使用swig解析头文件

Question

I have a header file with struct definitions that I'd like to be able to parse in python. In order to do this I turned to Swig.

Lets say the header file is named "ah". I first renamed it to "ac" and added an empty "ah" file in the same folder.

Next, I added in an "a_wrap.i" file with the following contents.

%module a
%{
    /* the resulting C file should be built as a python extension */
    #define SWIG_FILE_WITH_INIT
    /*  Includes the header in the wrapper code */
    #include "a.h"
%}
/*  Parse the header file to generate wrappers */
%include "a.h"
extern struct a_a;
extern struct a_b;
extern struct a_c;

Next, I wrote a setup.py file as follows :

from distutils.core import setup, Extension

setup(ext_modules=[Extension("_a",
      sources=["a.c", "a_wrap.i"])])

Next, I did the build as

python setup.py build_ext --inplace 

I finally tried to import it in python

>>> import a # it works, yaay
>>> dir(a)
...
...

I was hoping for a way to access the structs defined in "ac"(originally ah). However, I don't seem to be able to find a way to do that. How can I solve this? I'm looking for a way to access the struct's defined in the header file from python.

Answer 1

The global variables a_a , a_b and a_c should be accessible from [within your SWIG Python module via cvar`] 1 :

import a
print a.cvar.a_a
print a.cvar.a_b
# etc.