我应该如何处理调试NULL COM指针访问错误？

问题描述：

嗨Stack Overflow社区，我应该如何处理调试NULL COM指针访问错误？

我需要为客户端自动化专有应用程序。我已经能够成功运行一些示例代码here（即pywinauto在记事本上工作）。对于专有应用程序，似乎任何最终的elements_from_uia_array(ptrs_array, cache_enable)调用失败，特别是针对此应用程序的相同NULL COM指针访问错误。我应该如何解决这个问题？

语境：

环境：Windows 10的Python 3.6.2，pywinauto-0.6.3
观察：自动化谷歌浏览器时，没有空COM错误&记事本

这里我试图从WindowsSpecification创建包装器对象时得到的堆栈跟踪。任何顶级窗口上的print_control_identifiers()也给我同样的错误。

>>> test = actual_window.child_window(auto_id="_buttonFindStudent",control_type="Button") 
>>> test 
<pywinauto.application.WindowSpecification object at 0x000002277006DC50> 
>>> profit = test.wrapper_object() 
Traceback (most recent call last): 
    File "<pyshell#30>", line 1, in <module> 
profit = test.wrapper_object() 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\application.py", line 254, in wrapper_object 
ctrls = self.__resolve_control(self.criteria) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\application.py", line 245, in __resolve_control 
criteria) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\timings.py", line 425, in wait_until_passes 
func_val = func(*args) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\application.py", line 209, in __get_ctrl 
ctrl = self.backend.generic_wrapper_class(findwindows.find_element(**ctrl_criteria)) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\findwindows.py", line 84, in find_element 
elements = find_elements(**kwargs) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\findwindows.py", line 214, in find_elements 
depth=depth) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\uia_element_info.py", line 283, in descendants 
elements = self._get_elements(IUIA().tree_scope["descendants"], cond, cache_enable) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\uia_element_info.py", line 262, in _get_elements 
return elements_from_uia_array(ptrs_array, cache_enable) 
    File "C:\Users\SK2\AppData\Local\Programs\Python\Python36\lib\site-packages\pywinauto\uia_element_info.py", line 48, in elements_from_uia_array 
for n in range(ptrs.Length): 
ValueError: NULL COM pointer access

类似于这样的问题：https://github.com/pywinauto/pywinauto/issues/296要尽快修复它（本月）。 –

你可以尝试从[这个分支]修复（https://github.com/airelil/pywinauto/archive/dev.zip）？ –

将尝试修复并让你知道！ – AMemberofDollars

答

pywinauto==0.6.4修正了这个问题（刚刚发布在PyPI上）。对不起，等了很久。只需升级它pip install -U pywinauto。

我应该如何处理调试NULL COM指针访问错误？

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