Golang : Saving(serializing) and reading file with GOB

Golang has a package ( GOB ) that allows developers to store memory values( such as int[], float64[] or any kind of structs ) into files for storage, store in a database, transmit over a network or processing the data with another program. Saving memory values to file is also known as serializing Golang objects. In this tutorial, we will learn how to serialize int[] values to a file in a program and retrieve the int[] values from another program.

savefilegob.go

 package main

 import (
  "encoding/gob"
  "fmt"
  "os"
 )

 func main() {
  data := []int{101, 102, 103}

  // create a file
  dataFile, err := os.Create("integerdata.gob")

  if err != nil {
 fmt.Println(err)
 os.Exit(1)
  }

 // serialize the data
  dataEncoder := gob.NewEncoder(dataFile)
  dataEncoder.Encode(data)

  dataFile.Close()
 }

and retrieve the serialized objects or values:

readfilegob.go

 package main

 import (
  "encoding/gob"
  "fmt"
  "os"
 )

 func main() {
  var data []int

  // open data file
  dataFile, err := os.Open("integerdata.gob")

  if err != nil {
 fmt.Println(err)
 os.Exit(1)
  }

  dataDecoder := gob.NewDecoder(dataFile)
  err = dataDecoder.Decode(&data)

  if err != nil {
 fmt.Println(err)
 os.Exit(1)
  }

  dataFile.Close()

  fmt.Println(data)
 }

Output :

[101 102 103]

References :

http://golang.org/pkg/encoding/gob/

https://socketloop.com/references/golang-encoding-gob-encoder-encode-function-example

https://www.socketloop.com/references/golang-encoding-gob-newencoder-function-examples