[Zope] PIL: can't call same method twice

[Tino Wildenhain]

Am Sonntag, den 06.03.2005, 14:28 +0100 schrieb Chris:
> Hi Dieter,
> 
> >   Almost surely, your first call moved the file pointer to
> >   the end and the second one does not find content.
> > 
> >   You can use the "seek" method to reposition the file pointer.
> 
> That is, what I thought, too. So I added in PIL.Image.py (Version 1.1.4)
> in line 1548 "fp.seek(0)" to "rewind" the file object (see below) to no
> avail. So I guess I am not in the right place. But I will dig into the
> PIL code soon.
> Thanx for pointing me in the right direction.
> Regards Chris


You dont have to change PIL code. Just use Parser instead
of the Image object directly.

import PIL.ImageFile
parser=PIL.ImageFile.Parser()

chunksize=8192

yourfile.seek(0)
chunk=yourfile.read(chunksize)

while chunk:
    parser.feed(chunk)
    chunk=yourfile.read(chunksize)

img=parser.close()

...


after the first chunk you feed in, parser.image can contain 
data of your image, so you can read width and height