The main thread hangs in this call because of a NTWaitFormMultipleObjects deep inside the unload code of the hhctrl.ocx. There are other threads (none of which my code creates) that apparently wait for the same, so my program hangs. I guess some of these threads are created by ADO and/or the Microsoft SQL Server client libraries.
I found one workaround: An additioal call to LoadLibrary('hhctrl.ocx'), so the call to FreeLibrary in Windows.pas does not actually unload the dll but only decrements the reference count to 1. While this seems to work, it does not not feel right.
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So, Embarcadero is responsible for this bug, what can we do? The simplest workaround is (as you've already discovered) to always call HtmlHelp from within your program, or simply LoadLibrary('hhctrl.ocx'), remembering NOT to put this call in initialization part of any unit.
Hhctrl.ocx is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources.The following information can help you determine if hhctrl.ocx is a Windows system file or if it belongs to an application that you can trust.
Description: Hhctrl.ocx is not essential for the Windows OS and causes relatively few problems. Hhctrl.ocx is located in the C:\Windows\System32 folder.Known file sizes on Windows 10/11/7 are 523,776 bytes (69% of all occurrences), 536,576 bytes and 6 more variants.
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior.It can change the behavior of other programs or manipulate other programs. There is no detailed description of this service. The program is not visible. It is not a Windows system file. The hhctrl.ocx file is a Microsoft signed file.Therefore the technical security rating is 68% dangerous.
Important: Some malware camouflages itself as hhctrl.ocx. Therefore, you should check the hhctrl.ocx process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
To help you analyze the hhctrl.ocx process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.
hhctrl.ocx, also known as a Microsoft HTML Help Control file, was created by Microsoft for the development of HTML Help. OCX files fall under under the Win32 DLL (Executable application) file type category.
hhctrl.ocx is considered a type of COM file, or Component Object Model, most commonly known as an ActiveX control. ActiveX controls like hhctrl.ocx are used by Microsoft Office Access 2010 and other software to display media-related content. Therefore, your will most likely encounter a hhctrl.ocx error when attempting to load an audio or video clip, or view some variety of embedded website content. Some of the most common hhctrl.ocx ActiveX errors include:
These OCX errors are most commonly due a missing or corrupt OCX. If your file is missing or corrupt, this could be caused by improper computer shutdown, or a malware infection, both of which could corrupt (or even delete) hhctrl.ocx. If your hhctrl.ocx is corrupted or missing, and therefore cannot be properly loaded by Microsoft Office Access 2010, this will result in an error message.
Finally, another common cause of hhctrl.ocx ActiveX errors can be contributed to an ActiveX-related subkey missing from the Windows registry. Broken DLL (Dynamic Link Library) references in the Windows registry can prevent hhctrl.ocx from registering properly, resulting in an ActiveX error. These broken references (registry keys) are usually triggered by a moved or missing file, or as a result of a leftover DLL file reference after a shared program has been uninstalled.
If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your hhctrl.ocx issue. These troubleshooting steps are listed in the recommended order of execution.
When you install Microsoft Office Access 2010, or another software that uses the hhctrl.ocx dependency, the software should register the file automatically. Sometimes your OCX file won't get registered properly and will trigger a "hhctrl.ocx not registered" error. Thankfully, Microsoft included a handy built-in utility called "Microsoft Register Server" (regsvr32.exe) to enable you to manually re-register your hhctrl.ocx file.
When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many hhctrl.ocx error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:
If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate hhctrl.ocx file version. We maintain a comprehensive database of 100% malware-free hhctrl.ocx files for every applicable version of Microsoft Office Access 2010. Please follow the steps below to download and properly replace you file:
GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve hhctrl.ocx problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.
CAUTION : We strongly advise against downloading and copying hhctrl.ocx to your appropriate Windows system directory. Microsoft typically does not release Microsoft Office Access 2010 OCX files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing hhctrl.ocx and all other OCX files for Microsoft Office Access 2010. An incorrectly installed OCX file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.
Other postings indicate that simply placing a copy of the hhctrl.ocx file right in the C:\Program Files\RockWare\Help\ folder can solve the problem. This file can usually be found in your Windows\system32 folder.
Wise Solutions problems are generally caused by ActiveX control (Component Object Model interface, or "COM" interface) corruption, or if the hhctrl.ocx file has been accidentally or maliciously removed. Downloading and replacing your OCX file can fix the problem in most cases. Furthermore, keeping your registry clean and optimized can prevent invalid file path (like hhctrl.ocx) and file extension references, so we recommend running a registry scan cleanup regularly.
Most of your hhctrl.ocx problems should be resolved if the file is placed in the correct file path directory, but it's a good idea to verify it is fixed. Test the outcome of your replaced file by opening Wise Solutions and seeing if the error message is still being triggered.
From VBA, the viewer is opened via one of two API calls to the control, hhctrl.ocx, which normally is present on all newer Windows installs. This would be very simple, if not for these traps:
Regarding the crash, I'm sorry you encountered it, but I wasn't able to reproduce it, so please provide the steps you did and ideally a simplified version of the project used. Did you right click the grey entry and select Help from the context menu? If so, that is supposed to bring up the help topic for the Variables and Call Stack Window. Does this operation work for other call stack entries or in other dialogs' Help button? I'm asking because in order to show the help CVI uses the HtmlHelp SDK function which uses hhctrl.ocx from the system? Is it possible that got somehow corrupted on your machine and lead to the crash you encountered?
This is simple: when we run '7ZFM.exe' and hit "F1" key, it loads the DLL responsible for the HTML Help system (hhctrl.ocx) and invokes the function "HtmlHelp()" to load the CHM help file and display the GUI to the user, in the same process (that is, '7ZFM.exe') rather than "hh.exe" as some people was claiming. "hh.exe" is just a simple EXE that acts as a container / host and loads CHM files using the HTML Help API. So far, so good. So when 7-ZIP loads the CHM file its common sense that it will be like:
Not sure when you say "ridiculous", if you refer to my finding or to Kagans. Mine is legitimate because Windows fails to expand the "%systemroot%" environment variable and thus fails to find eg. "c:\windows\system32\%systemroot%\system32\hhctrl.ocx", "C:\windows\%systemroot%\system32\hhctrl.ocx", "C:\program files\7-zip\%systemroot%\system32\hhctrl.ocx", etc....this includes all the other paths in the %PATH% environment variable and the current working directory of the target application, in this case 7-zip. My video is clear enough as I show it in real time in Process Monitor program. Notice that I just used 7-ZIP as the example to show people what a real vulnerability is versus a fake one. The problem is NOT with 7-ZIP but with the OS itself when programs use the HTML Help system. Implementation also plays its role in this case, and I noticed the recent versions of 7-ZIP corrected the issue by only searching for "hhctrl.ocx" in the SYSTEM32 directory and thus is not affected by this OS bug anymore. e24fc04721
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