在Windows上使用Perl，如何确保在chdir之后以正确的格式获取路径? [英] Using Perl on Windows, how can I ensure I get the path in the correct case following a chdir?

问题描述

考虑以下代码:

print cwd . "\n";
$str= "../source"; # note the lower case 's'    
chdir($str);
print cwd . "\n";

如果我当前的目录是c:\parentdir\Source(请注意大写的"S")，则输出为:

If my current directory is c:\parentdir\Source (note the capital 'S'), the output of this will be:

c:/parentdir/Source
c:/parentdir/source

这会在我的子程序中引起问题，该子程序关心文件夹名称的正确大小写. $ str被传递到我的子例程中，因此我无法提前知道它是否具有正确的大小写.如何确定与$str匹配的路径的大小写正确?

This causes problems in a subroutine of mine that cares about the correct case of folder names. $str is passed in to my subroutine, so I can't know ahead of time whether it has the correct case. How do I determine the case-correct name of a path that matches $str?

此处有更多详细信息:

• 我意识到../source是一个病理例子，但它可以 说明问题.即使$str正在请求 当前文件夹以外的其他文件夹.
• 我尝试了多种选择，包括rel2abs，这是对 $str和其他，但是它们似乎都返回"source"而不是 "Source".
• 我可以在$str/..中搜索所有目录，并将它们全部转换为 绝对路径，并将它们与$str的绝对路径版本进行比较， 但这似乎是一个hack.我希望有一些更优雅的东西.

• I realize that ../source is a pathological example, but it serves to illustrate the problem. It occurs even if $str is requesting a folder other than the current one.
• I have tried numerous options, including rel2abs, a glob search on $str, and others, but they all seem to return "source" instead of "Source".
• I could search $str/.. for all directories, convert them all to absolute paths and compare them to an absolute path version of $str, but that seems like a hack. I was hoping for something more elegant.

推荐答案

#!/usr/bin/perl

use warnings; use strict;
use Cwd;
use File::Spec::Functions qw( canonpath );
use Win32;

print canonpath( cwd ), "\n";

chdir '../source';

print canonpath( cwd ), "\n";

print canonpath( Win32::GetLongPathName( cwd ) ), "\n";

C:\DOCUME~1\...\LOCALS~1\Temp\t\Source> t
C:\DOCUME~1\...\LOCALS~1\Temp\t\Source
C:\DOCUME~1\...\LOCALS~1\Temp\t\source
C:\Documents and Settings\...\Local Settings\Temp\t\Source

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