from_file

这是一个简单的便利功能，可以直接从文件路径反序列化Rust结构体或枚举。

它可以帮助您避免将字符串转换为文件路径，尝试读取内容并反序列化。它是一个围绕 serde 的包装器，因此您可以使用您通常所有功能 👍

链接

• crates.io上的from_file
• crates.io上的from_file_derive
• 文档

示例

#[derive(Deserialize, FromFile, Debug, PartialEq)]
struct Person {
    name: String,
    age: usize
}

// Now `Person` has a `from_file()` method that will read a file from
// disk and automatically attempt to deserialize it 👌
let p = Person::from_file("test/fixtures/person.json").expect("file -> Person");

println!("hey {}!", p.name);

包含导入和错误处理的完整示例

#[macro_use]
extern crate serde_derive;

#[macro_use]
extern crate from_file_derive;
extern crate from_file;

use from_file::FromFile;

#[derive(Deserialize, FromFile, Debug, PartialEq)]
struct Person {
    name: String,
    age: usize
}

fn main() {
    match Person::from_file("test/fixtures/person.json") {
        Ok(p) => println!("Got a Person from a file!"),
        Err(e) => eprintln!("{}", e)
    }
}

lib.rs:

此宏启用 derive(FromFile)，应与 from_file 一起使用

示例

#[macro_use]
extern crate serde_derive;
extern crate serde;

#[macro_use]
extern crate from_file_derive;
extern crate from_file;

use from_file::FromFile;

#[derive(Deserialize, FromFile)]
struct Person {
    name: String
}

fn main() {
    let path = "test/fixtures/person.json";
    let person = Person::from_file(path).expect("deserialize from file");
    assert_eq!(person.name, String::from("Shane"));
}