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RE: [igraph] plotting problem with python
From: |
Glenn Fulford |
Subject: |
RE: [igraph] plotting problem with python |
Date: |
Tue, 5 Oct 2010 15:50:08 +1000 |
Dear Tamas,
thanks very much for your suggestions. I beleive I eventiually tracked down the
problem.
I found the following web page very useful.
http://alex.matan.ca/install-cairo-wxpyton-pycairo-python-windows
First thing it told me was to append c:\Python26\Lib\site-packages\cairo to my
path, which I hadn't done, but this didn't fix the problem.
I then reinstalled the dll files, this time from the wxpythion site. Thiat
seemed to fix the problem. So not surre exactly which dll it was, but I can
compare themn if anyone is interested.
Glenn
Dr Glenn Fulford +61 7 313 85196 QUT Mathematical Sciences,
GPO Box 2343 Brisbane, Qld AUSTRALIA 4001. Cricos no. 00213J
email: address@hidden; address@hidden
calender:
http://www.google.com/calendar/embed?src=glenn.fulford%40gmail.com&ctz=Australia/Brisbane&mode=WEEK
skype: glenn.fulford msgr chat: address@hidden
________________________________________
From: address@hidden address@hidden On Behalf Of Tamas Nepusz address@hidden
Sent: Monday, 4 October 2010 8:39 PM
To: Help for igraph users
Subject: Re: [igraph] plotting problem with python
Dear Glenn,
It seems like the Python bindings of Cairo are not installed properly on
your machine -- igraph simply reports this when it says "plotting not
available".
I checked a working installation on Windows XP (32-bit) and the
following files should be present in
c:\python26\lib\site-packages\cairo:
__init__.py
_cairo.pyd
libcairo-2.dll
libexpat-1.dll
libfontconfig-1.dll
libpng14-14.dll
zlib1.dll
The error message you see means that Python finds __init__.py in the
cairo subfolder successfully, and it tries to import _cairo.pyd from
there. (.pyd files are like ordinary .dll files, Python just uses a
different extension to distinguish them from .dlls). Unfortunately the
import can fail for at least two reasons:
1) _cairo.pyd itself is missing
2) _cairo.pyd is there, but one of its dependencies is missing.
Unfortunately, the error message is the same in both cases. So, I'd do
the following:
1. Check whether all the files I mentioned above are in the
site-packages\cairo folder. If not, install them.
2. If they are all there, download Dependency Walker from
www.dependencywalker.com and open _cairo.pyd with it. Dependency Walker
should recursively traverse the dependency tree of _cairo.pyd and report
any other DLLs that you are missing.
--
Tamas
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