本文介绍了如何读取文件的特定行?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要阅读文件的特定行.我已阅读一些相关主题:,
I need to read specific line of file. Some of related topics I've read: golang: How do I determine the number of lines in a file efficiently?, https://stackoverflow.com/questions/30692567/what-is-the-best-way-to-count-lines-in-file
我已经编写了以下函数,它可以按预期工作,但是我怀疑:可能有更好的(有效)方法吗?
I've write the following function and it works as expected, but I have doubt: may be there is better (efficient) way?
func ReadLine(r io.Reader, lineNum int) (line string, lastLine int, err error) {
sc := bufio.NewScanner(r)
for sc.Scan() {
lastLine++
if lastLine == lineNum {
return sc.Text(), lastLine, sc.Err()
}
}
return line, lastLine, io.EOF
}
推荐答案
两个人说我的问题代码是实际解决方案.所以我已经把它贴在这里了.感谢@orcaman的其他建议.
Two people said my code in question is actual solution. So I've posted it here. Thanks to @orcaman for additional advice.
import (
"bufio"
"io"
)
func ReadLine(r io.Reader, lineNum int) (line string, lastLine int, err error) {
sc := bufio.NewScanner(r)
for sc.Scan() {
lastLine++
if lastLine == lineNum {
// you can return sc.Bytes() if you need output in []bytes
return sc.Text(), lastLine, sc.Err()
}
}
return line, lastLine, io.EOF
}
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