Re: [Info-gnuprologjava] few questions about your package

[Daniel Thomas]

Hello,

Sorry for the terrible delay.

So what you want to do is send a line of text into the standard input so
that read_words can pull it out?

You might be able to use use set_input and use
TextInputPrologStream(OpenOptions,Reader) with Environment#open to get
the standard input for prolog to point at something other than
System.in.

Alternatively use Environment#setDefaultInputStream before you construct
the Environment and that input stream will be automatically used instead
of System.in.

I hope that helps,

Daniel

On Sun, 2011-12-25 at 12:46 +0300, Noor Ahmed wrote:
> Hello again,
> 
> I used the tips you gave me, but it's still not working. I am using
> WIN-Prolog, and in order to run the .pl code I have to write:
> 
>               ?- read_words(A).
>               :- "line of text for processing".
> 
> In the Java code, all I did was invoke the "read_words" method. And
> then, how can I send a line of text to the prolog code from Java? I
> can't use the line of text as an argument, I tried it and it won't
> work.
> 
> Here's where I'm stuck at:
> 
>     Environment en = new Environment();
> 
> en.ensureLoaded(AtomTerm.get("this://e-Q/src/pkginterface/code.pl"));
>     
>     Interpreter intr;
>     Term ans = null;
>     
>     intr = en.createInterpreter();
>     
>         
>     VariableTerm str = new VariableTerm(label.getText());
>     VariableTerm arg1 = new VariableTerm("A");
>     
>       Term[] args = {arg1};
>      
>      CompoundTerm goalTerm = new
> CompoundTerm(AtomTerm.get("read_words"), args);
>     
>      en.runInitialization(intr);
>      
>      Goal goal =intr.prepareGoal(goalTerm);  
>         try {
>             int rc = intr.execute(goal);
>         } catch (PrologException ex) {
> 
> Logger.getLogger(checkBalance.class.getName()).log(Level.SEVERE, null,
> ex);
>         } //I need to send the line of text after invoking the
> read_words method
>         
>         
>        ans = (AtomTerm) goalTerm.dereference();
>        
>        String check = ans.toString();
> 
> Thank you in advance.
> 
> Regards.
> 
> 
> On Wed, Dec 21, 2011 at 4:44 PM, Daniel Thomas <address@hidden>
> wrote:
>         How exactly is it not working properly?
>         
>         I won't compile as 'label.getText()"."' is invalid and you
>         don't need to
>         add in "." like that which might be the problem you are
>         getting when you
>         create the goalTerm as you put a . in when you don't need to.
>         The the
>         CompoundTerm is not being correctly constructed as the first
>         argument is
>         the functor and so should just be "read_words" without any
>         brackets or
>         arguments - that is what args is for.
>         
>         I hope that helps,
>         
>         Daniel
>         
>         
>         On Tue, 2011-12-20 at 21:35 +0300, Noor Ahmed wrote:
>         >
>         > Hello,
>         >
>         > I have a few questions about your package. The setup
>         instructions are
>         > not clear. I am using WIN-Prolog, and want to connect it to
>         an
>         > interface created in Java.
>         > In WIN-Prolog I have to write "read_words" to run the
>         program, which
>         > takes a line of string -that comes from the interface- for
>         processing.
>         >
>         > So this is the code I wrote, I'm very sure it's wrong
>         because it's not
>         > working properly:
>         > "
>         >
>         >     Environment en = new Environment();
>         >
>         >
>         
> en.ensureLoaded(AtomTerm.get("/Users/NetBeansProjects/e-Q/src/pkginterface/code.pl"));
>         >
>         >     Interpreter intr;
>         >     AtomTerm ans = null;
>         >
>         >     intr = en.createInterpreter();
>         >
>         >
>         >         VariableTerm str = new
>         VariableTerm(label.getText()".");
>         >
>         >       Term[] args = {str};
>         >
>         >      CompoundTerm goalTerm = new
>         CompoundTerm("read_words(A).", args);
>         >
>         >      en.runInitialization(intr);
>         >         try {
>         >             intr.runOnce(goalTerm);
>         >         } catch (PrologException ex) {
>         >
>         >
>         Logger.getLogger(checkBalance.class.getName()).log(Level.SEVERE, null,
>         > ex);
>         >         }
>         >
>         >        ans = (AtomTerm) goalTerm.dereference();
>         >
>         >         String check = ans.toString();
>         > "
>         >
>         > Please can you reply soon. Thank you.
>         >
>         >
>         > Regards.
>         >
>         
>         
>         
> 
>

signature.asc
Description: This is a digitally signed message part