This directory contains two examples of foreign-language extensions.
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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.
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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.