Node:Evaluating a query with side effects, Next:Handling exceptions in Visual Basic, Previous:Retrieving variable values, Up:How to call Prolog from Visual Basic
If you are only interested in the side effects of a predicate you can
execute it with the PrologQueryCutFail function call, which will
find the first solution of the Prolog goal provided, cut away the rest
of the solutions, and finally fail. This will reclaim the storage used
by the call.
Example: this is how a Prolog file can be loaded into the Visual Basic program:
ret = PrologQueryCutFail("load_files(myfile)")
This code will return 1 if myfile was loaded successfully, and -1
otherwise (this may indicate, for example, the existence_error
exception if the file does not exist).