如何在vbs中设置可以在调用批处理脚本时读取的环境变量 [英] How to set environment variables in vbs that can be read in calling batch script

问题描述

我有一个调用 vbscript 文件的批处理文件.我试图让 vbscript 文件更改稍后在调用 vbscript 文件的批处理文件中使用的环境变量.

I have a batch file that calls a vbscript file. I am trying to have the vbscript file change an environment variable that is later used in the batch file that calls the vbscript file.

这里是文件的片段.

父.bat

Set Value="Initial Value"
cscript Child.vbs
ECHO Value = %VALUE%

Child.vbs

Set wshShell = CreateObject( "WScript.Shell" )
Set wshSystemEnv = wshShell.Environment( "Process" )
wshSystemEnv("VALUE") = "New Value"

推荐答案

你不能.一个进程可以将环境变量传递给子进程，但不能传递给它的父进程——在这种情况下，父进程是 cmd.exe，它运行着你的 Parent.bat 文件.

You can't. A process can pass environment variables to child processes, but not to its parent - and in this case the parent is cmd.exe, which is running your Parent.bat file.

当然还有其他方式将信息传递回父批处理文件 - 输出到标准输出或文件是一种显而易见的方式，例如

There are of course other ways to communicate information back to the parent batch file - outputting to stdout or a file is an obvious way, e.g.

== Child.vbs ===
WScript.echo "New Value"

== Parent.cmd ===
for /f "tokens=*" %%i in ('cscript //nologo child.vbs') do set Value=%%i
echo %Value%

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