perl C/C++ 扩展（二）

第二讲
perl 加载c/c++的库

先通过h2xs 创建一个新的工程

h2xs -A -n two_test

进入目录

cd two_test

创建一个mylib文件夹，存放静态库

mkdir mylib

c程序头文件chen.h

#include<stdio.h>
void chen(char *);

c程序代码chen.c

#include "chen.h"
void chen(char * name){
printf("input string is : %s\n", name);
}

编译静态库

gcc -c chen.c
ar -r libchen.a chen.o

将libchen.a静态库与chen.h头文件拷贝到two_test/mylib

cp libchen.a two_test/mylib/
cp chen.h two_test/mylib

修改perl 生成makefile 的脚本Makefile.PL

use 5.014002;
use ExtUtils::MakeMaker;
# See lib/ExtUtils/MakeMaker.pm for details of how to influence
# the contents of the Makefile that is written.
WriteMakefile(
NAME => 'two_test',
VERSION_FROM => 'lib/two_test.pm', # finds $VERSION
PREREQ_PM => {}, # e.g., Module::Name => 1.1

($] >= 5.005 ? ## Add these new keywords supported since 5.005
(ABSTRACT_FROM => 'lib/two_test.pm', # retrieve abstract from module
AUTHOR => 'root <root@>') : ()),
LIBS => [''], # e.g., '-lm'
DEFINE => '', # e.g., '-DHAVE_SOMETHING'
INC => '-I.', # e.g., '-I. -I/usr/include/other'
# Un-comment this if you add C files to link with later:
# OBJECT => '$(O_FILES)', # link all the C files too
MYEXTLIB => 'mylib/libchen.a'
);

MYEXTLIB => 'mylib/libchen.a' 是新增的命令，作用是在生成perl 扩展包时包含libchen.a的库

修改two_test.xs 文件

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include "ppport.h"
#include "mylib/chen.h"

MODULE = two_test PACKAGE = two_test

void
chen(name)
char * name

红色部分为增加代码

编译并安装,安装需要root 权限

perl Makefile.PL
make
make install

编写一个测试程序two_test.pl, 测试扩展

#!/usr/bin/perl
use two_test;
$one = "sfjak";
&two_test::chen($one);

执行程序

perl two_test.pl

输出:
input string is : sfjak

成功调用扩展

参考文章：
一个简单例子
http://www.chinaunix.net/old_jh/25/951221.html
IBM介绍如何使用c扩展perl
http://www.ibm.com/developerworks/cn/aix/library/0908_tangming_perltoc/
介绍如何使用C++扩展perl