使用boost将数据从PyObject复制到float*

我想这应该很容易,但我做不到。我想打电话给 C++-function 来自python。作为论据我有一个 np-array . 这个 C++

void foo_python(PyObject *p, const int m, const int n){
    float *data = new float[m*n];
    memcpy(data,PyArray_DATA(p),m*n*sizeof(float));
    delete [] data;
}

当我从python调用它时

hello_ext.foo_python(A,A.shape[0], A.shape[1])

  error: cannot convert ‘PyObject* {aka _object*}’ to ‘PyArrayObject* {aka tagPyArrayObject*}’ for argument ‘1’ to ‘void* PyArray_DATA(PyArrayObject*)’

这以前很管用,但后来我把 #include <boost/python/numpy.hpp> ,这在我返回的函数中是必需的 ndarrays

np::ndarray test() {
    int *data = new int[5];
    for (int i = 0; i < 5; ++i){
        data[i] = i+1;
    }
    p::tuple shape = p::make_tuple(5);
    p::tuple stride = p::make_tuple(sizeof(int));
    p::object own;
    np::dtype dt = np::dtype::get_builtin<int>();
    std::cout << " Here " << std::endl;
    np::ndarray array = np::from_data(data, dt, shape, stride, own);
    cout<<"Selective Multidimensional array :: "<<std::endl << 
    p::extract<char const *>(p::str(array)) << std::endl;
    // delete [] data;
    return array;
}

这是模块:

BOOST_PYTHON_MODULE(libhello_ext)
{
    using namespace boost::python;
    Py_Initialize();
    boost::python::numpy::initialize();
    def("greet", greet);
    def("sum", sum);
    def("foo_python", foo_python);
    def("test", test);
}