解析从相对路径和/或文件名绝对路径 [英] Resolve absolute path from relative path and/or file name

问题描述

有没有在Windows批处理脚本的方式从一个包含文件名和/或相对路径返回一个值的绝对路径？

Is there a way in a Windows batch script to return an absolute path from a value containing a filename and/or relative path?

考虑：

"..\"
"..\somefile.txt"

我需要绝对相对于该批处理文件的路径。

I need the absolute path relative to the batch file.

示例：

• somefile.txt位于C：\\富\\


• test.bat的位于C：\\富\\栏。


• 用户在打开一个命令窗口C：\\富，并呼吁酒吧\\ test.bat的.. \\ somefile.txt


• 在批处理文件C：\\富\\ somefile.txt将从％1 导出

• "somefile.txt" is located in "C:\Foo\"
• "test.bat" is located in "C:\Foo\Bar".
• User opens a command window in "C:\Foo" and calls Bar\test.bat ..\somefile.txt
• In the batch file "C:\Foo\somefile.txt" would be derived from %1

推荐答案

在批处理文件，如标准的C程序，参数0包含路径到当前执行脚本。您可以使用％〜DP0 只得到第0参数的路径部分（这是当前脚本） - 这条道路始终是一个完全合格的路径

In batch files, as in standard C programs, argument 0 contains the path to the currently executing script. You can use %~dp0 to get only the path portion of the 0th argument (which is the current script) - this path is always a fully qualified path.

您还可以使用让你的第一个参数的完全合格的路径％〜F1 ，但根据当前工作目录，这显然不是这给路径你要什么。

You can also get the fully qualified path of your first argument by using %~f1, but this gives a path according to the current working directory, which is obviously not what you want.

就个人而言，我经常使用％〜DP0％〜1 成语在我的批处理文件，其中除$ P $首先相对于执行路径参数PT批量。它有一个缺点，虽然：如果第一个参数是完全合格的IT悲惨的失败了。

Personally, I often use the %~dp0%~1 idiom in my batch file, which interpret the first argument relative to the path of the executing batch. It does have a shortcoming though: it miserably fails if the first argument is fully-qualified.

如果您需要同时支持相对的和的绝对路径，你可以使用<一个href=\"http://stackoverflow.com/questions/1645843/batch-file-resolve-absolute-path-from-relative-path-and-or-file-name/4488734#4488734\">Frédéric梅内的解决方案：暂时改变当前的工作目录。

If you need to support both relative and absolute paths, you can make use of Frédéric Ménez's solution: temporarily change the current working directory.

下面是将演示每种技术的例子：

Here's an example that'll demonstrate each of these techniques:

@echo off
echo %%~dp0 is "%~dp0"
echo %%0 is "%0"
echo %%~dpnx0 is "%~dpnx0"
echo %%~f1 is "%~f1"
echo %%~dp0%%~1 is "%~dp0%~1"

rem Temporarily change the current working directory, to retrieve a full path 
rem   to the first parameter
pushd .
cd %~dp0
echo batch-relative %%~f1 is "%~f1"
popd

如果您在此保存为C：\\ TEMP \\ example.bat并从C运行它：\\用户\\公用为

If you save this as c:\temp\example.bat and the run it from c:\Users\Public as

C：\\用户\\公用> \\ TEMP \\ example.bat .. \\ WINDOWS

c:\Users\Public>\temp\example.bat ..\windows

...你会看到下面的输出：

...you'll observe the following output:

%~dp0 is "C:\temp\"
%0 is "\temp\example.bat"
%~dpnx0 is "C:\temp\example.bat"
%~f1 is "C:\Users\windows"
%~dp0%~1 is "C:\temp\..\windows"
batch-relative %~f1 is "C:\Windows"

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