[reportlab-users] too many open files with inline images

[Volker Haas]

I get an error (too many open files) when using lots of inline images 
inside paragraphs.

Sample code:

from reportlab.platypus.paragraph import Paragraph
from reportlab.platypus.doctemplate import SimpleDocTemplate
from reportlab.lib.styles import ParagraphStyle

import os
doc = SimpleDocTemplate('test.pdf')
elements = []

for count in range(1024):
    print len(os.listdir("/proc/%d/fd" % os.getpid()))
    p = Paragraph('text <img src="math2.png" width="2cm" height="0.5cm" 
/>' , ParagraphStyle('Normal'))
    elements.append(p)
doc.build(elements)

OUTPUT:

Traceback (most recent call last):
  File "test_fd.py", line 13, in <module>
OSError: [Errno 24] Too many open files: '/proc/32336/fd'

If the print statement is omitted (which isn't really platform 
independent ;)) I get an IOError (IOError: Cannot open resource 
"math.png" fileName=math.png) . But I am pretty sure this only happens 
because no new file handle could be aquired. The sample code works if 
less images are used (my machines limit for open file handles is 1024 
per process).
I am not attaching the sample image, b/c the sample code behaves in the 
same way when the image file is not existent.

Regards,
Volker

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