Essential Go / gob
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package main
import (
"encoding/gob"
"os"
"log"
"fmt"
)
type User struct {
Username string
Password string
}
func writeToGob(path string, user *User) error {
file, err := os.Create(path)
if err != nil {
return err
}
encoder := gob.NewEncoder(file)
err = encoder.Encode(user)
if err != nil {
file.Close()
return err
}
return file.Close()
}
func write(path string, user *User) {
err := writeToGob(path, user)
if err != nil {
log.Fatalf("writeToGob() failed with '%s'\n", err)
}
st, err := os.Stat(path)
if err != nil {
log.Fatalf("os.Stat() failed with '%s'\n", err)
}
fmt.Printf("Wrote user struct to file '%s' of size %d.\n", path, st.Size())
}
func read(path string) {
user := User{}
file, err := os.Open(path)
if err != nil {
log.Fatalf("os.Open('%s') failed with '%s'\n", path, err)
}
defer file.Close()
decoder := gob.NewDecoder(file)
err = decoder.Decode(&user)
if err != nil {
log.Fatalf("decoder.Decode() failed with '%s'\n", err)
}
fmt.Printf("\nRead from '%s' user:\n%#v\n", path, user)
}
func main() {
user := User{
Username: "Angus",
Password: "1234",
}
path := "user.gob"
write(path, &user)
read(path)
}
Go
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