golang -- 网络字节编解码(2)

以下是利用标准库binary来进行编解码

• 解码
  ①使用bytes.NewReader/bytes.Buffer来存储要解码的ascii串
  ②使用binary.Read来解码
  

  packagemain
  
  import(
  "bytes"
  "encoding/binary"
  "fmt"
  )
  
  funcmain(){
  varpifloat64
  bpi:=[]byte{0x18,0x2d,0x44,0x54,0xfb,0x21,0x09,0x40}
  buf:=bytes.NewReader(bpi)
  err:=binary.Read(buf,binary.LittleEndian,&pi)
  //这里可以继续读出来存在变量里,这样就可以解码出来很多,读的次序和变量类型要对
  //binary.Read(buf,binary.LittlEndian,&v2)
  iferr!=nil{
  fmt.Println("binary.ReadFailed:",err)
  }
  fmt.Print(pi)
  //3.141592653589793
  }

  
  

• 编码
  ①使用bytes.Buffer来存储编码生成的串
  ②使用binary.Write来编码存储在①的buf中
  

  packagemain
  
  import(
  "bytes"
  "encoding/binary"
  "fmt"
  )
  
  funcmain(){
  varpifloat64=3.141592653589793
  buf:=new(bytes.Buffer)
  err:=binary.Write(buf,pi)
  //这里可以继续往buf里写,都存在buf里
  //binary.Write(buf,uint16(12345))
  iferr!=nil{
  fmt.Println("binary.ReadFailed:",err)
  }
  fmt.Print(buf.Bytes())
  //[2445688425133964]
  
  }

Multi模式

• 解码
  

  ing

• 编码

  packagemain
  
  import(
  "bytes"
  "encoding/binary"
  "fmt"
  )
  
  funcmain(){
  buf:=new(bytes.Buffer)
  vardata=[]interface{}{
  uint16(61374),int8(-54),uint8(254),}
  for_,v:=rangedata{
  err:=binary.Write(buf,v)
  iferr!=nil{
  fmt.Println("binary.WriteFailed:",err)
  }
  }
  fmt.Printf("%x",buf.Bytes())
  //beefcafe这个是16进制串
  //这里转换为了16进制整数的串?
  }