嵌套环境变量 [英] Nested environment variables

问题描述

我正在尝试创建一个注册要求您输入用户名和密码的文件.注册时，密码保存在变量中.

I am trying to make a file that asks for your username and password, with a registration. When registering, the passwords are saved in variables.

问题是我必须为这些变量设置名称，这些名称将在您写下用户名时输入.例如，我需要用户"john"的密码.用户写下用户名john时，会将其存储在变量％user1％中.由于我需要创建一个变量％johnpass％和"john" = ％user1％，因此我必须创建一个名为 %% user1％pass％的变量(变量内含一个变量.疯狂！)

The problem is i have to set names for those variables, names that would be input when you write your username down. for example, i need a password for the user "john". When the username john is written down by a user, it is stocked in a variable, %user1%. As i need to make a variable %johnpass% and "john"= %user1%, i have to therefore make a variable called %%user1%pass% (Variable INSIDE a variable.CRAZY!)

还有另一种方法吗?

简单版本:

1. 用户输入用户名"john"
2. "john"保存在变量％user1％
中
3. 他写了一个密码"1q2p"
4. 如何将密码保存在变量中:％user1％的密码
5. %% user1％pass％不起作用

1. User writes username "john"
2. "john" is saved in a variable, %user1%
3. he writes a password "1q2p"
4. how can i save this password in a variable: which would be: %user1%'s password
5. %%user1%pass% is not working

我真的很想找出答案！如果您有用于注册和登录的脚本，请告诉！！！预先感谢.

I really want to find out! If you have a script for registration and login, please tell!!! Thanks in advance.

推荐答案

您的方法有一个重要的缺点:您如何知道要管理多少个不同的变量?您如何知道下一个用户将使用 user2 变量和下一个 user3 ?您必须同意，如果只有一个用户，则password变量不需要用户名，并且可以被命名为 pass ，对吗?

You method have an important drawback: How do you know how many different variables are you managing? How do you know that the next user will use user2 variable and the next one user3? You must agree that if there is just one user then password variable don't require the user name and could be named just pass, right?

处理这种情况的标准方法是通过 array :您使用具有相同名称(数组)的变量，并通过<下标.在您的情况下，您可能有两个数组: user 和 pass ，它们都具有从1开始的相同数字下标.例如:

The standard method to deal with this situation is via an array: you use a variable with same name (the array) and select different values from it via a subscript. In your case, you may have two arrays: user and pass, both with the same numeric subscript starting from 1. For example:

@echo off
setlocal EnableDelayedExpansion
set index=0

:nextUser
set /A index+=1
set /P "user[%index%]=Username: "
set /P "pass[%index%]=Password: "

rem Display data of user[1]:
echo %user[1]%'s password is %pass[1]%

rem Display data of all users, from 1 to %index%
for /L %%i in (1,1,%index%) do (
   echo !user[%%i]!'s password is !pass[%%i]!
)

您可以在这篇文章中阅读批处理文件中有关阵列管理的详细说明:数组，链接列表和cmd.exe(批处理)脚本中的其他数据结构

You may read a detailed description about array management in Batch files at this post: Arrays, linked lists and other data structures in cmd.exe (batch) script

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