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C による関数を Python で呼び出す例

example.c

/* File : example.c */

#include <time.h>
double My_variable = 3.0;

int fact(int n) {
    if (n <= 1) return 1;
    else return n*fact(n-1);
}

int my_mod(int x, int y) {
    return (x%y);
}

char *get_time()
{
    time_t ltime;
    time(&ltime);
    return ctime(&ltime);
}

/* end of file */

example.i

/* example.i */
%module example
%{
/* Put header files here (optional) */
%}

extern double My_variable;
extern int fact(int n);
extern int my_mod(int x, int y);
extern char *get_time();

実行例

% swig -python example.i
% cc -Aa +z -c example.c example_wrap.c \
     -I/usr/local/include/python1.4 -I/usr/local/lib/python1.4/config
% ld -b example.o example_wrap.o -o example.sl

% python
Python 1.4 (Nov  7 1997)  [GCC 2.7.2]
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>> import example
>>> example.fact(5)
120
>>> example.my_mod(7,3)
1
>>> example.get_time()
'Fri Nov  7 21:43:32 1997\012'
>>>

C による関数を Perl5 で呼び出す例

% swig -static -perl5 -lperlmain.i example.i
% gcc -o a.out example.c example_wrap.c \
  /opt/perl5/lib/PA-RISC1.1/5.003/CORE/libperl.a -lm \
  -I/opt/perl5/lib/PA-RISC1.1/5.003/CORE
% ./a.out
use example;
print $example::My_variable,"\n";
print example::fact(5),"\n";
print example::get_time(),"\n";
<ctrl-d>
3
120
Mon Nov 10 17:04:05 1997