如何使用govmomi client API获取vCenter版本？

import (
    "context"
    "fmt"
    "net/url"

    "github.com/vmware/govmomi/vim25/soap"
    "github.com/vmware/govmomi/vim25/types"
    "github.com/vmware/govmomi/vim25/xml"
)

func createClient() (*govmomi.Client, error) {
    // vCenter服务器的URL
    u, err := url.Parse("https://vcenter-server/sdk")
    if err != nil {
        return nil, err
    }

    // 忽略证书验证
    u.User = url.UserPassword("username", "password")
    insecure := true

    // 创建SOAP客户端
    soapClient := soap.NewClient(u, insecure)

    // 创建govmomi客户端
    client, err := govmomi.NewClient(context.Background(), u, insecure)
    if err != nil {
        return nil, err
    }

    // 设置SOAP客户端
    client.Client = soapClient

    return client, nil
}

func getVCenterVersion() (string, error) {
    // 创建govmomi客户端
    client, err := createClient()
    if err != nil {
        return "", err
    }

    // 获取ServiceContent
    c := client.Client
    sc := c.ServiceContent

    // 获取vCenter版本
    aboutInfo := sc.About
    version := aboutInfo.Version

    return version, nil
}

func main() {
    version, err := getVCenterVersion()
    if err != nil {
        fmt.Println("获取vCenter版本失败：", err)
        return
    }

    fmt.Println("vCenter版本：", version)
}