Return C++ integer array in Python ctypes / numpy ctypeslib incorrect output -

i attempting create c++ function return pointer array, can use in numpy. seem stuck @ basics. when print out values of array back, (which in case should numbers 0 99), after 83 don't expected results. when ask c++ function print out contents of array seems fine. know going on here?

edit:

so cannot return variable has gone out of scope. understand that. how can return array python, without passing in pointer 1 in arguments?

my python file:

python_file.py

import ctypes import itertools import numpy np  h_list=np.array(range(100), dtype=int) length = len(h_list) data = h_list.astype(np.int32) lib = ctypes.cdll('/path/to/file/ctypes_test/hello.so') mynum = lib.mynum mynum.restype = np.ctypeslib.ndpointer(dtype=ctypes.c_int, shape=(length,), flags='c_contiguous')  mynum.argtypes = [np.ctypeslib.ndpointer(ctypes.c_int, flags="c_contiguous"),                   ctypes.c_int] h = mynum(data, length) in h:     print 

the truncated output, can see after 83 things go funny:

output:

... ... 77 78 79 80 81 82 83 -23162618 -671088158 250053520 1 261248736 1 246869272 1 0 0 250053520 1 1359648784 32767 246824912 1 

my c++ file:

hello.cpp

extern "c" {     int * mynum(int *hkls, int length){     int out [length];     (int = 0; < length; i++) {         out[i]=hkls[i];     }     int * out_a = out;     return out_a; } } 

my makefile:

makefile

main: hello.cpp     g++-6 -shared -o3 -wl,-install_name,hello.so -o hello.so -fpic hello.cpp