douquan2023
2014-04-25 03:15
浏览 74
已采纳

Go中是否有等效于ReadLine的文件?

I want to ReadBytes until " " for a text file, not a bufio.

Is there a way to do this without converting to a bufio?

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我要读取字节,直到文本文件(不是bufio)的“ ”为止。

是否可以在不转换为bufio的情况下执行此操作?

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1条回答 默认 最新

  • doumo6356 2014-04-25 03:40
    已采纳

    There are many ways to do it, but wrapping with bufio is what I would suggest. But if that doesn't work for you (why not?), you can go ahead and read single bytes like this:

    Full working example:

    package main
    
    import (
        "bytes"
        "fmt"
        "io"
    )
    
    // ReadLine reads a line delimited by 
     from the io.Reader
    // Unlike bufio, it does so rather inefficiently by reading one byte at a time
    func ReadLine(r io.Reader) (line []byte, err error) {
        b := make([]byte, 1)
        var l int
        for err == nil {
            l, err = r.Read(b)
            if l > 0 {
                if b[0] == '
    ' {
                    return
                }
                line = append(line, b...)
            }
        }
        return
    }
    
    var data = `Hello, world!
    I will write
    three lines.`
    
    func main() {
    
        b := bytes.NewBufferString(data)
    
        for {
            line, err := ReadLine(b)
            fmt.Println("Line: ", string(line))
            if err != nil {
                return
            }
        }
    }
    

    Output:

    Line:  Hello, world!
    Line:  I will write
    Line:  three lines.
    

    Playground: http://play.golang.org/p/dfb0GHPpnm

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