# aardio 范例: 调用 Go 语言 - 安装模块



```aardio
//aardio 调用 Go 语言 - 安装模块
import golang;

//参数 @1 指定工作目录，默认为 "/"
var go = golang("/go")

//可选设置代理
//go.setHttpProxy("http://127.0.0.1:1082"); 
//go.setGoProxy("https://mirrors.aliyun.com/goproxy/,direct");

//初始化项目
go.mod("init golang/mdns")

//下载第三方模块
go.get("github.com/miekg/dns")
go.get("github.com/hashicorp/mdns")

//下面是 golang.mdns 的部分源码，完整源码请查看该扩展库
go.main = /**********
package main

import "C"
import (
	"github.com/hashicorp/mdns" 
	"net" 
	"encoding/json"   
) 

type NewServiceParam struct {
	Instance string `json:"instance"`
	Service  string `json:"service"`
	Domain   string `json:"domain"`
	Host     string `json:"host"` 
	Ips []   string `json:"ips"` 
	Txt []   string `json:"Txt"` 
	Port     int    `json:"port"` 
}

var server *mdns.Server;
 
//export StartService
func StartService(serviceParamPtr *C.char)  {

    newServiceParam := NewServiceParam{} 
    json.Unmarshal( []byte(C.GoString( serviceParamPtr )), &newServiceParam)

	var ips []net.IP 
	size := len(newServiceParam.Ips)  
	for i := 0; i < size; i++ {
		ip :=  net.ParseIP(newServiceParam.Ips[i]);
		if(ip != nil){
			ips = append(ips,ip);
		} 
	}

 	var service *mdns.MDNSService
	service, _ = mdns.NewMDNSService(newServiceParam.Instance,newServiceParam.Service,newServiceParam.Domain, newServiceParam.Host,newServiceParam.Port,ips,newServiceParam.Txt)
 
	server, _ = mdns.NewServer(&mdns.Config{Zone: service})  
}

func main(){}
**********/
go.buildShared("/mdns.go");

console.pause(true);
```