小時代5-perl實現前後台對接的方法

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Perl“膠水”，能夠將各種應用程式或者各種語言的代碼結合起來。Perl可以編寫普通的指令碼程式，還可以使用cgi模組編寫Web應用程式，同時可以使用DBI訪問各種資料庫。除此之外，Perl可以將各種層次的應用程式粘在一起，發揮更強大的功能。如果前台是一個網站Web應用程式，底層或者是後台是用C，C++或者Java編寫，使用Perl可以將兩者對接起來，實現更強大的功能，發揮各自的優勢。Perl實現該方法的途徑有兩個：1) 直接在Perl指令碼中嵌入別的語言編寫的代碼，這個可以使用Perl相關的模組，比較簡單的是Inline，更能稍強但稍微複雜的是XS等。2)另一種，是使用Perl的系統調用函數system，如：    use strict;    my $file="test.txt";    system("edit $file");    #調用dos的edit工具    system("dir");另一種寫法:    qx{dir};捕獲返回的結果，可以將結果賦予標量或者一個列表數組，標量的話擷取結果字元的最後一樣；數組的話，每個元素對應結果的每一行。如：    use strict;    my @result=qx{dir};    my $eachline;    foreach $eachline (@result)    {        print "$eachline  ";    }還可以自己編寫exe，然後由perl的system函數(或者qx)來調用。如，可以編寫一個，可給輸入參數的exe程式：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;    }    //該程式的主要功能是列印出傳遞給main函數的各個參數。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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小時代5-perl實現前後台對接的方法