Author coderforlife
Recipients coderforlife
Date 2013-01-04.21:28:18
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Message-id <1357334898.38.0.395259266999.issue16865@psf.upfronthosting.co.za>
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The environment is Windows 8 Pro 64-bit running Python 64-bit in the WinPython distribution. Python is v2.7.3 built on Apr 10 2012. I first found this with create_string_buffer however I found out that it happens with an even simpler example.

The following code throws an AttributeException: class must define a _length_ attribute, which must be a positive integer.

import ctypes
c_char * int(2*1024*1024*1024) # 2GB, also fails with long() instead of int()

However the following works

import ctypes
c_char * int(2*1024*1024*1024-1) # 1 byte less than 2GB


This is the same with the other c_ types (not limited to size of memory since c_int * int(2*1024*1024*1024-1) works and would be nearly 4 times the size of the failed c_char one).
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Date User Action Args
2013-01-04 21:28:18coderforlifesetrecipients: + coderforlife
2013-01-04 21:28:18coderforlifesetmessageid: <1357334898.38.0.395259266999.issue16865@psf.upfronthosting.co.za>
2013-01-04 21:28:18coderforlifelinkissue16865 messages
2013-01-04 21:28:18coderforlifecreate