在 Microsoft Word 实例的 python 中使用 AccessibleObjectFromWindow

Question

我正在尝试使用 python 操作特定的已打开、未保存（因此没有路径）的 Word 文档 (*.doc)。如果只打开一个 Word 实例，操作效果很好，但是多个实例会产生一些困难，请参考 SO 问题 Word VBA and Multiple Word Instances.

我找到了一些关于在 C# 中处理此问题的参考资料 (How to access Microsoft Word existing instance using late binding) and VB.NET (Multiple Instances of Applications)，并设法将它们翻译成 python 到一定程度。这是我现在所在的位置：

import win32com.client as win32
import win32gui
#GUID class from http://svn.python.org/projects/ctypes/tags/release_0_2/ctypes/comtypes/GUID.py
from GUID import GUID
from ctypes import oledll
from ctypes import byref
from comtypes import POINTER
from comtypes.automation import IDispatch

#Use win32 functions to get the handle of the accessible window
#of the desired Word instance.  Specific code not relevant here, 
#but I'll end up with an integer such as:
hwnd = 2492046

OBJID_NATIVEOM = 0xffffff0
IID_IDispatch = byref(GUID("{00020400-0000-0000-C000-000000000046}"))
p = POINTER(IDispatch)()
oledll.oleacc.AccessibleObjectFromWindow(hwnd, OBJID_NATIVEOM, IID_IDispatch, p)

当运行时，这个returns错误信息：

  File "wordtest.py", line 55, in <module>
    oledll.oleacc.AccessibleObjectFromWindow(hwnd, OBJID_NATIVEOM, IID_IDispatch, p)
  File "_ctypes/callproc.c", line 945, in GetResult
WindowsError: [Error -2147024809] The parameter is incorrect

如能协助解决此错误，我们将不胜感激！

Answer 1

一些搜索 NVDA（非可视化桌面访问）的 GitHub 代码显示我为 OBJID_NATIVEOM 使用的值不正确，我需要将指针包装在 byref( ), 还有一种更简单的方法来获取 IDispatch 的 GUID:

#Part of the pywin32 package that must be installed with the pywin32
#installer:
import win32gui

from ctypes import oledll
from ctypes import byref

#installed by easy_install comtypes
from comtypes import POINTER
from comtypes.automation import IDispatch
import comtypes.client.dynamic as comDy

#Handle integer hwnds[0] from code at 
#

OBJID_NATIVEOM = -16
p = POINTER(IDispatch)()
oledll.oleacc.AccessibleObjectFromWindow(hwnds[0], OBJID_NATIVEOM,
    byref(IDispatch._iid_), byref(p))

window = comDy.Dispatch(p)
word = window.application
cert = word.Documents(1)

在 Microsoft Word 实例的 python 中使用 AccessibleObjectFromWindow

Using AccessibleObjectFromWindow in python on Microsoft Word instance

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