硒-無法連接到遠程服務器

Question

讓我首先為您提供錯誤信息，然后再解釋上下文，最后展示代碼並進行解釋。

錯誤

這是使用FirefoxDriver的相同/相似錯誤

上下文

我制作了一個程序來瀏覽網站並收集一些數據。 該程序在我的本地桌面Windows 7 Professional上可以100％運行，但是當我將其移動到服務器上時，該服務器是帶有.net Framework 3.5的Windows 2003服務器，它將引發上述錯誤。

請注意，在上述情況下，應用程序是多線程的，有兩個線程運行2個selenium實例。 當他們完成要瀏覽的鏈接列表的收集時，應用程序就會出現問題。 一個線程將一個接一個地查找並瀏覽鏈接列表，當另一個線程完成收集鏈接時，它希望探索兩個硒客戶端中斷並開始拋出上述錯誤。

我沒有使用非.NET Framework 3.5的任何功能。...一切都經過標准化以適合2003服務器（至少據我所知）。

碼

收集鏈接時：

  List<string> totalList = new List<string>();
                if (loadedSave == null)
                {
                    webManager.driver.Navigate().GoToUrl(getOffenderListURL(countyId));
                    for (int l = 2; l < 10000; l++)
                    {
                        try
                        {
                            var element1 = new WebDriverWait(webManager.driver, TimeSpan.FromSeconds(5)).Until(ExpectedConditions.ElementExists((By.XPath(getOffenderxPath(l)))));

                            string linkToOffender = element1.GetAttribute("href");
                            string offenderId = linkToOffender.Substring(linkToOffender.IndexOf('=') + 1);
                            if (totalList.Contains(offenderId))
                            {
                                continue;
                            }
                            totalList.Add(offenderId);
//----- ^^^^^ Add the links/ids to a list for later-----
                        }
                        catch (Exception e)
                        {
// ignore this error catch.... its not relevant 
                            if (totalList.Count < 5 && countyId != 21)
                            {
                                if (Program.SiteDownCounter < 4)
                                {
                                    if (Program.LastDown != DateTime.MinValue)
                                    {
                                        if ((DateTime.Now - Program.LastDown).TotalMinutes > 30)
                                        {
                                            Program.sendMail("NY State website seems to be down... will suspend action for 30 minutes. Current time: " + DateTime.Now, "NY State Site Down!");
                                            Program.LastDown = DateTime.Now;
                                            Program.SiteDownCounter++;
                                            for (int x = 0; x < 30; x++)
                                                Thread.Sleep(1000);
                                        }
                                        else
                                        {
                                            Thread.Sleep((1800 - (int)((DateTime.Now - Program.LastDown).TotalSeconds)) * 1000);
                                        }
                                    }
                                    else
                                    {
                                        Program.sendMail("NY State website seems to be down... will suspend action for 30 minutes. Current time: " + DateTime.Now, "NY State Site Down!");
                                        Program.LastDown = DateTime.Now;
                                        Program.SiteDownCounter++;
                                        for (int x = 0; x < 30; x++)
                                            Thread.Sleep(1000);
                                    }
                                }
                                else
                                {
                                    start = false;
                                    break;
                                }
                                continue;
                            }
                            break;
                        }
                    }
                }
                else
                {
                    if (loadedSave.CompletedList != null)
                        totalList = loadedSave.CompletedList;
                    else
                    {
                        Console.WriteLine("The hell?");
                    }

                }
                Program.LastDown = DateTime.MinValue;
                Program.SiteDownCounter = 0;
                ScrapeLogic(countyId, out2, loadedSave, totalList);
            }

完成收集鏈接后：

 private void ScrapeLogic(int countyId, string value, ScraperStateSave LoadedSaveState, List<string> total)
        {
            ScraperStateSave saveState = new ScraperStateSave();
            saveState.CountyId = countyId;
            int totalCompletedCount = (LoadedSaveState != null ? LoadedSaveState.CompletedCount : 0);
            int instanceCompletedCount = 0;
            for (int l = totalCompletedCount; l < total.Count; l++)
            {
                try
                {
                    if (Program.SiteDownCounter >= 3)
                        throw new Exception("Shutdown");
                    webManager.driver.Navigate().GoToUrl(getOffenderLinkById(total[l]));
                    string offenderId = total[l];
                    var currentPlacement = webManager.getElementTextByxPath(currentPlacementxPath, true);
                    Boolean wanted = false;
                    try
                    {
                       IWebElement wantedLabel = webManager.driver.FindElement(By.XPath("//*[@id=\"mainContent\"]/h3[2]"));
                       wanted = true;
                    }
                    catch (NoSuchElementException)
                    {

                    }
                    var lastName = webManager.getElementTextByxPath(getOffenderInfoBasic(1, 2));
                    var firstName = webManager.getElementTextByxPath(getOffenderInfoBasic(1, 3));
                    var middleName = webManager.getElementTextByxPath(getOffenderInfoBasic(1, 4));
                    var dob = webManager.getElementTextByxPath(getOffenderInfoBasic(1, 5));
                    var sex = webManager.getElementTextByxPath(getOffenderInfoBasic(1, 6));
                    var riskLevel = webManager.getElementTextByxPath(getOffenderInfoBasic(1, 7));
                    var designation = webManager.getElementTextByxPath(getOffenderInfoBasic(1, 8));
....and more of the same

線程如何啟動：

 public NYScaper(Boolean local, Boolean quiet, int id)
    {
        this.localScrape = local;
        this.threadId = id;
        this.quiet = quiet;
        Thread t = new Thread(doScrape);
        t.Start();
    }

一些可能有問題的代碼：

  public IWebElement getElementByxPath(string xpath) 
        {
            return driver.FindElement(By.XPath(xpath));
        }


        public string getElementTextByxPath(string xpath)
        {
            return driver.FindElement(By.XPath(xpath)).Text;
        }

        public string getElementTextByxPath(string xpath, Boolean wait)
        {
            return new WebDriverWait(driver, TimeSpan.FromSeconds(2)).Until(ExpectedConditions.ElementExists((By.XPath(xpath)))).Text;
        }

主要問題/概述：

在Windows 7 Professional上有效，但在2003 Server上無效！ 錯誤似乎只出現在鏈接收集和數據收集之間或數據收集開始時。 有兩個線程，它們可以在本地Windows 7桌面上正常工作。 如果程序重新啟動，它將加載鏈接的保存，並且將與那些保存的鏈接一起工作，而不會顯示錯誤！

Answer 1

當瀏覽器未顯示為頂部屏幕時，會發生此錯誤。 因此，如果將其最小化，則最終會發生這種情況。

到目前為止，尚無解決方案，有關此問題的更新，請參閱https://code.google.com/p/selenium/ 。