How to terminate VB process that calls VI Dll Library when application closed

I have simple VB application to call VI DLL library. The problem is the VB executable file will reside in processes list even close the VB application. Looks like VI DLL does not free from memory when VB application unloaded. Did I miss something to terminate or unload VI DLL in VB program or VI program?

Well, I'm afraid we're down to good old-fashioned debugging tricks - something is happening that the OS doesn't want to kill. You can try to comment out sections of the VI (new feature in LV 8.2!) to see when it starts to work, or review the code looking for things like event handlers, callbacks, mutexes, open file handles, etc. It's hard to say what going wrong at this level. Also if you are calling out to 3rd party code (Call Library Node, ActiveX, .NET), make sure that it isn't creating such items and holding onto them.
General rules of thumb...
1. If you don't have a shutdown VI, or some sort of reference close VI, each VI you call from outside (DLL function) must exist with nothing left in LabVIEW - for example, no registered event handlers, no open file handles, etc. Just like camping, "leave it like you found it".
2. If you do have such a shutdown, ensure that everything is indeed being shutdown correctly.
Sorry I can't be more specific.
Brian Tyler
http://detritus.blogs.com/lycangeek

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How to terminate VB process that calls VI Dll Library when application closed

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