Re: [Discuss-gnuradio] Question about adding your own classes

[Martin Braun (CEL)]

Hi Tommy,

is this a visibility issue? Did you use modtool to add the additional
classes? If not, do you have a FOO_API macro in your class def?

MB


On Fri, Sep 20, 2013 at 01:58:16PM -0400, Tommy Tracy II wrote:
> Dear List,
> 
> 
> I am using gr_modtool to create new modules and blocks, and I have a question
> about adding additional .cc/.h files that are not included by gr_modtool to 
> the
> cmake file or otherwise importing them by hand.
> 
> 
> My new blocks are dependent on two new classes called NetworkInterface.{cc,h}
> and EthernetConnector.{cc,h}. During the make process, if there is a syntax
> error in either of these files, the compiler will alert me. I was able to fix
> all problems and get the cmake, make, and make install completed. The problem
> manifested itself when I attempted to import the module:
> 
> ----------
> 
> >>> import router
> 
> Traceback (most recent call last):
> 
>   File "<stdin>", line 1, in <module>
> 
>   File 
> "/home/tjt7a/Src/target/lib/python2.7/dist-packages/router/__init__.py",
> line 45, in <module>
> 
>     from router_swig import *
> 
>   File "/home/tjt7a/Src/target/lib/python2.7/dist-packages/router/
> router_swig.py", line 26, in <module>
> 
>     _router_swig = swig_import_helper()
> 
>   File "/home/tjt7a/Src/target/lib/python2.7/dist-packages/router/
> router_swig.py", line 22, in swig_import_helper
> 
>     _mod = imp.load_module('_router_swig', fp, pathname, description)
> 
> ImportError: /home/tjt7a/Src/target/lib/libgnuradio-router.so: undefined
> symbol: _ZN16NetworkInterface7connectEPc
> 
> ----------
> 
> To investigate the definition of this symbol, I ran c++filt
> 
> ----------
> 
> $c++filt _ZN16NetworkInterface7connectEPc
> 
> NetworkInterface::connect(char*)
> 
> ----------
> 
> This indicates, that my libgnuradio-router module cannot access the
> NetworkInterface object file, even though it was part of the compilation step.
> 
> 
> My thought process was to create the two shared object (.so) files by hand, 
> and
> move them to my python path location. So I did that:
> 
> ----------
> 
> cc -shared -o libEthernetConnector.so -fPIC EthernetConnector.cc 
> 
> cc -shared -o libNetworkInterface.so -fPIC NetworkInterface.cc 
> 
> I then copied them to the location of my gnuradio .so files
> 
> ----------
> 
> 
> Unfortunately, this still hasn't solved the problem. Does anyone know a
> solution to this problem?
> 
> 
> Tommy James Tracy II
> 
> Ph.D Student
> 
> High Performance Low Power Lab
> 
> University of Virginia
> 
> Phone: 913-775-2241
> 
> 

> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio


-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu

KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

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