如何将类型转换为字节数组golang

Question

如何将一种类型转换为字节数组

这是工作示例

package main

import (

    "bytes"

    "fmt"

    "reflect"

)

type Signature [5]byte

const (

    /// Number of bytes in a signature.

    SignatureLength = 5

)

func main() {

    var bytes0to64 Signature = SignatureFromBytes([]byte("Here is a string.........."))

    fmt.Println(reflect.TypeOf(bytes0to64))

    res := bytes.Compare([]byte("Test"), bytes0to64)

    if res == 0 {

        fmt.Println("!..Slices are equal..!")

    } else {

        fmt.Println("!..Slice are not equal..!")

    }

}

func SignatureFromBytes(in []byte) (out Signature) {

    byteCount := len(in)

    if byteCount == 0 {

        return

    }

    max := SignatureLength

    if byteCount < max {

        max = byteCount

    }

    copy(out[:], in[0:max])

    return

}

在 Go 语言中定义

type Signature [5]byte

所以这是预期的

var bytes0to64 Signature = SignatureFromBytes([]byte("Here is a string.........."))

    fmt.Println(reflect.TypeOf(bytes0to64))

它只是将类型输出到

main.Signature

这是正确的，现在我想从中获取字节数组以进行下一级处理并得到编译错误

./prog.go:23:29: cannot use bytes0to64 (type Signature) as type []byte in argument to bytes.Compare

Go build failed.

错误是正确的，只是比较时不匹配。现在我应该如何将签名类型转换为字节数组

Answer 1

由于Signature是一个字节数组，您可以简单地将其切片：bytes0to64[:]这将导致值为[]byte。测试它：res := bytes.Compare([]byte("Test"), bytes0to64[:])if res == 0 {&nbsp; &nbsp; fmt.Println("!..Slices are equal..!")} else {&nbsp; &nbsp; fmt.Println("!..Slice are not equal..!")}res = bytes.Compare([]byte{72, 101, 114, 101, 32}, bytes0to64[:])if res == 0 {&nbsp; &nbsp; fmt.Println("!..Slices are equal..!")} else {&nbsp; &nbsp; fmt.Println("!..Slice are not equal..!")}这将输出（在Go Playground上尝试）：!..Slice are not equal..!!..Slices are equal..!