Thanks Andreas,
I've found out my solution in pyrap source code (pyrap.googlecode.com). I post
it here as it can be usefull for others:
#include <numpy/ndarrayobject.h>
int type = PyArray_TYPE(anArray.ptr());
for (unsigned i = 0; i < 3; ++ i)
{
void * buffer = PyArray_GETPTR1(anArray.ptr(), i);
double val = 0;
switch (type)
{
case NPY_BOOL:
val = (*(::npy_bool*)buffer != 0);
break;
case NPY_INT8:
val = int(*(::npy_int8*)buffer);
break;
case NPY_UINT8:
val = uint(*(::npy_uint8*)buffer);
break;
case NPY_INT16:
val = int(*(::npy_int16*)buffer);
break;
case NPY_UINT16:
val = uint(*(::npy_int16*)buffer);
break;
case NPY_INT32:
val = int(*(::npy_int32*)buffer);
break;
case NPY_UINT32:
val = uint(*(::npy_int32*)buffer);
break;
case NPY_INT64:
val = uint(*(::npy_int64*)buffer);
break;
case NPY_UINT64:
val = uint(*(::npy_int64*)buffer);
break;
case NPY_FLOAT32:
val = float(*(::npy_float32*)buffer);
break;
case NPY_FLOAT64:
val = double(*(::npy_float64*)buffer);
break;
}
}
Jean-Charles
-----Message d'origine-----
De : Andreas Kloeckner [mailto:li...@informa.tiker.net]
Envoyé : mardi 11 mai 2010 17:46
À : QUILLET Jean-Charles; 'cplusplus-sig@python.org'
Objet : Re: [C++-sig] Trouble converting data from numpy.array to c++
Hi Jean-Charles,
On Tue, 11 May 2010 11:32:08 +0200, QUILLET Jean-Charles
<jean-charles.quil...@alyotech.fr> wrote:
> I've got this problem I cannot solve. I've a c++ application from which I
> create an array sending to python this string:
>
> anArray = numpy.array((1, 2, 3))
>
> After extracting the symbol "anArray" from the directory in a
> boost::python::object, I'm trying to extract the values in C++:
>
> int val = bp::extract<int>(anArray[0]);
>
> It doesn't work and raise the error:
This is probably not what you wanted to hear, but my PyUblas package
solves your problem. :)
http://mathema.tician.de/software/pyublas
HTH,
Andreas
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