Re: [Discuss-gnuradio] Question on how to derive a class in an out-of-tree module based on a gnuradio class

[Marcus Müller]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

.... I should pay closer attention; sorry!

On 07.10.2014 11:16, Martin Braun wrote:
> On 10/07/2014 09:54 AM, Marcus Müller wrote:
>> This looks like a linker error. In your main CMakeList.txt, you
>> have to add DIGITAL to the line containing
>> 
>> set(GR_REQUIRED_COMPONENTS ...
> 
> The OP mentioned he'd already done that, but I still agree with
> your suspicion. It's actually more likely some SWIG/linking issue.
> 
> Are you referencing the correct header files in your SWIG file?
> 
> M
> 
> 
> 
> 
>> If you already have that, sometimes make clean helps, when for
>> some reason linker/ccache/black magic involving CMake failed.
>> 
>> Greetings, Marcus
>> 
>> On 07.10.2014 03:58, Zhe Feng wrote:
>>> Dear all,
>>> 
>>> I'm trying to derive a *packet_header2* class in my own OOT
>>> module based on *gr::digital::packet_header_default*. I
>>> followed the way in *packet_heade_ofdm*  of gr-digital and made
>>> packet_header2.h and packet_header2.cc in my own OOT module.
>>> 
>>> But when I tried to import my_oot in python, it returned an
>>> undefined symbol error like this:
>>> 
>>> Traceback (most recent call last): File "<stdin>", line 1, in
>>> <module> File
>>> "/usr/local/lib/python2.7/dist-packages/my_oot/__init__.py",
>>> line 45, in <module> from my_oot_swig import * File
>>> "/usr/local/lib/python2.7/dist-packages/my_oot/my_oot_cdma.py",
>>> line 26, in <module> _my_oot_swig = swig_import_helper() File
>>> "/usr/local/lib/python2.7/dist-packages/cdma/cdma_swig.py",
>>> line 22, in swig_import_helper _mod =
>>> imp.load_module('_my_oot_swig', fp, pathname, description) 
>>> ImportError: /usr/local/lib/libgnuradio-my_oot.so: undefined
>>> symbol: _ZTIN2gr7digital21packet_header_defaultE
>>> 
>>> I searched the list and found a previous answered question
>>> below 
>>> http://gnuradio.4.n7.nabble.com/so-undefined-symbol-ZN2gr6blocks12count-bits16E-td46270.html
>>>
>>>
>>> 
where Marcus suggested editing the CMakeList.txt files by adding the module
>>> I needed. So I added
>>> 
>>> *set(GR_REQUIRED_COMPONENTS RUNTIME DIGITAL)*  in
>>> CMakeLists.txt.
>>> 
>>> and then. This above error disappeared when I import my_oot
>>> again in python. But this problem isn't solved. I tried to
>>> access some functions of packet_header_default like formatter
>>> and base, it returned me an AtrributeError like this:
>>> 
>>> AttributeError: 'packet_header2_sptr' object has no attribute
>>> 'formatter', which means the packet_header2 wasn't really a
>>> derived class of packet_header_default.
>>> 
>>> I confirmed my conjecture by checking the 
>>> /usr/local/lib/python2.7/dist-packages/my_oot/my_oot_swig.py
>>> where the classes are stored in python.  I found that the class
>>> packet_header2 is defined as *class packet_header2(object)*. So
>>> the packet_header2 *isn't* installed as a derived class of
>>> *gr::digital::packet_header_default*.  what I expected was
>>> *packet_header2(gr::digital::packet_header_default)*.
>>> 
>>> So I'm asking you that how to correctly derive my class (eg: 
>>> packet_header2) in my own oot module based on a class (eg: 
>>> packet_header_default) in an existing module (eg: gr-digital)?
>>> 
>>> My packet_header2.h and packet_header2.cc are attached for your
>>> reference.
>>> 
>>> Thanks! Best, Zhe
>>> 
>>> 
>>> 
>>> _______________________________________________ 
>>> Discuss-gnuradio mailing list address@hidden 
>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> 
>> 
>> 
>> _______________________________________________ Discuss-gnuradio
>> mailing list address@hidden 
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> 
> 
> 
> _______________________________________________ Discuss-gnuradio
> mailing list address@hidden 
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAEBAgAGBQJUM7IEAAoJEAFxB7BbsDrLiX8H/3gPnytHZ8+TLDJb4zWSj2yR
mn8do7lA7QmuKU5sPq9xUbUyvaN+HhzJFiap1wYop/N7rVP5VESzPFoLrcci23RR
/zfjy+pMyHw4WudpjpBVB0laSwQR6+SjyiKZEl0O/wlWxoTWSGOx5Q18YfOdW/i5
xWWTn9XDU5gmNnPNZElowyIEyG6yy7rpha8lIjzdaV6V5kPdNcw8nopOx4P5gb+z
eUUAF0Z/3UCq5Og7u95hHA2F17hhh1aVy2yTYMU3JA/KpcUq/qk58K50AbS/Ycaw
miFV5hKpMne/AxIPnEIlL2EVwpirGIjgTAbk6vbMfmIz0I5QBPeZDA6fYF4Bk70=
=pGV9
-----END PGP SIGNATURE-----