io、os（從終端、文件、字符串讀取的小例子）

package main

import (
    "io"
    "strings"
    "fmt"
    "os"
)

func ReadFrom(reader io.Reader, num int) ([]byte, error) {
    p := make([]byte, num)
    n,err := reader.Read(p)
    if n > 0 {
        return p[:n], nil
    }
    return p, err
}

//從字符串讀
func sampleReadFromString() {
    data, _ := ReadFrom(strings.NewReader("from string"), 12)
    fmt.Println(string(data))
}

//從終端讀
func sampleReadFromStdin() {
    fmt.Println("please input from std:")
    data, _ := ReadFrom(os.Stdin, 11)
    fmt.Println(string(data))
}

//從文件讀
func sampleReadFromFile() {
    file, _ := os.Open("io操作.go")
    defer file.Close()
    data, _ := ReadFrom(file, 9)
    fmt.Println(string(data))
}

func main() {
    sampleReadFromString()
    sampleReadFromStdin()
    sampleReadFromFile()
}

輸出：