打印到文本文件时删除Perl中的空格

Question

所以我在perl中有这段代码来解析xml，我希望将perl文件输出到文本文件中，以便所有内容都在如下列中：

SpectrumIndex TotalIonCount Duration Spectrum 
Integer Float Float mass,abundance;mass1,abundance1;mass 2,abundance1

这是xml代码：

<message>
       <cmd id="result_data">
          <result-file-header>
                 <path>String</path>
                 <duration>Float</duration>
                 <spectra-count>Integer</spectra-count>
          </result-file-header>
          <scan-results count="Integer">
                 <scan-result>
                 <spectrum-index>Integer</spectrum-index>
                 <time-stamp>Integer</time-stamp>
                 <tic>Float</tic>
                 <start-mass>Float</start-mass>
                 <stop-mass>Float</stop-mass>
                 <spectrum count="Integer">mass,abundance;mass1,abundance1;
                 mass2,abundance2;mass6,abundance6</spectrum>
                 </scan-result>
                 <scan-result>
                 <spectrum-index>Integer</spectrum-index>
                 <time-stamp>Integer</time-stamp>
                 <tic>Float</tic>
                 <start-mass>Float</start-mass>
                 <stop-mass>Float</stop-mass>
                 <spectrum count="Integer">mass3,abundance3;mass4,abundance4;
                 mass5,abundance5</spectrum>
                 </scan-result>
            </scan-results>
    </cmd>
</message>

但是，使用以下perl代码：

#!/usr/bin/perl-w
#example to write to text
my $file = "gapiformat.txt";
unless(open FILE, '>'.$file) {
    die "\nUnable to create $file\n";
}
use strict;
use warnings;
use XML::Simple;
use Data::Dumper;


 my $values= XMLin('samplegapi.xml',ForceArray => ['scan-result','result-file-header']);


my $results = $values->{'cmd'}->{'scan-results'}->{'scan-result'};
my $results1= $values->{'cmd'}->{'result-file-header'};

printf FILE ("%-s %-s %-s %s\n","SpectrumIndex","TotalIonCount","Spectrum","Duration");
for my $data (@$results) {
    my $spectrum=$data->{spectrum};
    for my $data1 (@$results1){    
    printf FILE ("%-s %-s %-s %-s\n",$data->{"spectrum-index"}, $data->{tic}, $spectrum          
->{'content'},$data1->{duration});
    }   
  }

将以下输出提供给文本文件：

 SpectrumIndex TotalIonCount Spectrum Duration
 Integer Float mass,abundance;mass1,abundance1;
                 mass2,abundance2;mass6,abundance6 Float
 Integer Float mass3,abundance3;mass4,abundance4;
                 mass5,abundance5 Float

任何帮助表示赞赏！

Answer 1

只需在printf中输入想要的字符数即可：

printf FILE ("%20s %20s %40s %10s\n",...)

Answer 2

1. 在现代Perl中：

   • 您使用open()的三个参数形式
   • 您使用my变量而不是裸字文件句柄
   • 当出现问题时，您将输出系统错误消息（ $! ）：

    open my $INFILE, '<', $fname or die "Couldn't open $fname: $!"; 

2. 您必须逐行打印。 您不能先打印一栏，然后再打印另一栏。
   因此，当您执行此操作时：

    printf FILE ( "%-s %-s %-s %-s\\n", $data->{"spectrum-index"}, $data->{tic}, $spectrum->{'content'}, $data1->{duration} ); 

   ...那么当然所有这些数据都将在一行上。

Answer 3

我想通了...我只是用过：

my $content=$spectrum->{'content'};
$content=~s/\s+$//g

那成功了