Return struct causes segfault

I'm struggling with returning a struct value using ctypes. Mainly, it keeps
segfaulting when I try and get the values from the returned object. I have
my python script setup like this:

import ctypes
import numpy as np
from numpy.ctypeslib import ndpointer


class PhotoInfo(ctypes.Structure):
    _fields_ = [
        ('times', ctypes.POINTER(ctypes.c_double)),
        ('fluxes', ctypes.POINTER(ctypes.c_double)),
    ]


def main():
    lib = ctypes.cdll.LoadLibrary('cfile.so')

    start = lib.start
    start.restype = ctypes.POINTER(PhotoInfo)
    start.argtypes = [
        ctypes.c_int,
        ndpointer(ctypes.c_double),
    ]

    N = 3
    mass = np.array([0.00020335520, 5.977884E-05, 9.320397E-08])

    phin = start(N, mass)

    print phin[0].times[0]

And in my c file:

#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>

using namespace std;

typedef struct {
  double *times;
  double *fluxes;
} PhotoInfo;

extern "C" {
  PhotoInfo *start(int N, double *mass);
}

PhotoInfo *start(int N, double *mass) {
  PhotoInfo phin;
  vector<double> times;
  vector<double> fluxes;

// Here, I read in a file and fill times and fluxes with doubles using
// times.push_back(t) and fluxes.push_back(f)\

  phin.times = &times[0];
  phin.fluxes = &times[0];
  return &phin;
}

Any guidance on this would be greatly appreciated!

Nicholas Earl
Graduate Research Assistant
San Diego State University

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