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How do I incorporate a DLL written in C into my Visual Prolog project?

You have two possibilities:

  1. Static Linking. In this case you need to find a .LIB, which corresponds to this .DLL. (Ask the implementor of the .DLL). You can then just include the .LIB file into your project, declare the routines in the .DLL as global predicates and call these as if they were other Prolog predicates.
  2. Dynamic Linking. This way is a little more complex. Read the description of the
    Go into the VIP help file and read about: LONG /*DllHandle =*/ vpi_LoadDll(STRING FileName)