小时代5-perl实现前后台对接的方法

Perl“胶水”，能够将各种应用程序或者各种语言的代码结合起来。Perl可以编写普通的脚本程序，还可以使用cgi模块编写Web应用程序，同时可以使用DBI访问各种数据库。除此之外，Perl可以将各种层次的应用程序粘在一起，发挥更强大的功能。

如果前台是一个网站Web应用程序，底层或者是后台是用C，C++或者Java编写，使用Perl可以将两者对接起来，实现更强大的功能，发挥各自的优势。Perl实现该方法的途径有两个：
1) 直接在Perl脚本中嵌入别的语言编写的代码，这个可以使用Perl相关的模块，比较简单的是Inline，更能稍强但稍微复杂的是XS等。
2)另一种，是使用Perl的系统调用函数system，如：

    use strict;
    my $file="test.txt";
    system("edit $file");
    #调用dos的edit工具
    system("dir");

另一种写法:

    qx{dir};

捕获返回的结果，可以将结果赋予标量或者一个列表数组，标量的话获取结果字符的最后一样；数组的话，每个元素对应结果的每一行。
如：

    use strict;
    my @result=qx{dir};
    my $eachline;
    foreach $eachline (@result)
    {
        print "$eachline  ";
    }

还可以自己编写exe，然后由perl的system函数(或者qx)来调用。
如，可以编写一个，可给输入参数的exe程序：
main.c

    #include <stdio.h>
    #include <stdlib.h>
    int main(int argc, char **argv)
    //int main(int argc, char *argv[])
    {
        int i;
        for(i=0; i<argc; i++)
        {
                printf("%d arg is %s  ",i,argv[i]);
        }
        return 0;
    }
    //该程序的主要功能是打印出传递给main函数的各个参数。

例子：

    #!/usr/bin/perl
    use strict;
    my @result=qx{main.exe hello iam here};
    my $eachline;
    foreach $eachline (@result)
    {
        print "$eachline ";
    }

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