[Numpy-discussion] Extending C with Python

[Jialin Liu]

Amazing! It works! Thank you Robert.

I've been stuck with this many days.

Best,
Jialin
LBNL/NERSC

On Tue, Jan 30, 2018 at 10:52 PM, Robert Kern <robert.kern at gmail.com> wrote:

> On Wed, Jan 31, 2018 at 3:25 PM, Jialin Liu <jalnliu at lbl.gov> wrote:
>
>> Hello,
>> I'm extending C with python (which is opposite way of what people usually
>> do, extending python with C), I'm currently stuck in passing a C array to
>> python layer, could anyone plz advise?
>>
>> I have a C buffer in my C code and want to pass it to a python function.
>> In the C code, I have:
>>
>> npy_intp  dims [2];
>>> dims[0] = 10;
>>> dims[1] = 20;
>>> import_array();
>>> npy_intp m=2;
>>> PyObject * py_dims = PyArray_SimpleNewFromData(1, &m, NPY_INT16 ,(void
>>> *)dims ); // I also tried NPY_INT
>>> PyObject_CallMethod(pInstance, method_name, "O", py_dims);
>>
>>
>> In the Python code, I want to just print that array:
>>
>> def f(self, dims):
>>
>>    print ("np array:%d,%d"%(dims[0],dims[1]))
>>
>>
>>
>> But it only prints the first number correctly, i.e., dims[0]. The second
>> number is always 0.
>>
>
> The correct typecode would be NPY_INTP.
>
> --
> Robert Kern
>
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