Foreign language demo for Windows

This directory contains two examples of foreign-language extensions.

• dlltest.dll Simple code illustrating very basic functionality of the interface. Load it using:

  ?- load_foreign_library(dlltest).
  

  It defines the following predicates:

  • say_hello(+Text) Shows a simple Windows message-box containing Text.
  • mclock(-MilliSeconds) Return the number of milli-seconds elapsed since the library was loaded.
  • rlc_color(+Which, +R, +G, +B) Set the color of the plwin window. Which is one of {window, text, highlight, highlighttext}, RGB are integers between 0 and 255 for the color components.

  In addition, it illustrates how to hook into a Prolog abort.

• plregtry.dll Defines predicates to access the Windows registry. It is a much more elaborate example, and also a useful library. Its not documented, but with some knowledge of the Windows API it should be fairly easy to figure out how it works.