webdriver 問題小記

原文寫於 Cmd Markdown
原文連接：https://www.zybuluo.com/CYTand/note/1208879

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在嘗試《Jenkins 建立構建任務》這個項目時遇到一些問題，本文用於記錄解決方法（能夠說是很小白的方法了）。

問題主要在這一步：C:\Users\wis01>python d:/py_tests.py

輸出爲：

[5956:4996:0710/155156.898:ERROR:install_util.cc(589)] Unable to create registry key HKLM\SOFTWARE\Policies\Google\Chro
    e for reading result=2

    DevTools listening on ws://127.0.0.1:12075/devtools/browser/9ea3a1c2-613a-4752-a3f8-05f619563ff7
    E[10772:6808:0710/155209.983:ERROR:install_util.cc(589)] Unable to create registry key HKLM\SOFTWARE\Policies\Google\Ch
    ome for reading result=2

    DevTools listening on ws://127.0.0.1:12532/devtools/browser/2315ce85-01b3-441c-8a56-d553470e711b
    E
    ======================================================================
    ERROR: test_case (__main__.TestClass)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "d:/py_tests.py", line 16, in test_case
        self.driver.get(self.base_url)
      File "D:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 332, in get
        self.execute(Command.GET, {'url': url})
      File "D:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 320, in execute
        self.error_handler.check_response(response)
      File "D:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
        raise exception_class(message, screen, stacktrace)
    WebDriverException: Message: unknown error: cannot determine loading status
    from unknown error: missing or invalid 'entry.level'
      (Session info: chrome=67.0.3396.99)
      (Driver info: chromedriver=2.29.461591 (62ebf098771772160f391d75e589dc567915b233),platform=Windows NT 6.1.7601 SP1 x8
    _64)


    ======================================================================
    ERROR: test_case2 (__main__.TestClass)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "d:/py_tests.py", line 22, in test_case2
        self.driver.get(self.base_url)
      File "D:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 332, in get
        self.execute(Command.GET, {'url': url})
      File "D:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 320, in execute
        self.error_handler.check_response(response)
      File "D:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
        raise exception_class(message, screen, stacktrace)
    WebDriverException: Message: unknown error: cannot determine loading status
    from unknown error: missing or invalid 'entry.level'
      (Session info: chrome=67.0.3396.99)
      (Driver info: chromedriver=2.29.461591 (62ebf098771772160f391d75e589dc567915b233),platform=Windows NT 6.1.7601 SP1 x8
    _64)


    ----------------------------------------------------------------------
    Ran 2 tests in 25.587s

    FAILED (errors=2)

這裏有兩種錯誤：

一、註冊表致使

[5956:4996:0710/155156.898:ERROR:install_util.cc(589)] Unable to create registry key HKLM\SOFTWARE\Policies\Google\Chrome for reading result=2

找不到註冊信息。

解決方法：

1）打開註冊表編輯器

a) 快捷鍵win+R
b) 輸入：regedit
c) 打開regedit.exe

2）找到並按順序展開如下項目：

-HKEY_LOCAL_MACHINE
    -SOFTWARE
        -Policies

3）在Policies下建立Chrome項：

a) 選中Policies
b) 點擊右鍵
c) 新建 - 項(k)
d) 將該項命名爲：Google

4）在Google下建立Chrome項：

a) 選中Google
b) 點擊右鍵
c) 新建 - 項(k)
d) 將該項命名爲：Chrome

5）在Chrome下新建MachineLevelUserCloudPolicyEnrollmentToken字串：

a) 選中Chrome
b) 點擊右鍵
c) 新建 - 字符串值(s)
d) 將該字符串命名爲：MachineLevelUserCloudPolicyEnrollmentToken

6）若本來已有Google、Chrome項，則直接在下面添加第五步中的字符串值便可。

二、webdriver致使

WebDriverException: Message: unknown error: cannot determine loading status
    from unknown error: missing or invalid 'entry.level'
      (Session info: chrome=67.0.3396.99)
      (Driver info: chromedriver=2.29.461591 (62ebf098771772160f391d75e589dc567915b233),platform=Windows NT 6.1.7601 SP1 x8
    _64)

webdriver與Chrome二者版本不匹配（通常來講，二者均保持最新便可）。

解決方法：

1）更新Chrome

2）更新webdriver

參考如下連接提供的webdriver下載地址：
http://www.testclass.net/selenium_python/selenium3-browser-driver/

3）必定要替換原來的webdriver，若忘記了原來的位置，能夠到環境變量配置中看一下

以上。