[Zope] External Method limits

[Lee Harr]

Hi:

I am working through the section of the Zope Book on External Methods 
(chapter 8: Advanced Zope Scripting -- 
http://www.zope.org/Members/michel/ZB/ScriptingZope.dtml -- Secton: Using 
External Methods)

There is an example there which uses PIL that I am having some trouble with. 
Whenever I try to use makeThumbnail on a file which is more than about 60K I 
get the following error:


Error Type: TypeError
Error Value: expected string, ImplicitAcquirerWrapper found


with this traceback:



Traceback (innermost last):
File /usr/local/www/Zope/lib/python/ZPublisher/Publish.py, line 223, in 
publish_module
File /usr/local/www/Zope/lib/python/ZPublisher/Publish.py, line 187, in 
publish
File /usr/local/www/Zope/lib/python/Zope/__init__.py, line 221, in 
zpublisher_exception_hook
(Object: Traversable)
File /usr/local/www/Zope/lib/python/ZPublisher/Publish.py, line 171, in 
publish
File /usr/local/www/Zope/lib/python/ZPublisher/mapply.py, line 160, in 
mapply
(Object: makeThumbnail)
  File /usr/local/www/Zope/lib/python/ZPublisher/Publish.py, line 112, in 
call_object
(Object: makeThumbnail)
File 
/usr/local/www/Zope/lib/python/Products/ExternalMethod/ExternalMethod.py, 
line 262, in __call__
(Object: makeThumbnail)
(Info: ((<Folder instance at 8a4cf00>, '002_2.JPG', 128), {}, (128,)))
File /usr/local/www/Zope/Extensions/Thumbnail.py, line 18, in makeThumbnail
(Object: Traversable)
TypeError: (see above)


My sense is that I am either running in to limitations on how much 
processing an External Method is allowed to perform (which I do not believe) 
or else the cStringIO module uses a different approach with files of a 
certain size and PIL does not like it.

Any wisdom?



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