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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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小时代5-perl实现前后台对接的方法
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