I am trying to wrap a header file which has lots of functions like this 

**test.h**

```
void test(int N, int* data_in, int* data_out);

```

so that I can use those from numpy.

Right now I have the following cython code:

**test.pyx**

```
import numpy as np
cimport numpy as np

ctypedef np.int_t itype_t

cdef extern from 'VolumeForm.h':
    void _test 'test' (int, int*, int*)

def wrap_test(np.ndarray[itype_t, ndim=2] data):
    cdef np.ndarray[dtype_t, ndim=1] out
    out = np.zeros((data.shape[0],1), dtype=np.double)
    _test(
        data.shape[0],
        <itype_t*> data.data,
        <itype_t*> out.data
    )
    return out

```

However, when I try to compile it I get the error:

```
Error converting Pyrex file to C:
(...)
Cannot assign type 'test.itype_t *' to 'int *'

```

How can I fix this?