[GO] C言語みたいにバイナリを構造体にキャスト

main.go

package main

import (
	"bytes"
	"encoding/binary"
	"encoding/hex"
	"fmt"
	"unsafe"
)

type ST struct {
	V1    int32
	V2    uint32
	V3    [10]byte
	Dummy [6]byte
}

func main() {
	var buf bytes.Buffer
	binary.Write(&buf, binary.LittleEndian, int32(255))
	binary.Write(&buf, binary.LittleEndian, uint32(127))
	buf.WriteString("helloworld")
	buf.Write(make([]byte, 6))

	b := buf.Bytes()
	fmt.Println(hex.Dump(b))

	p := unsafe.Pointer(&b[0])
	s := (*ST)(p)

	fmt.Printf("%+v\n", s)

	/*
	   00000000  ff 00 00 00 7f 00 00 00  68 65 6c 6c 6f 77 6f 72  |........hellowor|
	   00000010  6c 64 00 00 00 00 00 00                           |ld......|

	   &{V1:255 V2:127 V3:[104 101 108 108 111 119 111 114 108 100] Dummy:[0 0 0 0 0 0]}
	*/
}