golang怎么编写一个window定时关机

package mainimport (
    "flag"
    "fmt"
    "github.com/robfig/cron"
    "time")import (
    . "github.com/CodyGuo/win")var (
    arg string)func init() {
    flag.StringVar(&arg, "uFlags", "shutdown", "shutdown logoff reboot")}func main() {
    flag.Parse()

    c := cron.New(cron.WithSeconds())
    c.AddFunc("0 40 18 * * ?", shutdown)
    c.Start()
    select {}

    switch arg {
    case "logoff":
        logoff()
    case "reboot":
        reboot()
    case "shutdown":
        shutdown()
    default:
        fmt.Println("您输入的参数有误.")
    }}func Test(){
    fmt.Println(time.Now())}func logoff() {
    ExitWindowsEx(EWX_LOGOFF, 0)}func reboot() {
    getPrivileges()
    ExitWindowsEx(EWX_REBOOT, 0)}func shutdown() {
    getPrivileges()
    ExitWindowsEx(EWX_SHUTDOWN, 0)}func getPrivileges() {
    var hToken HANDLE    var tkp TOKEN_PRIVILEGES    OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES|TOKEN_QUERY, &hToken)
    LookupPrivilegeValueA(nil, StringToBytePtr(SE_SHUTDOWN_NAME), &tkp.Privileges[0].Luid)
    tkp.PrivilegeCount = 1
    tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED    AdjustTokenPrivileges(hToken, false, &tkp, 0, nil, nil)}

c.AddFunc("0 40 18 * * ?", shutdown)