Question

我正在尝试使用flag包。我的整个问题是我需要为同一参数指定组/多个值。例如，我需要解析一个命令，如下所示：

 go run mycli.go -action first -point 10 -action
 second -point 2 -action 3rd -point something

我需要检索每组动作/点参数。可能吗？

Answer 1

package main

import (
    "flag"
    "fmt"
    "strconv"
)

// Define a type named "intslice" as a slice of ints
type intslice []int

// Now, for our new type, implement the two methods of
// the flag.Value interface...
// The first method is String() string
func (i *intslice) String() string {
    return fmt.Sprintf("%d", *i)
}

// The second method is Set(value string) error
func (i *intslice) Set(value string) error {
    fmt.Printf("%s\n", value)
    tmp, err := strconv.Atoi(value)
    if err != nil {
        *i = append(*i, -1)
    } else {
        *i = append(*i, tmp)
    }
    return nil
}

var myints intslice

func main() {
    flag.Var(&myints, "i", "List of integers")
    flag.Parse()
}

参考：http://lawlessguy.wordpress.com/2013/07/23/filling-a-slice-using-command-line-flags-in-go-golang/

Answer 2

旗帜套餐不会帮助你。最接近你的是os包：

[jadekler@Jeans-MacBook-Pro:~/go/src]$ go run temp.go asdasd lkjasd -boom bam -hello world -boom kablam

[/var/folders/15/r6j3mdp97p5247bkkj94p4v00000gn/T/go-build548488797/command-line-arguments/_obj/exe/temp asdasd lkjasd -boom bam -hello world -boom kablam]

因此，第一个运行时标志键是os.Args [1]，值是os.Args [2]，下一个键是os.Args [3]，依此类推。

如何在go中定义一组标志？

2 个答案: