Codejock Developer Community : Major Bug in CXTPAccessible::AccessibleObjectFromW http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 04 Apr 2026 03:50:47 +0000 Mon, 09 Apr 2007 06:55:00 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=6816 <![CDATA[Codejock Developer Community]]> http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ <![CDATA[Major Bug in CXTPAccessible::AccessibleObjectFromW : Hello ... Problem The following...]]> http://forum.codejock.com/forum_posts.asp?TID=6816&PID=21755&title=major-bug-in-cxtpaccessibleaccessibleobjectfromw#21755 Author: mber
Subject: 6816
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
]]> Mon, 09 Apr 2007 06:55:00 +0000 http://forum.codejock.com/forum_posts.asp?TID=6816&PID=21755&title=major-bug-in-cxtpaccessibleaccessibleobjectfromw#21755