Access violation stops JabWrapper

Open

#2 opened on Jul 5, 2021 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: java, python
Domain: accessibility, operating-systems

Research direction

Reproduce the test setup that creates JavaAccessBridgeWrapper, then inspect jab_wrapper.py around WindowsAccessBridge loading and jab_utils.py:53-55 around pump_background, GetMessage, and DispatchMessage. Compare the stated Windows configuration with the failure and document or verify a fix that prevents the access violation during initialization.

Written by the indexing model from the issue text.

Description

When running setup for tests to init the JabWrapper, I am getting:

DEBUG    root:jab_wrapper.py:112 Loading WindowsAccessBridge
DEBUG    root:jab_wrapper.py:118 WindowsAccessBridge loaded succesfully
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
Windows fatal exception: access violation

Current thread 0x0000030c (most recent call first):
  File "C:\Users\Me\PycharmProjects\test_proj\utils\jab_utils.py", line 53 in pump_background

The offending line is "while GetMessage(message, 0, 0, 0) > 0" at:

    try:
        jab_wrapper = JavaAccessBridgeWrapper()
        pipe.put(jab_wrapper)
        message = byref(wintypes.MSG())
        while GetMessage(message, 0, 0, 0) > 0: 
            TranslateMessage(message)
            logging.debug("Dispatching msg={}".format(repr(message)))
            DispatchMessage(message)

I have enabled Access Bridge for Windows, referenced the dll as an env var, removed user prefs for accessibility at .accessibility.properties and made sure that jabswitch is enabled.

Any ideas?

Dominant language: Python
Stars: 20
Forks: 8
PR merge metrics: No merged PRs in 30d

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