CODEWITHSUNDEEP
c#prologffiswi-prolog
yk2
yk2

Reputation: 49

Integrating Prolog with C#

I am new to Prolog and C#. When I try to integrate Prolog with C# I found some errors,

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using SbsSW.SwiPlCs;


namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
           // Environment.SetEnvironmentVariable("SWI_HOME_DIR", @"the_PATH_to_boot32.prc");  // or boot64.prc
            if (!PlEngine.IsInitialized)
            {
                String[] param = { "-q" };  // suppressing informational and banner messages
                PlEngine.Initialize(param);
                PlQuery.PlCall("assert(father(martin, inka))");
                PlQuery.PlCall("assert(father(uwe, gloria))");
                PlQuery.PlCall("assert(father(uwe, melanie))");
                PlQuery.PlCall("assert(father(uwe, ayala))");
                using (var q = new PlQuery("father(P, C), atomic_list_concat([P,' is_father_of ',C], L)"))
                {
                    foreach (PlQueryVariables v in q.SolutionVariables)
                        Console.WriteLine(v["L"].ToString());

                    Console.WriteLine("all children from uwe:");
                    q.Variables["P"].Unify("uwe");
                    foreach (PlQueryVariables v in q.SolutionVariables)
                        Console.WriteLine(v["C"].ToString());
                }
                PlEngine.PlCleanup();
                Console.WriteLine("finished!");
            }
        }
    }
}

It is not running, Before run this I was add reference SwiPlCs.dll. But it shows error "FileNotFoundException was unhandled, The specified module could not be found. (Exception from HRESULT: 0x8007007E)".

So can anyone help me to fix this error?

I got this coding here

Upvotes: 4

Views: 1815

Answers (1)

VMAtm
VMAtm

Reputation: 28355

The link you've provided has full explanation of this error:

If libswipl.dll or one of its dependencies could not found you will recive an error like System.IO.FileNotFoundException: Das angegebene Modul wurde nicht gefunden. (Ausnahme von HRESULT: 0x8007007E)

An other common error is: 

SWI-Prolog: [FATAL ERROR:
  Could not find system resources]`  
  Failed to release stacks

To fix this add the SWI_HOME_DIR environment variable as described in SWI-Prolog FAQ FindResources with a statment like this befor calling PlEngine.Initialize.

Environment.SetEnvironmentVariable("SWI_HOME_DIR", @"the_PATH_to_boot32.prc");

This code is commented by default, Uncomment it and provide the correct path to the the_PATH_to_boot32.prc. As described in FAQ:

Solution

On Windows, it suffices to leave libswipl.dll in the installation tree (i.e., do not copy it elsewhere) and add the bin directory of the installation tree to %PATH%.

A cross-platform and robust solution is to use putenv() to put an appropriate path into the environment before calling PL_initialise().

...;
putenv("SWI_HOME_DIR=C:\\Program Files\\swipl");
if ( PL_initialise(argc, argv) )
  PL_halt(1);
...

In the final version of your application you link the saved-state to the executable (using swipl-ld or cat (Unix)) and comment the putenv() call.

Upvotes: 4

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