如何在编译时生成文本文件并将其内容包含在输出中？ [英] How do I generate a text file during compile time and include its content in the output?

问题描述

我正在尝试与如何做在编译时创建静态字符串。

use std::{env};
use std::path::Path;
use std::io::{Write, BufWriter};
use std::fs::File;

fn main() {
    let out_dir = env::var("OUT_DIR").unwrap();
    let dest_path = Path::new(&out_dir).join("file_path.txt");
    let mut f = BufWriter::new(File::create(&dest_path).unwrap());

    let long_string = dest_path.display();
    write!(f, "{}", long_string).unwrap();
}

main.rs

main.rs

fn main() {

    static LONG_STRING: &'static str = include_str!("file_path.txt");
    println!("{}", LONG_STRING);
}

货物建造我收到错误消息：

error: couldn't read src\file_path.txt: The system cannot find the file specified. (os error 2)
 --> src\main.rs:3:40
  |
3 |     static LONG_STRING: &'static str = include_str!("file_path.txt");
  |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

我可以看到文件是在

X:\source\github\rust-build-script-example\target\debug\build\rust-build-script-example-f2a03ef7abfd6b23\out\file_path.txt



1. 为了获得<$ c $，我必须使用什么环境变量而不是OUT_DIR？ c> file_path.txt 是否要输出到 src 目录？


2. 如果无法执行＃1 ，那么我如何在上述目录中 include_str！生成的文件而不用代码对其进行硬编码（因为该路径似乎具有随机生成的部分 rust -build-script-example-f2a03ef7abfd6b23 ）

1. What is the environment variable I have to use instead of OUT_DIR in order to get the file_path.txt to be output to the src directory?
2. If #1 is not possible, then how do I include_str! the generated file in the above directory without hardcoding it in code (since the path seems to have a randomly generated partial rust-build-script-example-f2a03ef7abfd6b23 in it)

我的GitHub存储库

推荐答案

诀窍是

concat!(env!("OUT_DIR"), "/file_path.txt")

我按如下所示更改了main.rs并成功了。

I changed my main.rs as follows and it worked.

fn main() {

    static LONG_STRING: &'static str = include_str!(concat!(env!("OUT_DIR"), "/file_path.txt"));

    println!("{}", LONG_STRING);
}

以下crates.io文档提供了帮助

The following crates.io documentation helped

http://doc.crates.io/build-script.html

https://doc.rust-lang.org/cargo/reference/environment-variables.html

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