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

[Tom Rondeau]

On Fri, Sep 20, 2013 at 7:13 PM, Martin Braun (CEL)
<address@hidden> wrote:
> 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

Tommy,

Yes, make sure that the FOO_API is declared for the classes. Also, you
have to make sure they are being imported into the swig module
correctly in gr-foo/swig/foo_swig.i.

You can use gr_modtool with the class type "noblock" to create classes
that are not gr::blocks for this purpose, which will set up the cmake
and swig files correctly.


> 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
>
>
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> Communications Engineering Lab (CEL)
>
> Dipl.-Ing. Martin Braun
> Research Associate
>
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>
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>
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>
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-- 
Tom
GRCon13 Oct. 1 - 4
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