Hi everyone, I'm creating a custom header format *'header_format_cognitive*' derived from *'header_format_default*'. I'm adding extra info to the default header, very similar to the way the child class *'header_format_counter*' adds bits/symbol to the default. I'm creating my class as an OOT module named *'cognitiveSDR'*.
I'm running into what appears to be a common issue, with people previously creating spin-offs of *packet_header_default*, including gr-ieee-802.11. https://www.mail-archive.com/discuss-gnuradio@gnu.org/msg50789.html http://gnuradio.4.n7.nabble.com/Trouble-with-SWIG-for-packet-formatter-default-child-class-td52446.html I was able to compile, install and import my module in GRC, but once I try to create the class using a variable with "cognitiveSDR.header_format_cognitive(..........)", I get the message: *"Value "cognitiveSDR.header_format_cognitive(..........)" cannot be evaluated: 'module' object has no attribute 'header_format_cognitive'"* To give some context, normally when creating a standard header format object using a GRC variable I call *"digital.header_format_counter(preamble_b, 3, Const_PLD.bits_per_symbol())"* *Steps taken so far:* 1. Created my new module *cognitiveSDR* with gr_modtool 2. Added *header_format_cognitive* (c++) using gr_modtool as type 'noblock' 3. Fleshed out the .cc and .h files using a combination of *header_format_counter*, *header_format_crc* and my own functions 4. Made sure to *#include <gnuradio/digital/header_format_default.h>* in the header file 5. Used *digital::header_format_default* as the parent class in the class declaration since it's now in separate namespace to 'digital' 6. Modified *set(GR_REQUIRED_COMPONENTS RUNTIME DIGITAL)* in CMakeLists.txt 6. Modified the SWIG file as shown below Are there any modifications that I should make to the default CMakeLists.txt file generated for the module or additional changes to the SWIG file in order to make my class accessible inside GRC? I assume the parent and child classes are linking up properly since cmake, make and install succeed. Thanks for you help! Cheers. Justin *cognitiveSDR_swig.i* *-------------------------------------------------------------------------------------------------------------------* /* -*- c++ -*- */ #define COGNITIVESDR_API #define DIGITAL_API %include "gnuradio.i" // the common stuff //load generated python docstrings %include "cognitiveSDR_swig_doc.i" %{ #include "cognitiveSDR/header_format_cognitive.h" %} %include "gnuradio/digital/header_format_base.h" %include "gnuradio/digital/header_format_default.h" %include "cognitiveSDR/header_format_cognitive.h" %template(header_format_cognitive_sptr) boost::shared_ptr<gr::cognitiveSDR::header_format_cognitive>; %pythoncode %{ header_format_cognitive_sptr.__repr__ = lambda self: "<header_format_cognitive>" header_format_cognitive = header_format_cognitive .make; %}
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