Toolkit Pro - Major Bug in CXTPAccessible::AccessibleObjectFromW

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Major Bug in CXTPAccessible::AccessibleObjectFromW

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Category: Codejock Products
Forum Name: Toolkit Pro
Forum Description: Topics Related to Codejock Toolkit Pro
URL: http://forum.codejock.com/forum_posts.asp?TID=6816
Printed Date: 29 April 2024 at 2:53am
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Topic: Major Bug in CXTPAccessible::AccessibleObjectFromW

Posted By: mber
Subject: Major Bug in CXTPAccessible::AccessibleObjectFromW
Date Posted: 09 April 2007 at 6:55am

Hello ...

Problem

The following bug causes an access violation (crash on Windows Vista) on all systems where an accessibility client (e.g. Narrator from MS Windows, HP Credential Manager for ProtectTools and many others) is active.

Reproduce

To reproduce the problem

1. Start Narrator (Accessories->Accessibility->Narrator).

2. Start a sample application from Codejock (e.g. Gallery Sample).

3. Select a menu item (e.g. File).

4. Move mouse to another menu item (e.g. Edit)

=> Crash in oleacct.dll on Windows Vista, Access Violation (Cannot read memory at address ...) on all others.

Fix

Version: 10.4.2

File: XTPSystemHelper.cpp

HRESULT CXTPAccessible::AccessibleObjectFromWindow(HWND hwnd, DWORD dwId, REFIID riid, void** ppvObject)
{
if (!m_modOleAcc)
{
m_modOleAcc.LoadLibrary(_T("oleacc.dll"));
}

if (m_pAccessibleObjectFromWindow == 0)
{
BUG:

m_modOleAcc.GetProcAddress(
(FARPROC*)&m_pNotifyWinEvent, "AccessibleObjectFromWindow");

FIX:

m_modOleAcc.GetProcAddress(
(FARPROC*)&m_pAccessibleObjectFromWindow, "AccessibleObjectFromWindow");
}

if (m_pAccessibleObjectFromWindow)
{
return m_pAccessibleObjectFromWindow(hwnd, dwId, riid, ppvObject);
}
return E_FAIL;
}

Regards,

-Mat

SmartFTP

http://www.smartftp.com - http://www.smartftp.com