Integrating C Code with Python
Revision as of 16:31, 3 March 2009 by PeterHarding (talk | contribs)
Overview
This example was built under Linux...
Examples
Simple
Makefile
#---------------------------------------------------------------------
all:
gcc -I /usr/local/include/python2.5 -fPIC -c test.c
gcc -shared -o test.so test.o
#---------------------------------------------------------------------
clean:
-/bin/rm -rf *.o
#---------------------------------------------------------------------
test.c
Note, on the system this demo was implemented on a version of Python 2.5 had been built from source and installed into /usr/local, so Python.h and other Python header files were located in /usr/local/include/python2.5/
#include "Python.h"
static PyObject *TestError;
//------------------------------------------------------------------------------
static PyObject* test_system(PyObject *self, PyObject *args);
//------------------------------------------------------------------------------
static PyMethodDef TestMethods[] = {
{"system", test_system, METH_VARARGS, "Execute a shell command."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
//------------------------------------------------------------------------------
static PyObject *
test_system(PyObject *self, PyObject *args)
{
const char *command;
int status;
if (!PyArg_ParseTuple(args, "s", &command))
return NULL;
status= system(command);
return Py_BuildValue("i", status);
} // test_system
//------------------------------------------------------------------------------
PyMODINIT_FUNC
inittest(void)
{
PyObject *m;
m = Py_InitModule("test", TestMethods);
TestError = PyErr_NewException("test.error", NULL, NULL);
Py_INCREF(TestError);
PyModule_AddObject(m, "error", TestError);
} // inittest
//------------------------------------------------------------------------------
[xxx]# make
gcc -I /usr/local/include/python2.5 -fPIC -c test.c
gcc -shared -o test.so test.o
[xxx]# python
Python 2.5.1 (r251:54863, Aug 17 2007, 11:25:00)
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import test
>>> t = test.system('ls -l')
total 76
-rw-r--r-- 1 root root 638 Nov 19 15:12 dls.cpp
-rw-r--r-- 1 root root 134 Nov 19 15:13 hello.cpp
-rw-r--r-- 1 root root 333 Nov 19 16:03 Makefile
-rwxr-xr-x 1 root root 4204 Nov 19 14:35 Python__2_5.h
-rwxr-xr-x 1 root root 5301 Nov 19 15:24 spam.so
-rw-r--r-- 1 root root 1190 Nov 19 16:03 test.c
-rw-r--r-- 1 root root 1884 Nov 19 16:10 test.o
-rwxr-xr-x 1 root root 5301 Nov 19 16:10 test.so
>>> t
0
>>>