/
file.go
115 lines (95 loc) · 1.73 KB
/
file.go
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package main
import (
"bufio"
"fmt"
"io"
"os"
)
func main() {
//name := "f:/file.txt"
name := "e:/a.mp4"
//createFile(name)
//openFile(name)
//readFile(name)
//文件拷贝
copyName := "f:/a.mp4"
copyFile(name, copyName)
}
/**
文件拷贝
*/
func copyFile(file string, copyFile string) {
f_r, err := os.OpenFile(file, os.O_RDWR, 6)
if err != nil {
fmt.Println(err)
return
}
fmt.Println("open succ")
defer f_r.Close()
// 创建写文件
copyF, err := os.Create(copyFile)
if err != nil {
fmt.Println(err)
return
}
defer copyF.Close()
//从缓存区读取
buf := make([]byte, 4096)
for {
len, err := f_r.Read(buf)
if err != nil && err == io.EOF {
fmt.Printf("read length: %d\n", len)
break
}
copyF.Write(buf[:len])
}
fmt.Println("write finish!!!")
}
func createFile(file string) {
create, err := os.Create(file)
if err != nil {
fmt.Println(err)
return
}
defer create.Close()
fmt.Println("create succ")
}
func openFile(file string) {
f, err := os.OpenFile(file, os.O_RDWR, 6)
if err != nil {
fmt.Println(err)
return
}
fmt.Println("open succ")
defer f.Close()
seek, err := f.Seek(5, io.SeekStart)
fmt.Println(seek)
//writeString, err := f.WriteAt([]byte("44"), seek)
writeString, err := f.WriteString("33")
if err != nil {
fmt.Println(err)
}
fmt.Println("writeString", writeString)
}
func readFile(file string) {
f, err := os.OpenFile(file, os.O_RDWR, 6)
if err != nil {
fmt.Println(err)
return
}
fmt.Println("open succ")
defer f.Close()
reader := bufio.NewReader(f)
for {
bytes, err := reader.ReadBytes('1')
if err != nil {
if err == io.EOF {
fmt.Println("文件结束", err)
return
}
fmt.Println(err)
return
}
fmt.Println(string(bytes))
}
}