Ruby：Dir.glob不返回任何文件 [英] Ruby: Dir.glob not returning any files

问题描述

我试图将文件从一个文件夹复制到另一个文件夹，然后记录所有复制到日志文件中的文件的名称。两个文件夹都在同一个目录中，我通过命令行使用该路径。在我的程序中，当前是通过

I am trying to copy files from one folder into another folder, and then record the names of all the files that were copied into a log file. Both folders are in the same directory and I take that path via the command line. In my program currently that happens through

argument3 = ARGV[2] + "\\"

成功成为 c：\user\alexander\desktop\。
然后我将台式机上的文件复制到已有的台式机文件夹中，

which successfully becomes 'c:\user\alexander\desktop\'. Then I copy the files on my desktop into a folder already on the desktop with

system "copy #{argument3}*.* #{argument3}TestFolder"

这也成功完成了我从cmd输出验证的并检查文件夹本身。最后，我试图将文件名保存到路径为 c：\user\alexander\desktop\log.txt的日志文件中。我尝试通过使用

This also successfully completes which I verified from the cmd output and from checking the folder itself. Finally I am trying to save the filenames to a log file with the path 'c:\user\alexander\desktop\log.txt'. I tried to do this by using

logFile = "c:\\user\\alexander\\desktop\\log.txt"
Dir.glob(argument3 + "*.*").each do |fileName|
    File.open(logFile, 'a') {|file| file << "\n" + fileName}
end

c $ c> logFile 为空。我试图通过将 File.open 选项更改为 w而不是 a来解决此问题，但仍然没有执行任何操作。然后我以为我一定是错误地实现了它，所以我尝试只放

This does nothing and leaves my logFile empty. I tried to fix this by changing the File.open option to 'w' instead of 'a' but that still did nothing. Then I thought I must be implementing it incorrectly so I tried just putting

Dir.glob(argument3 + "*.*").each do |fileName|
    puts fileName
end

作为健全性检查，但这也不会输出。我要完成的目标有可能吗？如果是，那我在做什么错了，如果不是，那是另一种方法吗？

as a sanity check, but this also outputs nothing. Is what I am trying to accomplish possible? If it is, what am I doing wrong, and if its not is there another way to do this?

编辑1：
更改 Dir.glob 的参数

Dir.glob("*")

使其将当前目录文件写入日志。我以为那意味着我的参数3变量中必须有一些看不见的错字，但是当我这样做的时候

is making it write the current directories files to the log. I thought that meant I must have some unseen typo in my argument3 variable but when I did

puts argument3 + "*"

其输出c：\user\alexander\desktop *我在通过之前尝试连接文件路径用作 Dir.glob 的参数

its outputting c:\user\alexander\desktop* I tried concatenating the file path before I passed it as an argument to Dir.glob as

filePath = argument3 + "*"
Dir.glob(argument3 + "*.*").each do |fileName|
    File.open(logFile, 'a') {|file| file << "\n" + fileName}
end

而且它仍然无法正常工作。将确切的文件路径传递到 Dir.glob 有什么技巧吗？我不能保证该程序始终位于运行时需要复制的目录中。

And its still not working as I expected. Is there some trick to passing in the exact file path to Dir.glob? I can't guarantee that the program will always be in the directory it needs to copy from when its run.

推荐答案

Dir.glob 不带反斜杠。甚至在Windows上也将它们替换为正斜杠：

Dir.glob doesn't take backslashes. Substitute them for forward slashes, even on Windows:

logFile = "c:\\user\\alexander\\desktop\\log.txt"
Dir.glob(argument3.gsub('\\','/') + "*.*").each do |fileName|
    File.open(logFile, 'a') {|file| file << "\n" + fileName}
end

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