golang example_encdec_test 代码
文件路径：/src/encoding/gob/example_encdec_test.go
/ Copyright 2013 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
package gob_test
import (
"bytes"
"encoding/gob"
"fmt"
"log"
)
/ The Vector type has unexported fields, which the package cannot access.
/ We therefore write a BinaryMarshal/BinaryUnmarshal method pair to allow us
/ to send and receive the type with the gob package. These interfaces are
/ defined in the "encoding" package.
/ We could equivalently use the locally defined GobEncode/GobDecoder
/ interfaces.
type Vector struct {
x, y, z int
}
func (v Vector) MarshalBinary() ([]byte, error) {
/ A simple encoding: plain text.
var b bytes.Buffer
fmt.Fprintln(&b, v.x, v.y, v.z)
return b.Bytes(), nil
}
/ UnmarshalBinary modifies the receiver so it must take a pointer receiver.
func (v *Vector) UnmarshalBinary(data []byte) error {
/ A simple encoding: plain text.
b := bytes.NewBuffer(data)
_, err := fmt.Fscanln(b, &v.x, &v.y, &v.z)
return err
}
/ This example transmits a value that implements the custom encoding and decoding methods.
func Example_encodeDecode() {
var network bytes.Buffer / Stand-in for the network.
/ Create an encoder and send a value.
enc := gob.NewEncoder(&network)
err := enc.Encode(Vector{3, 4, 5})
if err != nil {
log.Fatal("encode:", err)
}
/ Create a decoder and receive a value.
dec := gob.NewDecoder(&network)
var v Vector
err = dec.Decode(&v)
if err != nil {
log.Fatal("decode:", err)
}
fmt.Println(v)
/ Output:
/ {3 4 5}
}