LabVIEW can call DLLs. Thus, you could compile the C code into a DLL. My suspicion, however, is that the C code you have is probably written to be an application. This means you would need to take the relevant parts (i.e., the basic functions) and compile that into a DLL that you can call from LabVIEW. More information on calling DLLs from LabVIEW can be found in the LabVIEW Help, as well as Knowledge Base articles (just do a search on calling a DLL from LabVIEW). Examples also ship with LabVIEW.
