1366374 - Fail gracefully when a11y COM handler is not registered

Status: RESOLVED FIXED

(Core :: Disability Access APIs, defect)

Description

[Eitan Isaacson [:eeejay]]

We cannot garauntee that the AccessibleHandler.dll will be registered in the OS. For example, when a user uses an zipped distribution of Firefox and not the installer. Our test machines don't use an installer either.

We need to not crash when the dll is not available.

Comment 1

[(No longer employed by Mozilla) Aaron Klotz]

The relevant registry key to look for is:
HKEY_CLASSES_ROOT\CLSID\<CLSID_AccessibleHandler>\InprocHandler32

where

<CLSID_AccessibleHandler> is that CLSID in string form (with curlies and dashes, all uppercase).
CLSID_AccessibleHandler is declared in HandlerData.h (this is a generated header).

Comment 2

[Eitan Isaacson [:eeejay]]

Attachment: Check if AccessibleHandler.dll is registered before using. r?aklotz

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/mozilla-inbound/rev/73d1332a69f4
Check if AccessibleHandler.dll is registered before using. r=aklotz

Comment 4

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

https://hg.mozilla.org/mozilla-central/rev/73d1332a69f4