"No such interface supported" error, CVI + Matlab

[amcallis]

I'm trying to run the Labwindows/CVI demo "Matlabdemo.zip" which was created by NI ( http://zone.ni.com/devzone/cda/epd/p/id/2994  ).  The ultimate goal is to call Matlab functions from CVI.  I'm developing with CVI 5.5 and Matlab 7.1.0 R14 SP3.  Since there were compiler errors on the demo source, I found this article about a slight modification to make to the matlabdemo.c source:
http://digital.ni.com/public.nsf/allkb/0FB80F59D0AF9A4F8625703E007BF78B 

Plus I followed those instructions to create a new activex automation controller using the ".fp" file that came with the matlabdemo.zip.  I also installed the CVI 8.0.1 Runtime.

Runtime Error symptoms:
What happens is the "MATLAB DEMO" window pops ups.  This is the CVI window that has the button "Launch Matlab" and a host of other things to demonstrate the CVI/Matlab interface.  I click "Launch Matlab."  Soon after, a matlab window opens in the minized state. Then, apparently before things get connected, I get a CVI "ERROR MESSAGE" which says "No such interface supported" and this popup has an OK button.  I click OK, and the buttons in the MATLAB DEMO are no longer greyed out.  I click the button "Exit Matlab" and get another popup "ERROR," "Error in closing MATLAB".  My only option is to click "QUIT DEMO."

I found this forum post:
http://forums.ni.com/ni/board/message?board.id=231&message.id=3681matching my error.  The forum post links to: http://digital.ni.com/public.nsf/websearch/496671868A2838AF86256BB8005CDC98?OpenDocument 
and also a Microsoft Knowledgebase article.  I completed the replacement of the comcat.dll file to the 4.71 (22 kB version), however the same symptoms remain.

Any suggestions on how to get this CVI<->Matlab interface working?  Thanks for your help.

[amcallis]

Using a newer copy of CVI (v 8.0), I was able to make the demo work.  But using CVI 5.5, the CVI version I wanted to use, the problem persists.  The easy thing to say is: "Upgrade."  Might be the only way, but if there's a way to stick with CVI 5.5 I'd like to!

Instructions say:

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Open the source code for the MATLAB instrument and search and replace ALL instances of &MLApp_IID_DIMLApp with &IID_IDispatch.

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In 5.5, there are no instances of $MLApp_IID_DIMLApp at all in the source files.

I tried taking the source code that worked on the CVI 8.0 and opening it/compiling with the CVI 5.5, but that caused complier errors.

The following errors occur when I compile/run the working project in the older CVI 5.5:

matlabsrvr.c - 10 errors total:

"Missing prototype"  for the method "CA_MethodInvokeEx"  (8 of these)

"Missing prototype"  for the method "CA_InvokeHelperEx" (2 of these)

Anyone have an idea how to fix these using the CVI 5.5?