Re: [Swig-user] Passing a Python List to C++

[Maciej D. <mac...@gm...>]

2008/6/26 EntonH <en...@gm...>:
>
> hi there,
>
> I am trying to pass a list like ["Data1","Data2","Data3",0] from Python to
> C++.
> How do i have to describe the function in the interface file (*.i) when i
> want to pass this list as an array to the C++ source?
>
> Greetings,
> EntonH
> --

You can pass it as a vector of strings:

// example.h
#include <string>
#include <vector>

void foo(std::vector<std::string> v);

// example.i:
%{
#include "example.h"
%}
%include stl.i
%template(StringVector) std::vector<std::string>;
%include "example.h"

Or as a C strings array:

// example.h
void foo(char** list);

// example.i
%{
#include "example.h"
%}

%typemap(in) char** list {
  Py_ssize_t list_len = PyList_Size($input);
  Py_ssize_t i;
  $1 = (char**) malloc((list_len + 1) * sizeof(char*));
  for (i = 0; i < list_len; ++i) {
    PyObject* obj = PyList_GetItem($input, i);
    $1[i] = PyString_AsString(obj);
  }
  $1[list_len] = 0;
}

%typemap(freearg) char** list {
  if ($1) free($1);
}

extern void foo(char** list);

--
Maciek