91_Go基础_1_59 file.Write

 1 package main
 2 
 3 import (
 4     "fmt"
 5     "log"
 6     "os"
 7 )
 8 
 9 func HandleErr(err error) {
10     if err != nil {
11         log.Fatal(err)
12     }
13 }
14 
15 func main() {
16     /*
17         写入数据：
18     */
19 
20     fileName := "D:\\Go\\web2\\aa.txt"
21     file, err := os.OpenFile(fileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, os.ModePerm)
22     HandleErr(err)
23     defer file.Close()
24 
25     // 写入数据
26     bs := []byte{97, 98, 99, 100} //a,b,c,d
27     n, err := file.Write(bs[:2])  // n,err := file.Write(bs)
28     fmt.Println(n)                // 2
29     HandleErr(err)
30     file.WriteString("\n")
31 
32     // 直接写入字符串
33     n, err = file.WriteString("HelloWorld")
34     fmt.Println(n) // 10
35     HandleErr(err)
36 
37     file.WriteString("\n")
38     n, err = file.Write([]byte("today"))
39     fmt.Println(n) // 5
40     HandleErr(err)
41 
42 }