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YAHOO.Shortcuts.document_title = "Automatic DLL loading behavior";
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<!-- DIV {margin:0px;}-->Hello All,
Ihave a fairly straightforward script that attempts to connect to a webserver
using https and retrieve some data which is then compared to afile retrieved
out of subversion. To do these tasks, my script isusing M2Crypto 0.18.2 and
PySVN 1.5.3-904. While these are onlyincidental to my problem, I thought it
worth including for background.
Ifin the script the import order is to load M2Crypto followed by PySVN,the
function call attempting to connect to the subversion fails withthe following
error:
"pysvn._pysvn_2_5.ClientError: PROPFIND request failed on '<svn path>'
PROPFIND of '<svn path>': SSL negotiation failed: SSL disabled due to library
version mismatch (https://typhon)"
IfI upgrade to Python 2.5.2 from 2.5.1, the python interpreter crasheswith a
fatal exception instead of throwing the exception listed above.
Now, if instead I import PySVN first before M2Crypto, then compilation of the
script fails with this exception:
"Traceback (most recent call last):
File "D:\programs\working\test.py", line 20, in <module>
import M2Crypto
File "C:\utils\Python25\Lib\site-packages\M2Crypto\__init__.py", line 14, in
<module>
import __m2crypto
ImportError: DLL load failed: The specified procedure could not be found."
Furtherresearch into this problem shows that M2Crypto and PySVN are
compiledagainst different versions of the OpenSSL dlls. I can't help butwonder
if this suggests a wider problem with how dlls are handled. Itmakes sense that
the Python VM would only want to load 1 copy of anydlls for memory and
performance reasons, but then it leaves problemslike this one. Maybe the only
'workaround' is to compile externalmodules for yourself rather than relying on
pre-built binaries. If youhave any information or advice for me, it would be
appreciated.
Thank you,
John Siegrist
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