFile()" in not needed.
def __call__(self, value):
import Image
import cgi
try:
im = Image.open(value.file)
print im.size, im.format
im.thumbnail((100, 100), Image.ANTIALIAS)
value.file.seek(0)
im.save(value.file, im.format)
value.file.seek(0)
return (value, None)
except Exception as e:
print 'resize exception:', e
return (value, self.error_message)
On 2 zář, 12:34, kachna <petr.marti...@gmail.com> wrote:
> Thanks for hint.
> Here is my working solution. It takes lot of time.
>
> def __call__(self, value):
>
> import Image
> import cgi
> import tempfile
>
> try:
> im = Image.open(value.file)
> print im.size, im.format
>
> im.thumbnail((100, 100), Image.ANTIALIAS)
>
> resized = tempfile.TemporaryFile()
>
> im.save(resized, im.format)
>
> value.file = resized
> value.file.seek(0)
>
> return (value, None)
> except Exception as e:
> print 'resize exception:', e
> return (value, self.error_message)
>
> - In-value in __call__ is just one Field of cgi.FieldStorage. Here is
> upload filed. In value.file is open file with uploaded data.
> - Final image is stored in tempfile.TemporaryFile(). It must be
> rewind before return!
> - __call__ return Field of cgi.FieldStorage with new value.file
>
> On 1 zář, 23:25, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
>
>
> > This is a bit more complex than it seems because upload expects a
> > ci.FieldStorage object so the validator __call__ should return a
> > cgi.FieldStoarge.
>
> > On Sep 1, 3:50 pm, kachna <petr.marti...@gmail.com> wrote:
>
> > > Hi,
> > > I am trying to write validator to resize my image before storing in DB
> > > field.
>
> > > class RESIZE_IMG(object):
> > > def __init__(self, isThumb=False, error_message='unresizable'):
> > > (self.isThumb, self.error_message) = (isThumb,
> > > error_message)
>
> > > def __call__(self, value):
> > > import Image
>
> > > try:
>
> > > im = Image.open(value.file)
> > > # This print is OK. PIL recognize uploaded image
> > > print im.size, im.format
>
> > > im.resize((100, 100))
> > > value.file.seek(0)
> > > im.save(value.file, im.format)
> > > return (value, None)
> > > except Exception as e:
> > > print 'resize exception:', e
> > > return (value, self.error_message)
>
> > > Script runs well but data in DB field is no image data. It can' t be
> > > displayed by download function from default controller too.
>
> > > Thanks for help.
