J Kenneth King wrote:
Robert Kern <[EMAIL PROTECTED]> writes:
Philip Semanchuk wrote:
On Oct 23, 2008, at 11:36 AM, J Kenneth King wrote:
Hey everyone,
I'm working on a python extension wrapper around Rob Hess'
implementation of a SIFT feature detector. I'm working on a
computer-vision based project that requires interfacing with Python at
the higher layers, so I figured the best way to handle this would be in
C (since my initial implementation in python was ungodly and slow).
I can get distutils to compile the extension and install it in the
python path, but when I go to import it I get the wonderful exception:
ImportError: /usr/lib/python2.5/site-packages/pysift.so: undefined
symbol: _sift_features
Kenneth,
You're close but not interpreting the error quite correctly. This
isn't an error from the compiler or preprocessor, it's a library
error. Assuming this is dynamically linked, your OS is reporting
that, at runtime, it can't find the library that contains
_sift_features. Make sure that it's somewhere where your OS can find
it.
It looks like the library implementing it was not linked into the
extension. sift_features() is not part of OpenCV.
James, are you including the source of Rob Hess's implementation with
your extension, or are you trying to link against an already installed
version of the library? If the former, you need to add the C sources
to the pysift Extension(). If the latter, you need to add the name of
the library to the list of libraries.
I'm including Rob Hess' sources with the extension.
Would that mean I should add library_dirs to Extension() to point to the
sources in the project's path?
No, you would add the source file names to the sources= list.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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