Hi there, I have a question concerning the numpy iterator C-API. I want to create a numpy string array using NPY_OBJECT as a datatype for creating the array (the reason I am going for this approach is that I do not know the length of the individual strings at the time I construct the array, I only know its shape). The original strings are stored in a std::vector<char*> instance. The approach I took was something like this
std::vector<char*> buffer = ....;
NpyIter *iter = NpyIter_New(numpy_array,
NPY_ITER_READWRITE | NPY_ITER_C_INDEX |
NPY_ITER_REFS_OK,
NPY_CORDER , NPY_NO_CASTING,nullptr);
if(iter==NULL)
{
return;
}
NpyIter_IterNextFunc *iternext = NpyIter_GetIterNext(iter,nullptr);
if(iternext == NULL)
{
std::cerr<<"Could not instantiate next iterator function"<<std::endl;
return;
}
PyObject **dataptr = (PyObject**)NpyIter_GetDataPtrArray(iter);
for(auto string: buffer)
{
dataptr[0] = PyString_FromSting(string); // this string construction seem
to work
iternext(iter);
}
NpyIter_Deallocate(iter);
This code snippet is a bit stripped down with all the safety checks
removed to make
things more readable.
However, the array I get back still contains only a None instance. Does
anyone have an idea
what I am doing wrong here?
Thanks in advance.
best regards
Eugen
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