Opened 14 years ago

Last modified 5 years ago

#13750 closed

ImageField accessing height or width and then data results in "I/O operation on closed file" — at Initial Version

Reported by: ROsborne Owned by: nobody
Component: Documentation Version: dev
Severity: Normal Keywords:
Cc: Aksel Triage Stage: Ready for checkin
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

If you have a simple model with an ImageField, the following code will fail with a "I/O operation on closed file":

instance = MyClass.objects.get(...)
w = instance.image.width
h = instance.image.height
original = Image.open(instance.image)

The work around is to reopen the file:

instance = MyClass.objects.get(...)
w = instance.image.width
h = instance.image.height
instance.image.open()
original = Image.open(instance.image)

Note this is different than the issue of the 2nd read() returning empty strings for two reasons:

  1. You can not seek(0), the file is closed.
  2. Needing to reopen in this case is unexpected.

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