GO SectionReader.Seek用法及代碼示例

package main

import (
    "io"
    "log"
    "os"
    "strings"
)

func main() {
    r := strings.NewReader("some io.Reader stream to be read\n")
    s := io.NewSectionReader(r, 5, 17)

    if _, err := s.Seek(10, io.SeekStart); err != nil {
        log.Fatal(err)
    }

    if _, err := io.Copy(os.Stdout, s); err != nil {
        log.Fatal(err)
    }

}

stream