Re: [JPL][DCG] Load .pl file from internet

Dear Paul Singleton,

Thank you so much, I did it!
Just load library (http/http_load) before consult file.


Best regards,
Nhat HV.

On Dec 6, 2013, at 12:04 AM, Paul Singleton <[email protected]> wrote:

> On 05/12/2013 15:57, Nhat HV wrote:
>> Hi experts,
>> 
>> I am able to use prolog with JPL. I try to load .pl file from internet, but, some errors occur. What should I do for loading a pl file from internet?
> 
> First debug your Prolog code.
> 
> JPL is merely reporting an error thrown by consult/1
> 
> You can't consult from a URL atom unless you've loaded library(http/http_load)
> 
> Get it working at a Prolog console first.
> 
> Good luck
> 
> Paul Singleton
> 
> 
> 
> 
>> I have taken demo :
>> 
>> —
>> JPL.init();
>> 
>>         Term consult_arg[] = {
>>             new Atom(ExampleJPL001.class.getResource(
>>             "demo001.pl").getPath())
>>         };
>>         Query consult_query
>>                 = new Query(
>>                         "consult",
>>                         consult_arg);
>> 
>>         boolean consulted = consult_query.hasSolution();
>> 
>>         System.out.println("consult " + (consult_query.hasSolution() ? "succeeded" : "failed"));
>> 
>>         if (!consulted) {
>>             System.err.println("Consult failed");
>>             System.exit(1);
>>         }
>> —
>> 
>>  it is OK. But, when I use this code for Java/Servlet:
>> 
>> —
>>         String filePath = "http://localhost:8080/Website/prolog/demo001.pl";
>> 
>>         System.out.println("filePath = " + filePath);
>> 
>>         Term consult_arg[] = {
>>             new Atom(
>>             filePath)
>>         };
>>         Query consult_query
>>                 = new Query(
>>                         "consult",
>>                         consult_arg);
>> 
>>         boolean consulted = consult_query.query();
>> —
>> 
>> there is the error:
>> 
>> —
>> jpl.PrologException: PrologException: error(existence_error(source_sink, 'http://localhost:8080/Website/prolog/demo001.pl'), _0)
>> —
>> 
>> 
>> Best regards,
>> Nhat HV.
>> 
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