num-derive crate是生成枚举的FromPrimitive trait所必需的。话虽如此，可以使用num-enum crate实现相同的功能。它提供了对枚举数据类型的进一步控制，可能很有用。这里是关于这个话题的讨论。

示例

use byteme::ByteMe;
pub use num_derive::FromPrimitive;


#[derive(Debug, FromPrimitive)]
pub enum Mode {
  Unavailable = 0,
  Unauthenticated = 1,
  Authenticated = 2,
  Encrypted = 4,
}

#[derive(ByteMe, Debug)]
pub struct FrameOne {
  pub unused: [u8; 12],
  #[byte_me(u32)]
  pub mode: Mode,
  pub challenge: [u8; 16],
  pub salt: [u8; 16],
  pub count: u32,
  pub mbz: [u8; 12],
};

let frame = FrameOne {
  unused: [0; 12],
  mode: Mode::Authenticated,
  challenge: [0; 16],
  salt: [0; 16],
  count: 1024,
  mbz: [0; 12],
};

let size = FrameOne::SIZE; // Get the number of bytes in the frame
let bytes: Vec<u8> = frame.into(); // Converts the frame into vector of bytes
let frame: FrameOne = bytes.into(); // Converts the bytes back to frame

许可证：Apache-2.0