Hey SL Ong, What OS are you using this on? Do you get an error when trying to use the Call Library Function Node, or does the list of functions just not populate? What version of LabVIEW are you using? Here is another forum post discussing the library node.
Hey SL Ong, Have you tried specifying the functions yourself? Here is another discussion forum post discussing using dlls in LabVIEW, and here is the link it references on how to use dlls. Please post back with more questions or problems. Thanks!!