The Io/ioutil package in Golang

This is a creation in Article, where the information may have evolved or changed.

Several function methods

Name	Role	Note
ReadAll	Reads the data, returns the read byte slice	1
ReadDir	Reads a directory and returns an array of directory entries []os. FileInfo,	2
ReadFile	Reads a file, returns the contents of the file (byte slice)	3
WriteFile	Write bytes Slice According to the file path	4
TempDir	Creates a temporary directory with the specified prefix name in a directory, returning the path to the new temporary directory	5
Tempfile	Creates a temporary file of the specified prefix name in a directory, returning to the OS. File	6

Example

ReadAll

func ReadAll(r io.Reader) ([]byte, error)

r := strings.NewReader("Go is a general-purpose language designed with systems programming in mind.")b, err := ioutil.ReadAll(r)if err != nil {    log.Fatal(err)}fmt.Printf("%s", b)/*output:Go is a general-purpose language designed with systems programming in mind.*/

ReadDir

func ReadDir(dirname string) ([]os.FileInfo, error)

files, err := ioutil.ReadDir(".")if err != nil {    log.Fatal(err)}for _, file := range files {    fmt.Println(file.Name())}

WriteFile

func WriteFile(filename string, data []byte, perm os.FileMode) error