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pointer = self.lib.tokenize(c_char_p(text))
....
self.lib.dArrayFree(pointer)

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*** Error in `/usr/bin/python': double free or corruption (out): 0x0000000002e84440 ***

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    DArray *result = tokenize("$hallo wer @ist da");
    .....
    dArrayFree(result);
    dArrayFree(result);

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class DArray(Structure):
    _fields_ = [("length", c_uint),
                ("capacity", c_uint),
                ("elems", POINTER(c_char_p))]


class RaschLexer():

    def __init__(self):
        self.lib = CDLL(./libSnowEdit.so")

        self.lib.tokenize.argtypes = [c_char_p]
        self.lib.tokenize.restype = POINTER(DArray)

        self.lib.dArrayFree.argtypes = [POINTER(DArray)]

    def getVariables(self, text):

        variables = set([])

        pointer = self.lib.tokenize(c_char_p(text))
        ret = pointer.contents
        for i in range(ret.length):
            variables.update([ret.elems[i]])

        self.lib.dArrayFree(pointer)

        return variables

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void dArrayFree(DArray *arr) {
    if (arr != NULL) {
        if (arr->elems != NULL){
            uint i;
            for (i = 0; i < arr->length; i++) {
                free(arr->elems[i]);
            }
            free(arr->elems);
        }
        free(arr);
    }
}

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from itertools import islice


class DArray(Structure):
    _fields_ = [
        ('length', c_uint),
        ('capacity', c_uint),
        ('elems', POINTER(c_char_p))
    ]

D_ARRAY_P = POINTER(DArray)


lib_snow_edit = CDLL('./libSnowEdit.so')

_tokenize = lib_snow_edit.tokenize
_tokenize.argtypes = [c_char_p]
_tokenize.restype = D_ARRAY_P

_d_array_free = lib_snow_edit.dArrayFree
_d_array_free.argtypes = [D_ARRAY_P]
_d_array_free.restype = None


def rasch_parse(text):
    d_array_p = _tokenize(text)
    try:
        d_array = d_array_p.contents
        return set(islice(d_array, d_array.length))
    finally:
        _d_array_free(d_array_p)

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DArray *newDArray() {
    DArray *arr = (DArray*) malloc(sizeof(DArray));
    arr->elems = NULL;
    arr->length = 0;
    arr->capacity = 0;
    return arr;
}

void dArrayFree(DArray *arr) {
    if (arr != NULL) {
        if (arr->elems != NULL){
            uint i;
            for (i = 0; i < arr->length; i++) {
                free(arr->elems[i]);
            }
            free(arr->elems);
        }
        free(arr);
    }
}