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I have searched online for a while, but what is the correct way to pass bytes to and fro between Python and C? I have leveraged the example from SWIG documentation:

C Code:

char* foo(char *buff, int size)
{
    return buff;
}

Wrapper code:

%include <pybuffer.i>

%pybuffer_binary(char *buff, int size);
char* foo(char *buff, int size);

Error:

example_wrap.c: In function ‘_wrap_foo’:
example_wrap.c:3385:19: error: ‘size’ undeclared (first use in this function)
     arg2 = (int) (size / sizeof(char));               
example_wrap.c:3385:19: note: each undeclared identifier is reported only once for each function it appears in
example_wrap.c:3387:12: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
   result = (char *)foo(arg1,arg2);

EDIT: the Include pybuffer.i: https://github.com/swig/swig/blob/master/Lib/python/pybuffer.i

nikk
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