CODEWITHSUNDEEP
windowsrust
masteronin99
masteronin99

Reputation: 304

Is there a way to set environment variables for Windows

I am building a command-line application and I am using rust...

I know how to set system environment variables using a batch script, but I want to implement everything in rust, so is there a way to set environment variables for Windows using rust.

I tried set_var(KEY) but it only works for the currently running process...

Upvotes: 3

Views: 3731

Answers (2)

menjaraz
menjaraz

Reputation: 7575

To whom it may concern: Setting a system-wide environment variable is quite similar...

use winreg::{RegKey, HKEY_LOCAL_MACHINE};

fn main() {
    let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
    let env_key = hklm.create_subkey("System\\CurrentControlSet\\Control\\Session Manager\\Environment").unwrap();
    env_key.set_value("MY_VAR", "my_value").unwrap();
}

Always remember: Modifying the registry requires administrative privileges.

Upvotes: 0

Mac O'Brien
Mac O'Brien

Reputation: 2917

You'll need to use the registry to do this, so a necessary disclaimer: using the registry incorrectly can mess up your system.

On Windows, user environment variables are stored in HKEY_CURRENT_USER\Environment\. The Rust library winreg makes this pretty straightforward:

use winreg::{enums::*, RegKey};

fn main() {
    let hkcu = RegKey::predef(HKEY_CURRENT_USER);
    let (env, _) = hkcu.create_subkey("Environment").unwrap(); // create_subkey opens with write permissions
    env.set_value("TestVar", &"TestValue").unwrap();
}

Upvotes: 4

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