[ros-users] Python node design.

[Blaise Gassend]

If you move pyopencv into src, you should be able to import from
python after loading the manifest, by using "import
pyopencv.module_name". (Though I am not 100% sure, given that I don't
know exactly what is in pyopencv.)

I'm curious, however, what pyopencv is, and how it differs from the
opencv2 package. http://www.ros.org/wiki/opencv2

2010/11/2 Renato Samperio <mintaka_alnitak at hotmail.com>:
> Dar ROS users,
>
> I would like to know if somebody could have a hint for our problem. This
> question is for system design in python.
>
> We require of a ROS package holding a library for our system that has
> relevant python wrappers (pyopencv) used in our system.
>
> So far, we have encapsulated all required libraries (*.so) and python files
> (*.py) into a node structure which can be used by pointing it to the
> LD_LIBRARY_PATH. However, if we want to run our system as a ROS node, we
> also require to update this system variable.
>
> The 'manifest.xml' file for our ROS library (pyopencv) is:
>
> <package>
>
> <description brief="pyopencv"> pyopencv </description>
>
> <author>Renato Samperio</author>
>
> <license>BSD</license>
>
> <review status="unreviewed" notes=""/>
>
> <url>http://ros.org/wiki/pyopencv</url>
>
> <depend package="rospy"/>
>
> <depend package="sensor_msgs"/>
>
> <export>
>
> <cpp lflags="-Wl,-rpath,${prefix}/lib -L${prefix}/lib -lpyopencv_extras
> -lboost_python -lcvaux -lcv_h_ext -lcv_hpp_ext -lcxcore_h_ext
> -lcxcore_hpp_ext -lcxcore_hpp_point_ext -lcxcore_hpp_vec_ext -lcxtypes_h_ext
> -lhighgui_ext -lcvaux -lcv -lcxcore -lhighgui -lml -lml_ext -lsdopencv_ext"
> />
>
> </export>
>
> </package>
>
> We made our node following rules from PyStyleGuide. Our file system
> structure is:
>
> pyopencv
>
> |- CMakeLists.txt
>
> |- manifest.xml
>
> |- mainpage.dox
>
> |- src/
>
> |- pyopencv/ ← Pointed to LD_LIBRARY_PATH
>
> |- __init__.py
>
> |- *.so, *.py, *.pyc
>
> I would really appreciate if somebody has an idea of how we could avoid the
> LD_LIBRARY_PATH system variable.
>
> With best wishes,
>
> Renato Samperio
>
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