I tried building the spammodule.c example described in the documentation
section "Extending Python with C or C++." As shown the code compiles OK but
generates a link error:
LINK : error LNK2001: unresolved external symbol init_spam
build\temp.win32-2.7\Release\_spam.lib : fatal error LNK1120: 1 unresolved
externals
I tried changing the name of the initialization function spam_system to
init_spam and removed the static declaration. This compiled and linked
without errors but generated a system error when _spam was imported.
The same error occurs with Python 2.6 and the current compiler.
The code and the setup.py file are shown below.
setup.py:
-----------------------------------------------------------------------------
from setuptools import setup, Extension
setup(name='spam',
version='0.1',
description='test module',
ext_modules=[Extension('_spam', ['spammodule.c'],
include_dirs=[C:\Documents and
Settings\Owner\Miniconda\include],
)],
)
sammodule.c
--------------------------------------------------
#include <python.h>
static PyObject *SpamError;
static PyObject *
spam_system(PyObject *self, PyObject *args)
{
const char *command;
int sts;
if (!PyArg_ParseTuple(args, "s", &command))
return NULL;
sts = system(command);
if (sts < 0) {
PyErr_SetString(SpamError, "System command failed");
return NULL;
}
return PyLong_FromLong(sts);
}
static PyMethodDef SpamMethods[] = {
{"system", spam_system, METH_VARARGS,
"Execute a shell command."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
PyMODINIT_FUNC
initspam(void)
{
PyObject *m;
m = Py_InitModule("spam", SpamMethods);
if (m == NULL)
return;
SpamError = PyErr_NewException("spam.error", NULL, NULL);
Py_INCREF(SpamError);
PyModule_AddObject(m, "error", SpamError);
}
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