用golang chromedp 操做已经打开的chrome浏览器

win7 环境,主要是一开始想在代码中先用exec.Command启动chrome,但始终不能成功监听9222端口,折腾了很长时间,git

须要先手工启动chrome监听端口(具体写在代码注释中了)而后再运行代码,在开源代码基础上稍做修改,将访问不了的google换成sohu。github

效果就是经过代码将浏览器导航到了sohu.comchrome

// 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,没法成功启动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 //能够在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)\Google\Chrome\Application\chrome.exe" --remote-debugging-port=9222 //或用下一行在cmd中手工启动chrome,和上一行的命令相似,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)\Google\Chrome\Application\chrome.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.ByID), chromedp.WaitVisible(`#res`, chromedp.ByID), 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.ByQuery), chromedp.Location(site), chromedp.Screenshot(`#testimonials`, &buf, chromedp.ByID), chromedp.ActionFunc(func(context.Context, cdp.Executor) error { return ioutil.WriteFile("testimonials.png", buf, 0644) }), } }
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