Problems passing numpy.ndarray to ctypes, but to get an erroneous result

Note: this is not a question. I solved it and posted it here, trying to share what I learned.

I ran into the problem of using numpy last night, and here's how I simplified it for short code. At first it looks like an error, but when I try to write this problem, I realized that it was my own error. I hope that someone else who also comes to this issue will benefit from this!

This repeats on my Win 7 x64 with the WinSDK 7.1 C compiler. Python version is 3.3.3, built with MSC v.1600. The PC version is 1.8.

0) Overview: when I pass ndarray to my dll compiled from c-code, c code sees a different array than the one I passed.

1) Write the code c:

// testdll.c
#include <stdlib.h>

__declspec(dllexport) void copy_ndarray(double *array1, double *array2, size_t array_length);

void copy_ndarray(double *array1, double *array2, size_t array_length)
{
    size_t i;
    for(i=0; i<array_length; i++)
        array2[i] = array1[i];
    return;
}

2) Write the python code:

import numpy as np
import ctypes


# wrap the function from dll to python
lib = ctypes.cdll.LoadLibrary('./testdll.dll')
fun = lib.copy_ndarray
fun.restype = None
fun.argtypes = [np.ctypeslib.ndpointer(ctypes.c_double), np.ctypeslib.ndpointer(ctypes.c_double), ctypes.c_size_t]
# Initialize array1 and array2
array_length= 10
temp = np.c_[100.*np.ones(array_length), 200.*np.ones(array_length)]
array1 = temp[:, 1]
array2 = np.zeros(array_length)
fun(array1, array2, array_length)

3) . , array2.