用golang chromedp 操作已经打开的chrome浏览器

// Command standalone is a chromedp example demonstrating how to use chromedp
// with a standalone (ie,a "pre-existing" / manually started) chrome instance.
package main

import (
    "context"
    "fmt"
    "io/ioutil"
    "log"

    "time"

    "github.com/chromedp/cdproto/cdp"
    "github.com/chromedp/chromedp"
    "github.com/chromedp/chromedp/client"
)

func main() {
    //用cmd中用带 /c start命令，无法成功启动chrome监听端口，
    //用exec.Command("C:/Program Files (x86)/Google/Chrome/Application/chrome.exe","--remote-debugging-port=9222").Run()也不行
    //可以在windows cmd 中手工执行下一行的命令启动chrome,注意修改chrome实际路径，另外注意将chrome.exe加入windows防火墙
    //cmd /c "C:Program Files (x86)GoogleChromeApplicationchrome.exe"  --remote-debugging-port=9222
    //或用下一行在cmd中手工启动chrome,和上一行的命令类似,注意修改chrome实际路径，注意命令的前半部分有双引号，后半部分没有双引号
    //"C:Program Files (x86)GoogleChromeApplicationchrome.exe"  --remote-debugging-port=9222
    time.Sleep(3 * time.Second)
    var err error

    // create context
    ctxt,cancel := context.WithCancel(context.Background())
    defer cancel()

    // create chrome
    c,err := chromedp.New(ctxt,chromedp.WithTargets(client.New().WatchPageTargets(ctxt)),chromedp.WithLog(log.Printf))
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("ctxt")
    // run task list
    var site,res string
    err = c.Run(ctxt,googleSearch("site:sohu.com","Easy Money Management",&site,&res))
    if err != nil {
        log.Fatal(err)
    }

    log.Printf("saved screenshot of #testimonials from search result listing `%s` (%s)",res,site)
}

func googleSearch(q,text string,site,res *string) chromedp.Tasks {
    var buf []byte
    sel := fmt.Sprintf(`//a[text()[contains(.,‘%s‘)]]`,text)
    return chromedp.Tasks{
        chromedp.Navigate(`https://www.sohu.com`),
        chromedp.Sleep(2 * time.Second),chromedp.WaitVisible(`#hplogo`,chromedp.ByID),chromedp.SendKeys(`#lst-ib`,q+"n",chromedp.WaitVisible(`#res`,chromedp.Text(sel,res),chromedp.Click(sel),chromedp.Sleep(2 * time.Second),chromedp.WaitVisible(`#footer`,chromedp.ByQuery),chromedp.WaitNotVisible(`div.v-middle > div.la-ball-clip-rotate`,chromedp.Location(site),chromedp.Screenshot(`#testimonials`,&buf,chromedp.ActionFunc(func(context.Context,cdp.Executor) error {
            return ioutil.WriteFile("testimonials.png",buf,0644)
        }),}
}