example_test.go

Documentation: encoding/gob

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package gob_test
     6  
     7  import (
     8  	"bytes"
     9  	"encoding/gob"
    10  	"fmt"
    11  	"log"
    12  )
    13  
    14  type P struct {
    15  	X, Y, Z int
    16  	Name    string
    17  }
    18  
    19  type Q struct {
    20  	X, Y *int32
    21  	Name string
    22  }
    23  
    24  // This example shows the basic usage of the package: Create an encoder,
    25  // transmit some values, receive them with a decoder.
    26  func Example_basic() {
    27  	// Initialize the encoder and decoder. Normally enc and dec would be
    28  	// bound to network connections and the encoder and decoder would
    29  	// run in different processes.
    30  	var network bytes.Buffer        // Stand-in for a network connection
    31  	enc := gob.NewEncoder(&network) // Will write to network.
    32  	dec := gob.NewDecoder(&network) // Will read from network.
    33  
    34  	// Encode (send) some values.
    35  	err := enc.Encode(P{3, 4, 5, "Pythagoras"})
    36  	if err != nil {
    37  		log.Fatal("encode error:", err)
    38  	}
    39  	err = enc.Encode(P{1782, 1841, 1922, "Treehouse"})
    40  	if err != nil {
    41  		log.Fatal("encode error:", err)
    42  	}
    43  
    44  	// Decode (receive) and print the values.
    45  	var q Q
    46  	err = dec.Decode(&q)
    47  	if err != nil {
    48  		log.Fatal("decode error 1:", err)
    49  	}
    50  	fmt.Printf("%q: {%d, %d}\n", q.Name, *q.X, *q.Y)
    51  	err = dec.Decode(&q)
    52  	if err != nil {
    53  		log.Fatal("decode error 2:", err)
    54  	}
    55  	fmt.Printf("%q: {%d, %d}\n", q.Name, *q.X, *q.Y)
    56  
    57  	// Output:
    58  	// "Pythagoras": {3, 4}
    59  	// "Treehouse": {1782, 1841}
    60  }
    61
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