bufio.Buffered 返回 0 一个未解决 bug

[zzzkkk]

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

[klesh]

啥版本？似乎 v1.20+ 没这个问题 https://go.dev/play/p/0Iqldy6RqNY?v=goprev

[darrh00]

输出：buffered:12, content:1234

不是 12 吗，哪是 0 ？

[Jooeeee]

试着跑了一下：
buffered:12, content:1234

[ranleng]

❯ go version
go version go1.20.6 darwin/arm64
❯ go run main.go
buffered:12, content:1234

[lxcForPHP]

go 1.18 输出: buffered:12, content:1234

[dif]

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]

所以，建议这种问题先把版本号发出来