Go 整数 大小端处理

// Mybinary project main.go
package main

import (
	"bytes"
	"encoding/binary"
	"log"
	"reflect"
	"strconv"
)

func main() {
	/* 有符号数 */
	num := int32(123456)
	log.Println(reflect.TypeOf(num)) //显示类型

	buf := bytes.NewBuffer([]byte{})
	err := binary.Write(buf, binary.BigEndian, num) //大端
	if err != nil {
		log.Panicln(err.Error())
	}
	log.Println("num = ", num, "byte BigEndian =>", buf.Bytes())

	buf.Reset()
	err = binary.Write(buf, binary.LittleEndian, num) //小端
	if err != nil {
		log.Panicln(err.Error())
	}
	log.Println("num = ", num, "byte LittleEndian =>", buf.Bytes())

	/* 通过 Put 方式实现 */
	var num2 uint32 = 123456
	buf2 := make([]byte, 4)
	binary.BigEndian.PutUint32(buf2, num2) //大端
	log.Println("num2 = ", num2, "byte BigEndian =>", buf2)

	buf2 = nil
	buf2 = make([]byte, 4)
	binary.LittleEndian.PutUint32(buf2, num2) //小端
	log.Println("num2 = ", num2, "byte LittleEndian =>", buf2)

	num3 := 987654321
	bsnum := []byte(strconv.Itoa(num3))
	log.Println("num3 = ", num3, "bsnum = ", bsnum)
	log.Println("string(bsnum[0]) = ", string(bsnum[0]))
}

输出:

C:/Go/bin/go.exe build -i [D:/golang/src/Mybinary]
成功: 进程退出代码 0.
D:/golang/src/Mybinary/Mybinary.exe  [D:/golang/src/Mybinary]
2018/02/07 19:51:22 int32
2018/02/07 19:51:22 num =  123456 byte BigEndian => [0 1 226 64]
2018/02/07 19:51:22 num =  123456 byte LittleEndian => [64 226 1 0]
2018/02/07 19:51:22 num2 =  123456 byte BigEndian => [0 1 226 64]
2018/02/07 19:51:22 num2 =  123456 byte LittleEndian => [64 226 1 0]
2018/02/07 19:51:22 num3 =  987654321 bsnum =  [57 56 55 54 53 52 51 50 49]
2018/02/07 19:51:22 string(bsnum[0]) =  9
成功: 进程退出代码 0.