将注册表值读取到批处理变量中，处理值中的空格 [英] Reading a registry value to a batch variable, handling spaces in value
问题描述
我正在努力将注册表项的值读入变量.注册表值可以包含空格，也可以不包含空格.在这种情况下，我正在尝试查找SDK路径.
I'm struggling to read the value of a registry key into a variable. The registry value may, or may not, contain spaces. In this case I'm trying to look up SDK paths.
使用reg query可以很容易地获得值，但是它以非常无用的格式返回:
It's easy to get the value with reg query, but it's returned in a remarkably unhelpful format:
C:\Users\Administrator\Desktop>reg query "HKLM\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v7.1\WinSDKTools" /v InstallationFolder
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v7.1\WinSDKTools
InstallationFolder REG_SZ C:\Program Files\Microsoft SDKs\Windows\v7.1\bin\
键名，键类型和键值由一系列空格而不是制表符分隔.
The key name, key type, and key value are separated by a series of spaces, not tabs.
您认为您可以使用类似的东西:
You'd think you could use something like:
FOR /F "usebackq tokens=3* skip=2" %%L IN (
`reg query "HKLM\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v7.1\WinSDKTools" /v InstallationFolder`
) DO SET sdkpath=%%L
...但是如果键包含空格(在这种情况下)，则在命令行上发出的结果是:
... but if the key contains spaces, as in this case, the result emitted on the command line is:
C:\Users\Administrator\Desktop>SET sdkpath=C:\Program
这没有帮助.似乎没有通配符变量表示所有匹配项".而且你不能只写:
Which isn't helpful. There doesn't seem to be a wildcard variable to say "All matches". And you can't just write:
DO SET sdkpath=%%L %%M
...，因为如果路径中有 not 个空格，则将产生文字%M(并且还将产生尾随空格).
... because if there are not spaces in the path, that will produce a literal %M (and would also produce a trailing space).
所以.有没有办法在批处理文件中执行此简单操作?
So. Is there any way to do this simple thing in a batch file?
我已经在Powershell(和一些Perl)中编写了大部分工具，但是我需要使用批处理文件来执行简单"任务，即call编写visual studio/windows sdk环境脚本，然后调用设置好环境后，即可使用健全的语言编写代码.
I've written most of my tooling in Powershell (and some Perl), but I need to use a batch file for the "simple" task of calling the visual studio / windows sdk environment script and then invoking the code in sane languages once the environment is set up.
您会认为在cmd.exe存在十多年之后，并且在command.com之前，这很容易.帮助吗?
You'd think that after 10+ years of cmd.exe's existence, and command.com before it, this would be easy. Help?
(我可以使用Perl和Win32::包来查询注册表，但这并不能帮助我将其放入批处理变量中...)
(I can use Perl and the Win32:: packages to query the registry, but it doesn't help me get it into a batch var...)
使用Win2k12.
我读过:
- Read registry value that contains spaces using batch file
- Shell script reading windows registry
和许多其他方法，但没有一种方法能处理一般情况，该方法通常是在不知道键是否包含空格/多少的情况下从键中正确读取值的.
and many others, but none handle the general case of correctly reading a value from a key without knowing whether or not it contains spaces / how many.
推荐答案
啊，这是关于for /f命令的烦人的细节之一.为了读取所有字符，包括带有*的空格，需要声明上一个标记. tokens=2,*功能原因已在文档中说明.
Ah this is one of the annoying details about the for /f command. In order to read all the characters including the spaces with the * the previous token needs to be declared. tokens=2,* The functional reason is stated in the documentation.
如果tokens =字符串中的最后一个字符是星号(*)，则会分配一个附加变量，并在解析的最后一个令牌之后的行中接收其余文本.
If the last character in the tokens= string is an asterisk (*), an additional variable is allocated and receives the remaining text on the line after the last token that is parsed.
FOR /F "usebackq tokens=2,* skip=2" %%L IN (
`reg query "HKLM\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v7.1\WinSDKTools" /v InstallationFolder`
) DO SET sdkpath=%%M
这篇关于将注册表值读取到批处理变量中，处理值中的空格的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
