如果是从裸指针直接转为 []byte 数组接收，会出现异常，需要准备 []byte 的底层结构再行转换
https://stackoverflow.com/questions/43591047/converting-a-pointer-to-a-byte-slice
https://play.golang.org/p/An7jG5xl2W
package main
import (
"fmt"
"reflect"
"unsafe"
)
var data = []byte(`foobar`)
func main() {
rv := reflect.ValueOf(data)
ptr := rv.Pointer()
length := rv.Len()
var sl = struct {
addr uintptr
len int
cap int
}{ptr, length, length}
b := *(*[]byte)(unsafe.Pointer(&sl))
fmt.Println(string(b))
}