go数据类型和[]byte相互转换

go数据类型和[]byte相互转换

package main

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

func main() {

    var i1 int64 = 511 // [00000000 00000000 ... 00000001 11111111] = [0 0 0 0 0 0 1 255]

    s1 := make([]byte, 0)
    buf := bytes.NewBuffer(s1)

    // 数字转 []byte, 网络字节序为大端字节序
    binary.Write(buf, binary.BigEndian, i1)
    fmt.Println(buf.Bytes())

    // 数字转 []byte, 小端字节序
    buf.Reset()
    binary.Write(buf, binary.LittleEndian, i1)
    fmt.Println(buf.Bytes())

    // []byte 转 数字
    s2 := []byte{6: 1, 7: 255} // [0 0 0 0 0 0 1 255]
    buf = bytes.NewBuffer(s2)
    var i2 int64
    binary.Read(buf, binary.BigEndian, &i2)
    fmt.Println(i2)        // 511

    s3 := []byte{255, 1, 7:0}    // [255 1 0 0 0 0 0 0]
    buf = bytes.NewBuffer(s3)
    var i3 int64
    binary.Read(buf, binary.LittleEndian, &i3)
    fmt.Println(i3)        // 511

}