Question

所以我在perl中有这个代码解析xml，我希望perl文件打印到文本文件中，这样所有内容都在列中，如下所示：

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});
    }   
  }

它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

感谢任何帮助！

Answer 1

只需在printf中输入您想要的字符数： e.g。

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

Answer 2

在现代的perl中：
- 您使用open()
- 您使用my变量而不是裸字文件句柄
- 并在出现问题时输出系统错误消息（$!）：
```
open my $INFILE, '<', $fname
    or die "Couldn't open $fname: $!";
```

您必须逐行打印。您不能打印一列，然后打印另一列所以当你这样做时：

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

...当然所有数据都将在一行上。

Answer 3

我想通了......我刚才用过：

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

这就是诀窍

打印到文本文件时删除Perl中的空格

3 个答案: