[Numpy-discussion] Complete and build the example from the "Using Numpy C-API" documentation.
Warren Weckesser
warren.weckesser@enthought....
Tue Jul 20 18:04:42 CDT 2010
Warren Weckesser wrote:
> I would like to take the example shown here:
>
> http://docs.scipy.org/doc/numpy/user/c-info.how-to-extend.html#example
>
> and complete the code so I can build and test the extension module. Is
> that example currently correct? It is slightly different from the older
> example in the numpy book, so someone must have had a reason to change it.
>
> I've added the C array of PyMethodDefs and the module init function, but
> I'm still searching for the correct #includes for the numpy stuff. Any
> suggestions (or pointers to similar simple but complete examples) would
> be appreciated.
>
>
I've made some progress, and now I'm getting a bus error.
With the following extension module, calling example.foo results
in a bus error, regardless of the arguments given. The error
occurs in the call to PyArg_ParseTuple. I'm using same format
string as in the example in the numpy docs, "O!". Any ideas?
-----
#include <stdio.h>
#include "Python.h"
#include "numpy/arrayobject.h"
static PyObject *foo_wrap(PyObject *dummy, PyObject *args)
{
PyObject *arg1 = NULL;
printf("boo\n");
if (!PyArg_ParseTuple(args, "O!", &PyArray_Type, &arg1)) {
printf("bad\n");
return NULL;
}
printf("here\n");
return Py_None;
}
static PyMethodDef wrappers[] = {
{"foo", foo_wrap, METH_VARARGS, "just a test"},
{NULL, NULL, 0, NULL} /* Sentinel */
};
PyMODINIT_FUNC
initexample(void)
{
(void) Py_InitModule("example", wrappers);
}
-----
> Warren
>
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