The quickest solution for you might be to compile your C++ code into a DLL which you can then call from LabVIEW. Did you write the C-code or did somebody else? Calling a DLL from LabVIEW isn't difficult, as long as you're dealing with simple data types. There's a really good example that ships with LabVIEW that shows you how to do this. Check the "Help->Find Examples." and then click the "Search" tab and look for "DLL".