How can I design my LabVIEW app to behave differently based on installed components?

Howdy all,
I've got a program that is complete, and offers some basic service. Advanced users will have the option of additional functionality. When users decide to use this program, they decide what capabilities they want - whether it provides just the base functionality, or if it has the advanced functionalities. The additional functionality relies on the installation of an additional LabVIEW component. In this case, the base package requires simply the LabVIEW(7) runtime engine. However the additional functionalities are vision related and require the installation of the IMAQ Vision 7 Development Module. I would like my program to detect the installation of the vision module
on the user's computer, and give the user access to these vision functions ONLY if the vision pack is installed. (ie, I don't want to have two versions of the program - the user only installs one complete version, but some components will be hidden if they don't have the vision module)
Currently, this program checks the Window's system32 directory for the presence of the imaq.dll and the nivision.dll. Right now, this system *sort of* works on most computers, but if the user has their windows installed in a non-standard windows directory (say they installed windows to "windoze" or something other than the standards like "Windows" and "Winnt")
Does anyone know of a way to programmatically detect the installation of the Vision module? What I'm doing right now would work in 95% of the cases (I think) if I could nail down the root windows directory (which I'm pretty sure is stored in the registry for all Windows versions, but the name of the key depends on the version of windows, a
nd I would rather not go down that road)
Any help, stories about similar situations, etc., would be appreciated.

Vitrick and Andre -
Even better might be to use one of the Windows API calls
"GetSystemDirectory" or "GetWindowsDirectory" located in the KERNEL32.DLL.
See MSDN for documentation of the calls.
Regards,
James
"andre@carya" wrote in message
news:4059b191@newsgroups....
> Hello Vitrick,
>
> With just a quick look at your problem I think you are looking for the
> windows system variables found in the "My computer>settings>enviromental
> variables", mine is called windir. Sometimes It's called %WINDOWS% I
think.
>
> I don't know exactly how to implement these variables.
>
> Greetz,
>
> Andr�
> "Victrick" schreef in bericht
> news:[email protected]...
> > Howdy all,
> >
> > I've got a program that is complete, and offers some basic service.
> > Advanced users will have the option of additional functionality. When
> > users decide to use this program, they decide what capabilities they
> > want - whether it provides just the base functionality, or if it has
> > the advanced functionalities. The additional functionality relies on
> > the installation of an additional LabVIEW component. In this case,
> > the base package requires simply the LabVIEW(7) runtime engine.
> > However the additional functionalities are vision related and require
> > the installation of the IMAQ Vision 7 Development Module. I would
> > like my program to detect the installation of the vision module on the
> > user's computer, and give the user access to these vision functions
> > ONLY if the vision pack is installed. (ie, I don't want to have two
> > versions of the program - the user only installs one complete version,
> > but some components will be hidden if they don't have the vision
> > module)
> >
> > Currently, this program checks the Window's system32 directory for the
> > presence of the imaq.dll and the nivision.dll. Right now, this system
> > *sort of* works on most computers, but if the user has their windows
> > installed in a non-standard windows directory (say they installed
> > windows to "windoze" or something other than the standards like
> > "Windows" and "Winnt")
> >
> > Does anyone know of a way to programmatically detect the installation
> > of the Vision module? What I'm doing right now would work in 95% of
> > the cases (I think) if I could nail down the root windows directory
> > (which I'm pretty sure is stored in the registry for all Windows
> > versions, but the name of the key depends on the version of windows,
> > and I would rather not go down that road)
> >
> > Any help, stories about similar situations, etc., would be
> > appreciated.
>
>

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