CMD下执行Go乱码

go run ttypemain.go

Pinging  [127.0.0.1] with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

package main

import (
 "bufio"
 "fmt"
 "golang.org/x/text/encoding/simplifiedchinese"
 "os/exec"
)

type Charset string

const (
 UTF8    = Charset("UTF-8")
 GB18030 = Charset("GB18030")
)

func main() {
 command := "ping"
 params := []string{"127.0.0.1","-t"}
 cmd := exec.Command(command, params...)
 stdout, err := cmd.StdoutPipe()
 if err != nil {
  fmt.Println(err)
  return
 }
 cmd.Start()
 in := bufio.NewScanner(stdout)
 for in.Scan() {
  cmdRe:=ConvertByte2String(in.Bytes(),"GB18030")
  fmt.Println(cmdRe)
 }
 cmd.Wait()
}

func ConvertByte2String(byte []byte, charset Charset) string {
 var str string
 switch charset {
 case GB18030:
  var decodeBytes,_=simplifiedchinese.GB18030.NewDecoder().Bytes(byte)
  str= string(decodeBytes)
 case UTF8:
  fallthrough
 default:
  str = string(byte)
 }
 return str
}