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golang文件读取-按指定BUFF大小读取
a.txt文件内容:
ABCDEFGHI
HELLO GOLANG
package main
import (
"fmt"
"os"
"io"
)
func main() {
fileName := "C:\\Robert\\日志分析\\tools_go\\vdn_sqlInterface\\a.txt"
file, err := os.OpenFile(fileName, os.O_RDWR, 0666)
if err != nil {
fmt.Println("Open file error!", err)
return
}
defer file.Close()
stat, err := file.Stat()
if err != nil {
panic(err)
}
var size = stat.Size()
fmt.Println("file size=", size)
// define read block size = 2
buf := make([]byte, 2)
for {
length, err := file.Read(buf)
if err != nil {
if err == io.EOF {
break
} else {
fmt.Println("Read file error!", err)
return
}
}
fmt.Println(length, string(buf))
}
fmt.Println("File read ok!")
}
输出:
每次读取2个字节的大小并输出
file size= 23
2 AB
2 CD
2 EF
2 GH
2 I
2
H
2 EL
2 LO
2 G
2 OL
2 AN
1 GN
File read ok!