Hello Greber,
If you are referring to classes in the C++ realm, LabWindows/CVI is an ANSI C programming environment, so you would not be able to directly create C++ classes. You can create you classes in C++ and use your code in CVI, if you create a C dll and use extern "C" to prevent name mangling.
Hope that helps.
Wendy L
LabWindows/CVI Developer Newsletter