I was wondering what is the correct way to wrap an array of strings in C to a Python list using SWIG.
The array is inside a struct :
typedef struct {
char** my_array;
char* some_string;
}Foo;
SWIG automatically wraps some_string to a python string.
What should I put in the SWIG interface file so that I can access my_array in Python as a regular Python string list ['string1', 'string2' ] ?
I have used typemap as sugested :
%typemap(python,out) char** {
int len,i;
len = 0;
while ($1[len]) len++;
$result = PyList_New(len);
for (i = 0; i < len; i++) {
PyList_SetItem($result,i,PyString_FromString($1[i]));
}
}
But that still didn't work. In Python, the my_array variable appears as SwigPyObject: _20afba0100000000_p_p_char.
I wonder if that is because the char** is inside a struct? Maybe I need to inform SWIG that?
Any ideas?
I don't think there is a option to handle this conversion automatically in SWIG. You need use Typemap feature of SWIG and write type converter manually. Here you can find a conversion from Python list to char** http://www.swig.org/Doc1.3/Python.html#Python_nn59 so half of job is done. What you need to do right now is to check rest of documentation of Typemap and write converter from char** to Python list.
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