从文本文件中删除前N个字节 [英] delete first N bytes from a text file
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问题描述
是否有任何函数调用或简单的方法可以从golang的文本文件中删除前N个字节?假设该文件被各种go例程有争议地附加,我同时想删除该文件的前N个字节.
Is there any function call or simple way to delete first N bytes from a text file in golang? Assuming that the file is contentiously appended by various go-routines, simultaneously I want to delete first N bytes of file.
推荐答案
您需要执行f.Seek
来跳过第一个字节,然后进行常规读取,请参见示例:
You need to do f.Seek
to jump over first bytes and than do regular reading, see example:
package main
import (
"fmt"
"io"
"io/ioutil"
"os"
)
func main() {
f, err := os.Open(os.Args[1]) // open file from argument
if err != nil {
fmt.Println(err)
return
}
var skipBytes int64 = 5 // how many bytes to skip
_, err = f.Seek(skipBytes, io.SeekStart) // skipping first bytes
if err != nil {
fmt.Println(err)
return
}
buffer := make([]byte, 1024) // allocating buffer to read
for {
n, err := f.Read(buffer) // reading
fmt.Print(string(buffer[:n])) // writing to console
if err != nil {
fmt.Printf("Err: %v\n", err)
return
}
}
}
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