Help needed with hacking through SWIG / Python / custom block

GNU Radio
1

Hi all,

I’m trying a sort of a ‘hack’, but it doesn’t work so far. What I want
to do is to add a method to the class in my custom block, and make this
method available in Python (the top_block.py). Without knowledge of SWIG
I just tried the following things (where ZZZ is the name of my block):

  1. Add the method protoype to ZZZ.h
  2. Add the method protoype to ZZZ_impl.h
  3. Implement the method in ZZZ_impl.cc
  4. Empty the build/swig folder to force a swig rebuild
  5. Run make again

When running top_block.py I get the following errors (apparently my goal
is not that simple):

Traceback (most recent call last):
File “top_block_modified.py”, line 16, in
import TNO_JJJ_2014
File
“/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/init.py”, line
45, in
from TNO_JJJ_2014_swig import *
File
“/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/TNO_JJJ_2014_swig.py”,
line 28, in
_TNO_JJJ_2014_swig = swig_import_helper()
File
“/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/TNO_JJJ_2014_swig.py”,
line 24, in swig_import_helper
_mod = imp.load_module(’_TNO_JJJ_2014_swig’, fp, pathname,
description)
ImportError: /usr/local/lib/libgnuradio-TNO_JJJ_2014.so: undefined
symbol: _ZN3uhd14tune_request_tC1Ed

Make reported me before:

Install the project…
– Install configuration: “Release”
– Up-to-date:
/usr/local/lib/cmake/TNO_JJJ_2014/TNO_JJJ_2014Config.cmake
– Up-to-date: /usr/local/include/TNO_JJJ_2014/api.h
– Installing: /usr/local/include/TNO_JJJ_2014/JJJ_kernel.h
– Installing: /usr/local/lib/libgnuradio-TNO_JJJ_2014.so
– Installing:
/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/_TNO_JJJ_2014_swig.so
– Removed runtime path from
“/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/_TNO_JJJ_2014_swig.so”
– Installing:
/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/TNO_JJJ_2014_swig.py
– Installing:
/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/TNO_JJJ_2014_swig.pyc
– Installing:
/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/TNO_JJJ_2014_swig.pyo
– Up-to-date:
/usr/local/include/TNO_JJJ_2014/TNO_JJJ_2014/swig/TNO_JJJ_2014_swig.i
– Installing:
/usr/local/include/TNO_JJJ_2014/TNO_JJJ_2014/swig/TNO_JJJ_2014_swig_doc.i
– Up-to-date:
/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/init.py
– Up-to-date:
/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/init.pyc
– Up-to-date:
/usr/local/lib/python2.7/dist-packages/TNO_JJJ_2014/init.pyo
– Up-to-date:
/usr/local/share/gnuradio/grc/blocks/TNO_JJJ_2014_JJJ_kernel.xml

Anybody knows what I have to add/change to get this working? Maybe
something in the init.py file? If so, how do I generate the
corresponding .pyc and .pyo files?

Best regards,

Jeroen

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