Forked from novalagung/golang-create-read-write-delete-file.go
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October 18, 2019 01:23
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package main | |
import ( | |
"fmt" | |
"io" | |
"os" | |
) | |
var path = "/Users/novalagung/Documents/temp/test.txt" | |
func main() { | |
createFile() | |
writeFile() | |
readFile() | |
deleteFile() | |
} | |
func createFile() { | |
// detect if file exists | |
var _, err = os.Stat(path) | |
// create file if not exists | |
if os.IsNotExist(err) { | |
var file, err = os.Create(path) | |
checkError(err) //okay to call os.exit() | |
defer file.Close() | |
} | |
} | |
func writeFile() { | |
// open file using READ & WRITE permission | |
var file, err = os.OpenFile(path, os.O_RDWR, 0644) | |
checkError(err) | |
defer file.Close() | |
// write some text to file | |
_, err = file.WriteString("halo\n") | |
if err != nil { | |
fmt.Println(err.Error()) | |
return //must return here for defer statements to be called | |
} | |
_, err = file.WriteString("mari belajar golang\n") | |
if err != nil { | |
fmt.Println(err.Error()) | |
return //same as above | |
} | |
// save changes | |
err = file.Sync() | |
if err != nil { | |
fmt.Println(err.Error()) | |
return //same as above | |
} | |
} | |
func readFile() { | |
// re-open file | |
var file, err = os.OpenFile(path, os.O_RDWR, 0644) | |
checkError(err) | |
defer file.Close() | |
// read file | |
var text = make([]byte, 1024) | |
n, err := file.Read(text) | |
if n > 0 { | |
fmt.Println(string(text)) | |
} | |
//if there is an error while reading | |
//just print however much was read if any | |
//at return file will be closed | |
} | |
func deleteFile() { | |
// delete file | |
var err = os.Remove(path) | |
checkError(err) | |
} | |
func checkError(err error) { | |
if err != nil { | |
fmt.Println(err.Error()) | |
os.Exit(0) | |
} | |
} |
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