October 2022
Beginner to intermediate
390 pages
7h 5m
Chinese
Content preview from Perl语言入门（第8版）
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218
｜
第
11
章
你可以利用
File::Spec
模块来操作文件说明（
file specification
），也就是文件名、
目录名以及文件系统里的其他名称。它和
File::Basename
一样会在运行时判断操
作系统的类型，并采用正确规则。但
File::Spec
是面向对象的（
Object Oriented
，
OO
）模块，这点和
File::Basename
不同。
要是你从未因
OO
热潮而激动，请不必烦心。如果你了解对象是什么，那非常好，你
可以使用这个
OO
模块；要是你不知道何谓对象，那也没关系，只要照样键入我们展
示给你的代码，它就会正常工作，时间久了你自然就明白了。
在这个例子里，
File::Spec
的说明文档告诉我们应该使用
catfile
这个方法。方法
（
method
）是什么呢？就目前我们所关心的来说，它只不过是另一种函数而已。不同
的是，你必须通过全名来调用
File::Spec
中的方法，比如：
use File::Spec;
.
. #
取得
$dirname
和
$basename
的值，方法同上
.
my $new_name = File::Spec->catfile($dirname, $basename);
rename($old_name, $new_name)
or warn "Can't rename '$old_name' to '$new_name': $!";
如你所见，调用方法时的全名应该由模块的名称（此处称为类（
class
））、一
个瘦箭头（ ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.