Call Library Function can call functions in any DLL, regardless of what program created it. Different languages and compilers may have different calling conventions. See the document titled "Using External Code in LabVIEW" (which ships with LabVIEW) for more help. To find this document, from your diagram, right-click on the Call Library Funcrtion node, then select Help, then click on the link to Using External Code in LabVIEW.
