First let me state that LabWindows/CVI is an ANSI C compiler and does not support C++. Also, there are no tools currently available that can convert LabWindows/CVI code to LabVIEW code, and vice-versa. However, CVI code can be built into DLLs which can be called within LabVIEW and LabVIEW code can be built into DLLs that are callable from CVI. LabWindows is a 32-bit C compiler that includes many helpful libraries. However, many of these libraries are available on multiple platforms (Win32, Solaris, and HP-UX).
A good online resource for CVI information is:
http://www.ni.com/support/cvisupp.htm
Jeremiah Cox
Applications Engineer
National Instruments
http://www.ni.com/ask