libgo/go/io/ioutil/example_test.go

   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
   7 package ioutil_test
   8
   9 import (
  10         "fmt"
  11         "io/ioutil"
  12         "log"
  13         "os"
  14         "path/filepath"
  15         "strings"
  16 )
  17
  18 func 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
  32 func 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
  43 func 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
  58 func 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
  75 func 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 }