python调用c/c++

以下的例子摘自《python核心编程》

目的：windows 下 Python调用c 语言的函数

Function 1：int fac(int n);

Function 2: char * reverse(char *s);

Function 3: int test();

Step one：创建Extest.c

/*************************************************************************
> File Name: Extest.c
> Author: ---
> Mail: ---
> Created Time: ---
************************************************************************/

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int fac(int n)
{
if (n < 2) return 1;
return n*fac(n-1);
}

char * reverse(char * s)
{
register char t;
register char *p = s;
register char *q = (s + (strlen(s) - 1));

while (s && (p < q))
{
t = *p;
*p++ = *q;
*q-- = t;
}
return s;
}

int test()
{
char s[15];
printf("4 != %d\n", fac(4));
printf("8 != %d\n", fac(8));
strcpy(s, "abcdef");
printf("reserving 'abcdef', we get %s\n", reverse(s));
strcpy(s, "madam");
printf("reserving 'madam', we get %s\n", reverse(s));
return 0;
}

/////////////////////////////////////////////////////
#include "python.h"
///< python 把所有对象看做是PyObject

static PyObject * Extest_fac(PyObject * self, PyObject * args)
{
int num;
if (!PyArg_ParseTuple(args, "i", &num))
return NULL;
return (PyObject*)(Py_BuildValue("i", fac(num)));
}

static PyObject * Extest_doppel(PyObject * self, PyObject * args)
{
char * orig_str;
char * dupe_str;
PyObject * retval;

if (!PyArg_ParseTuple(args, "s", &orig_str))
return NULL;
dupe_str = reverse(strdup(orig_str));
retval = (PyObject*)(Py_BuildValue("ss", orig_str, dupe_str));
free(dupe_str);
return retval;
}

static PyObject * Extest_test(PyObject * self, PyObject * args)
{

test();
return (PyObject *)(Py_BuildValue(""));
}

///< 导出的函数明 fac、doppel、test
static PyMethodDef ExtestMethods[] = {
{"fac", Extest_fac, METH_VARARGS},
{"doppel", Extest_doppel, METH_VARARGS},
{"test", Extest_test, METH_VARARGS},
{NULL, NULL},
};

void initExtest()
{
Py_InitModule("Extest", ExtestMethods);
}

step two： 创建编译文件

#!/usr/bin/env python
# coding=utf-8

from distutils.core import setup, Extension

Mod = 'Extest'
FileName = 'Extest.c'

setup(name = Mod, ext_modules=[
Extension(Mod , sources=[FileName ])])

step three： 进入python编译

python setup.py build

然后就会在 相应目录下 生成一个 build文件夹，，，，看到 xxx.pyd,lib 之类

step four：使用接口

把库的目录加入呗

import sys
sys.path.append(....)
import Extest
help(Extest)