Why PI Acton Labview toolkit is not free but C++ SDK is free

Now i am using PI Acton Spectrapro 2300i.
and want to develop our software to control the system
but the company told us the C++ SDK is free
but the labview Toolkit is not free.
Why ,for i have owned the dlls about the system ,if i can call the dlls in the labview.So the labview should be also free.
Are three some problems when calling C++ in Labview,or need some driver when using Labview??
Thanks very much

You should ask the supplier about why they charge for the LabVIEW toolkit
and not for the C++ SDK.
Calling C++ dlls is not easy from LabVIEW, unless the functions are exported
as c functions. The C++ naming convention is something LabVIEW cannot
understand. A C++ dll doesn't automatically mean it uses a C++ naming
convention, so you'll have to check. Open the dll in a call library node and
see if the names you'd expect are there. If they are available, and you
don't see strange signs like _, *, &, # or @ in the names, it's probably
easy to call from LabVIEW.
One way to deal with this is to make a C/C++ wrapper that does use C naming
so LabVIEW can understand it, but you can't do that in LabVIEW.
Regards,
Wiebe.

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