Python C API How to pass array of structs from C to Python

Question

For a python module I'm creating, I want to pass to the python user an array of structs like this:

struct tcpstat
{
    inet_prefix local;
    inet_prefix remote;
    int     lport;
    int     rport;
    int     state;
    int     rq, wq;
    int     timer;
    int     timeout;
    int     retrs;
    unsigned    ino;
    int     probes;
    unsigned    uid;
    int     refcnt;
    unsigned long long sk;
    int     rto, ato, qack, cwnd, ssthresh;
};

I thought that Py_BuildValues was the function I was looking for. But seems like it isn't. Looking in the Python documentation I found the Buffer Protocol. But is the first time I'm developing a python module and the official documentation didn't help me much.

Is the Buffer Protocol the best solution for my problem? If so, How could I return my array from C to python?

Have you tried followings.. stackoverflow.com/questions/4351721/… forums.indiegamer.com/… — Hiren Pandya
– Hiren Pandya, Commented Apr 3, 2013 at 11:53

Alejandro Alcalde · Accepted Answer · 2013-04-05 11:49:36Z

8

Finnally what I did was make a list Object with PyListObject and append to that list a dictionary with the values of the struct that I want to show to the python user.

Hope this will help someone with the same doubt, here is the code:

PyObject *dict = NULL;
PyListObject *list;

list = (PyListObject *) Py_BuildValue("[]");

int i = 0;
for (i; i < stats_length; i++) {
    dict = Py_BuildValue("{s:i}", "LPort", stats[i].lport);
    PyList_Append(list, dict);
}

return (PyObject *) list;

answered Apr 5, 2013 at 11:49

Alejandro Alcalde

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3 Comments

P0W Over a year ago

Did you have a solution to send entire structure not just a particular filed ?

Alejandro Alcalde Over a year ago

No I haven't. But I think if you want to return the entire dict, maybe return (PyObject *) dict; may work. Sorry but I do not have the code to prove it.

gnarlyninja Over a year ago

Yeah the official docs suck for this. But this is just what I was looking for thanks!

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