Write a variable data as binary

write_binary.go

package main

import (
	"fmt"
	"reflect"
	"unsafe"
)
type Elf64_Ehdr struct {
	e_ident     [16]uint8
	e_type      uint16
	e_machine   uint16
	e_ehsize    uint16
	e_phentsize uint16
	e_phnum     uint16
	e_shentsize uint16
	e_shnum     uint16
	e_shstrndx  uint16
}

func main() {
	//p := &Elf64_Ehdr{
	//	e_ident: [16]uint8{1,2,3},
	//	e_shstrndx: 4,
	//}
	var i int = 1
	var p *int = &i

	buf := ((*[unsafe.Sizeof(*p)]byte)(unsafe.Pointer(p)))[:]
	buf2 := toBuf(p)
	fmt.Printf("buf1=% x\n", buf)
	fmt.Printf("buf2=% x\n", buf2)
}

func toBuf(ifc interface{}) []byte {
	size := reflect.TypeOf(ifc).Elem().Size()
	addr := reflect.ValueOf(ifc).Pointer()

	type Slice struct {
		addr uintptr
		len  uintptr
		cap  uintptr
	}

	slice := Slice{
		addr: addr,
		len:  size,
		cap:  size,
	}
	pbuf := (*[]byte)(unsafe.Pointer(&slice))
	return *pbuf
}