From: discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org [mailto:discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org] On Behalf Of Nowlan, Sean Sent: Monday, February 23, 2015 3:10 PM To: discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] Trouble with SWIG for packet_formatter_default child class
Hi all - I'm working on Tom's packet_handling branch (github.com/trondeau/gnuradio.git) and building a custom packet formatter. Everything works in C++ land, including QA code. However, SWIG is complaining about undeclared things. I duplicated the CMake and SWIG structures of gnuradio/gr-digital/swig/ for building derived classes such as gr::digital::packet_formatter_counter. Any ideas why this would not work? Thanks! ---- first few lines of make errors ---- /home/me/code/gr-myoot/build/swig/myoot_swigPYTHON_wrap.cxx: In function 'PyObject* _wrap_packet_formatter_custom_make(PyObject*, PyObject*, PyObject*)': /home/me/code/gr-myoot/build/swig/myoot_swigPYTHON_wrap.cxx:5030:3: error: 'sptr' was not declared in this scope sptr result; ^ /home/me/code/gr-myoot/build/swig/myoot_swigPYTHON_wrap.cxx:5030:8: error: expected ';' before 'result' sptr result; ^ /home/me/code/gr-myoot/build/swig/myoot_swigPYTHON_wrap.cxx:5062:7: error: 'result' was not declared in this scope result = gr::myoot::packet_formatter_custom::make((std::string const &)*arg1,(std::string const &)*arg2,arg3); ^ ---- gr-myoot/swig/myoot_swig.i ---- /* -*- c++ -*- */ #define MYOOT_API %include "gnuradio.i" // the common stuff //load generated python docstrings %include "myoot_swig_doc.i" %{ #include "myoot/packet_formatter_custom.h" %} %include "myoot/packet_formatter_custom.h" GR_SWIG_BLOCK_MAGIC2(myoot, packet_formatter_custom); // Properly package up non-block objects %include "packet_formatter_custom.i" ---- gr-myoot/swig/packet_formatter_custom.i ---- %template(packet_formatter_custom_sptr) boost::shared_ptr<gr::myoot::packet_formatter_custom>; %pythoncode %{ packet_formatter_custom_sptr.__repr__ = lambda self: "<packet_formatter_custom>" packet_formatter_custom = packet_formatter_custom .make; %} ------------------------------------------ To get it to build, I added the following typedef to gr-myoot/include/myoot/packet_formatter_custom.h : ... public: typedef boost:shared_ptr<packet_formatter_custom> sptr; ... Now importing SWIG-generated stuff in Python fails: >>> import myoot Traceback (most recent call last): File "<input>", line 1, in <module> File "/home/me/target/lib/python2.7/dist-packages/myoot/__init__.py", line 29, in <module> from myoot_swig import * File "/home/me/target/lib/python2.7/dist-packages/myoot/myoot_swig.py", line 265, in <module> packet_formatter_custom = packet_formatter_custom .make; AttributeError: 'function' object has no attribute 'make' This is probably due to a conflict between the definition of sptr: one is being autogenerated by SWIG based on the typedef in include/myoot/packet_formatter_custom.h; the other is the template in swig/packet_formatter_custom.i. Now if I build without the special sauce in swig/packet_formatter_custom.i, I can get "import myoot" in Python to work. However, there's still some strange behavior if I don't actually assign to a variable. >>> import myoot >>> from gnuradio import digital >>> formatter1 = myoot.packet_formatter_custom("1", "1", 1) >>> formatter2 = digital.packet_formatter_counter("1", 1) >>> myoot.packet_formatter_custom("1", "1", 1) Traceback (most recent call last): File "<input>", line 1, in <module> File "/home/me/target/lib/python2.7/dist-packages/myoot/myoot_swig.py", line 261, in <lambda> packet_formatter_custom_sptr.__repr__ = lambda self: "<gr_block %s (%d)>" % (self.name(), self.unique_id()) AttributeError: 'packet_formatter_custom_sptr' object has no attribute 'name' >>> digital.packet_formatter_counter("1", 1) <packet_formatter_default> Note that the sptr in gr-digital is of type packet_formatter_default, meaning it inherited the definition of the typedef from packet_formatter_default. In my case it didn't work because I used GR_SWIG_BLOCK_MAGIC2 on a non block, so the __repr__ definition (above) breaks. What should I do? I can rely on GR_SWIG_BLOCK_MAGIC2, which is not really the right way to generate SWIG templates for a non block, or I can try to get things to work without redefining the sptr typedef in the child class. In that case, I need to include the proper header file (namely, packet_formatter_default.h) from gr-digital. Should I do that explicitly in myoot_swig.i, or is there a better way to add gr-digital to include dirs in swig/CMakeLists.txt?
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