ActiveX CAB does not work on a machine where the ocx was not previously intsalled

Posted on 2003-02-21
Medium Priority
Last Modified: 2007-12-19
Here is some background. I created a fairly indepth OCX, which takes advantage of mulitple controls and classes.

In my development environment the control works well, on a web page and in a vb form.

However, when the created cab is put onto a webserver, the control fails to activate when the page is accessed.

Using visual studio installer, if I create an MSI and install the ocx and it's components onto another machine and then access this same page. The control works fine.

This leads me to believe that the cab was perhaps missing some required files, but it in fact has everything +more then the installer had.

Does anyone know how I can determine whats missing in my cab, or why my ocx will not run on a foreign computer when accessed via a webpage?
Question by:FatJoey
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Expert Comment

ID: 7995319
Can say for sure but previously when I have run into similar problems it was related to permissions.  No doubt you have an admin account on the machine you develop on or at least you are the owner of all the files you need to use.

Have you check that the user account under which your web server is running has the required permissions to access all the components required?  As a test you can try set the web server to run scripts using an account that has access to everything (don't leave it that way though!).  This should determine if this is a permissions problem.


Expert Comment

ID: 7995544
I have recently been working on web pages with .cab files. Although i didn't write the ActiveX control myself there were plenty of problems to overcome.

As suggested by PaschalNee, i ran into permissions issues, and needed local admin rights to install on demand the .cab file.

Is your .cab signed? If not you need to check your browser accepts unsigned ActiveX controls.

Also do you have licensing on the ActiveX control. If so you need to create an .lpk file. You would also need the following code in the top of your .htm/.asp page.

<OBJECT id="Microsoft_Licensed_Class_Manager_1_0" classid="clsid:5220CB21-C88D-11cf-B347-00AA00A28331" VIEWASTEXT>
     <PARAM name="LPKPath" value="YOUR.lpk">

You can find more info on lpk tool on the Microsoft MSDN site.

Also check you have the correct codebase and options...

<OBJECT id="GridEXSpendTable" codebase="YOUR.CAB#version=2,0,0,2308"......</OBJECT>

There are many options for the "codebase" property.

What options do you have in your .inf file mine ended up as this...










I think most of my problems were caused by the .inf file not copying and registering on the client machine.

Hope some of this may help


Author Comment

ID: 8012174
I will take a look at IIS permission but I don't think this is the issue.

I'm pretty sure it has something a component not downloading and installing via IIS. What lead s me to this conclusion is the following:

1) If I use an MSI created with Visual Studio Installer, install it on the a computer and then access the same web page, the borwser shows the correct components.

2) As a test, I took the htm file generated by the packaging and deployment wizard and viewed each custom component in my OCX. The OCX contains 5 controls, which are then aggreegated into another control. 4 of the 5 controls are visible in IE using the cab file on fresh machine. This leads me to belive the the "final" control is not visible because of the problematic 5th control.

I'm not neccessarily looking for a solution. The info I seek is how do I go about debugging this situation? How can I tell what components are failing to DL and install in this 5th control. And possibly, why?

Thanks for your help guys.
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Expert Comment

ID: 8015280
I don't really know about debugging the rest of this but debugging the possible permissions problems can be done enabling the auditing on your file system and check what messages get logged to the event manager.  It should log failed read/execute attempts on the components.  I'm assuming you are using NTFS and not FAT as a file system.

Author Comment

ID: 8017787
Sorry paschalNee, I'm a little lost can you explain that?

I need to enable auditing on web server file system or the client file system? Either way how do I go about doing that?

Expert Comment

ID: 8024014
On the server locate the DLL's you are using, right click on each one and go to the security tab.  If you do not have a security tab then the file system id not NTFS and this is not going to work.  Click the auditing button.  Enable auditing of success or failure for the user your web server executes as (or everybody if you are not sure).

After restarting your app you will be able to see the detail of what is happening in the security section of the event viewer (under administrative tools from the Start menu).

Author Comment

ID: 8028138
This wasn't the issue. I solved it just now.

I put logging statements in the problematic ocx and found that it couldn't init one of its comp ocx's because there was a conflicting ocx (older version with no binary compat set) on the system.

Thanks though.


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Expert Comment

ID: 9350155
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