如何从C ++更改Windows shell（cmd.exe）环境变量？ [英] How can I change Windows shell (cmd.exe) environment variables from C++?

问题描述

我想编写一个程序，在从其调用的shell（cmd.exe）的实例中设置环境变量。这个想法是我可以在这个变量中存储一些状态，然后在后续调用中再次使用它。

I would like to write a program that sets an environment variable in an instance of the shell (cmd.exe) it was called from. The idea is that I could store some state in this variable and then use it again on a subsequent call.

我知道有像SetEnvironmentVariable这样的命令，但我的理解是，这些只改变当前进程的变量，不会修改调用shell的变量。

I know there are commands like SetEnvironmentVariable, but my understanding is that those only change the variable for the current process and won't modify the calling shell's variables.

具体来说，我想要做的是创建一个可以在两个目录之间反弹的命令。 Pushd / Popd可以转到目录并返回，但没有办法第二次返回到最初推送的目录。

Specifically what I would like to be able to do is create a command that can bounce between two directories. Pushd/Popd can go to a directory and back, but don't have a way of returning a 2nd time to the originally pushed directory.

推荐答案

一个常见的技术是编写一个env文件，然后从脚本中调用。

A common techniques is the write an env file, that is then "call"ed from the script.

del env.var
foo.exe ## writes to env.var
call env.var

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