rust 终端输出 debug 信息

配置方法

• 将 env_logger log 添加到 Cargo.toml ：
  打开 Cargo.toml 文件并在 [dependencies] 部分下添加 env_logger log 。

[package]
name = "helloworld"
version = "0.1.0"
edition = "2021"

[dependencies]
log = "0.4"
env_logger = "0.10"

• 导入 env_logger log crate：
  确保将 env_logger log crate导入到 main.rs 或 lib.rs 文件中。

use env_logger;
use log::debug;

• 如果终端没有输出，可能是日志级别配置的问题。默认情况下， env_logger 可能不显示调试级别日志。需要设置适当的环境变量来配置日志级别。
  在 Linux 和 macOS 上：

export RUST_LOG=debug

在 Windows 上（命令提示符）：

set RUST_LOG=debug

在 Windows 上（PowerShell）：

$env:RUST_LOG="debug"

完整示例

[package]
name = "helloworld"
version = "0.1.0"
edition = "2021"

[dependencies]
rand = "0.8.5"
log = "0.4"
env_logger = "0.10"

#[warn(unused_imports)]
use log::{debug, error, log_enabled, info, Level};
use env_logger;

fn process_serial_data(n: usize, serial_buf: &[u8]) {
    // Log the number of bytes received and the data in hexadecimal format
    debug!("rx: {}, {:02X?}", n, &serial_buf[..n]);

    // Other processing logic...
}

fn main() {
    // Initialize the logger
    env_logger::init();

    debug!("this is a debug {}", "message");
    // error!("this is printed by default");

    // Example data
    let n = 4;
    let serial_buf = vec![0xDE, 0xAD, 0xBE, 0xEF, 0x00, 0x01];

    // Process the data
    process_serial_data(n, &serial_buf);
}

输出

Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
 Running `target/debug/helloworld`
[2024-06-26T01:29:31Z DEBUG helloworld] this is a debug message
[2024-06-26T01:29:31Z DEBUG helloworld] rx: 4, [DE, AD, BE, EF]