1// Copyright 2015 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// +build ignore 6 7package ioutil_test 8 9import ( 10 "fmt" 11 "io/ioutil" 12 "log" 13 "os" 14 "path/filepath" 15 "strings" 16) 17 18func ExampleReadAll() { 19 r := strings.NewReader("Go is a general-purpose language designed with systems programming in mind.") 20 21 b, err := ioutil.ReadAll(r) 22 if err != nil { 23 log.Fatal(err) 24 } 25 26 fmt.Printf("%s", b) 27 28 // Output: 29 // Go is a general-purpose language designed with systems programming in mind. 30} 31 32func ExampleReadDir() { 33 files, err := ioutil.ReadDir(".") 34 if err != nil { 35 log.Fatal(err) 36 } 37 38 for _, file := range files { 39 fmt.Println(file.Name()) 40 } 41} 42 43func ExampleTempDir() { 44 content := []byte("temporary file's content") 45 dir, err := ioutil.TempDir("", "example") 46 if err != nil { 47 log.Fatal(err) 48 } 49 50 defer os.RemoveAll(dir) // clean up 51 52 tmpfn := filepath.Join(dir, "tmpfile") 53 if err := ioutil.WriteFile(tmpfn, content, 0666); err != nil { 54 log.Fatal(err) 55 } 56} 57 58func ExampleTempFile() { 59 content := []byte("temporary file's content") 60 tmpfile, err := ioutil.TempFile("", "example") 61 if err != nil { 62 log.Fatal(err) 63 } 64 65 defer os.Remove(tmpfile.Name()) // clean up 66 67 if _, err := tmpfile.Write(content); err != nil { 68 log.Fatal(err) 69 } 70 if err := tmpfile.Close(); err != nil { 71 log.Fatal(err) 72 } 73} 74 75func ExampleReadFile() { 76 content, err := ioutil.ReadFile("testdata/hello") 77 if err != nil { 78 log.Fatal(err) 79 } 80 81 fmt.Printf("File contents: %s", content) 82 83 // Output: 84 // File contents: Hello, Gophers! 85} 86