You can export the functions available on the COM interfaces from a type library (*.tlb file) using the following procedure:

1 - Open the Visual Studio command prompt

2 - Open the OLE/COM Object Viewer by executing the command “oleview”

3 - Then File » View Type Lib » inform the type library (*.tlb) file that you want the COM interface (E.g.: c:\foo.tlb)

4 - Now in ITypeLib Viewer, File » Save As… » and you can export all 3 files needed in you C++ project (.h, .idl, .c) from there.