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Source file src/io/ioutil/example_test.go

Documentation: io/ioutil

  // Copyright 2015 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package ioutil_test
  
  import (
  	"fmt"
  	"io/ioutil"
  	"log"
  	"os"
  	"path/filepath"
  	"strings"
  )
  
  func ExampleReadAll() {
  	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.
  }
  
  func ExampleReadDir() {
  	files, err := ioutil.ReadDir(".")
  	if err != nil {
  		log.Fatal(err)
  	}
  
  	for _, file := range files {
  		fmt.Println(file.Name())
  	}
  }
  
  func ExampleTempDir() {
  	content := []byte("temporary file's content")
  	dir, err := ioutil.TempDir("", "example")
  	if err != nil {
  		log.Fatal(err)
  	}
  
  	defer os.RemoveAll(dir) // clean up
  
  	tmpfn := filepath.Join(dir, "tmpfile")
  	if err := ioutil.WriteFile(tmpfn, content, 0666); err != nil {
  		log.Fatal(err)
  	}
  }
  
  func ExampleTempFile() {
  	content := []byte("temporary file's content")
  	tmpfile, err := ioutil.TempFile("", "example")
  	if err != nil {
  		log.Fatal(err)
  	}
  
  	defer os.Remove(tmpfile.Name()) // clean up
  
  	if _, err := tmpfile.Write(content); err != nil {
  		log.Fatal(err)
  	}
  	if err := tmpfile.Close(); err != nil {
  		log.Fatal(err)
  	}
  }
  
  func ExampleReadFile() {
  	content, err := ioutil.ReadFile("testdata/hello")
  	if err != nil {
  		log.Fatal(err)
  	}
  
  	fmt.Printf("File contents: %s", content)
  
  	// Output:
  	// File contents: Hello, Gophers!
  }
  

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