2022-06-13：golang中，[]byte和结构体如何相互转换？

package main

import (
	"encoding/binary"
	"fmt"
	"reflect"
	"unsafe"
)

func main() {
	type Foo struct {
		a int64
		b int32
		c byte
	}

	foo := Foo{
		a: 321,
		b: 654,
		c: 87,
	}

	data := (*[unsafe.Sizeof(foo)]byte)(unsafe.Pointer(&foo))[:]
	fmt.Printf("% x\n", data)
	// Output: 41 01 00 00 00 00 00 00 8e 02 00 00 57 00 00 00

	binary.LittleEndian.PutUint64(data[unsafe.Offsetof(Foo{}.a):], 123)
	binary.LittleEndian.PutUint32(data[unsafe.Offsetof(Foo{}.b):], 456)
	data[unsafe.Offsetof(Foo{}.c)] = 78

	foo2 := (*Foo)(unsafe.Pointer((*reflect.SliceHeader)(unsafe.Pointer(&data)).Data))

	fmt.Println(foo2)
	// Output: &{123 456 78}
	fmt.Println(foo)
	// Output: {123 456 78}
}

我不确定题意是不是要这么干。