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zzzkkk
V2EX  ›  Go 编程语言

bufio.Buffered 返回 0 一个未解决 bug

  •  
  •   zzzkkk · 2023-09-10 10:10:19 +08:00 · 1085 次点击
    这是一个创建于 427 天前的主题,其中的信息可能已经有所发展或是发生改变。

    最近再练手精进 网上弄了段代码 运行发型 bufio.Buffered()永远返回 0

    package main
    
    import (
            "bufio"
            "fmt"
            "strings"
    )
    
    func main() {
            //原始字符串
            str := "12345678901234567890123456789012345678901234567890"
    
            //将字符串转换为流式 I/O 对象
            strReader := strings.NewReader(str)
    
            //设置读缓存区大小
            bufReader := bufio.NewReaderSize(strReader, 16) //16byte
    
            //缓存读
            p := make([]byte, 4)
            n, err := bufReader.Read(p)
            if err != nil {
                    panic(err)
            }
    
            buffered := bufReader.Buffered()
            fmt.Printf("buffered:%d, content:%s\n", buffered, p[:n])
    }
    

    网上搜来搜去只返回一个结果

    13 年前有人 report 过 4 年前也有人遇到过 到现在是不是还没解决?

    https://groups.google.com/g/golang-nuts/c/1smBsPOdFT0

    I'm having a similar problem as the original poster. I expect Buffered() to return the number of bytes that can be read from the current buffer, like the documentation states. However a call to Buffered() returns 0 both before and after a call to any Read() that finds bytes in the buffer. In my case the Reader is a net.Conn.

    How do we use Buffered() properly? This is the only google result I could find that even mentions using the function.

    I ended up solving my problem without using bufio. -Sam

    7 条回复    2023-09-11 11:25:08 +08:00
    klesh
        1
    klesh  
       2023-09-10 10:27:09 +08:00
    啥版本?似乎 v1.20+ 没这个问题 https://go.dev/play/p/0Iqldy6RqNY?v=goprev
    darrh00
        2
    darrh00  
       2023-09-10 10:32:24 +08:00
    输出:buffered:12, content:1234

    不是 12 吗,哪是 0 ?
    Jooeeee
        3
    Jooeeee  
       2023-09-10 10:32:44 +08:00
    试着跑了一下:
    buffered:12, content:1234
    ranleng
        4
    ranleng  
       2023-09-10 12:00:19 +08:00
    ❯ go version
    go version go1.20.6 darwin/arm64
    ❯ go run main.go
    buffered:12, content:1234
    lxcForPHP
        5
    lxcForPHP  
       2023-09-10 16:10:48 +08:00
    go 1.18 输出: buffered:12, content:1234
    dif
        6
    dif  
       2023-09-11 11:24:36 +08:00
    和楼上一样:
    go version
    warning: GOPATH set to GOROOT (D:\devtools\go) has no effect
    go version go1.19.5 windows/amd64

    buffered:12 ,context:1234
    dif
        7
    dif  
       2023-09-11 11:25:08 +08:00
    所以,建议这种问题先把版本号发出来
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