[Dev-C++] C++ Prolog Data transfer

[Narayan A. <nan...@ly...>]

Hi,

   I am trying to construct a simple example for querying the prolog engine from C++. The following is the simple prolog code (test.pl) to which I am trying to connect

% Prolog file test.pl for testing Connectivity from C %

 % Receives a string and outputs the same %

 receive(S):- write('I received '),write(S),nl.

 relation(abe,john).

And, following is the C++ code: 

void loadit(){
   PlFrame fr;
   PlTermv av(1);
   av[0] = "test.pl";
   PlQuery q("consult", av);
   q.next_solution();
}


void start(){
 PlTermv av(1);
 av[0] = "message";
 PlQuery q("receive",av);
 q.next_solution();
}

int main( int argc, char *argv[] )
{
  char *program = argv[0];
  char *plav[2];

  plav[0] = program;
  plav[1] = NULL;
  
  if ( !PL_initialise(1, plav) )
  PL_halt(1);
 
  loadit();
  start();
  return 0;
}

The above program works fine and I am able to get the output: "I received message" in the console. Now, my concern is to pass two arguments to the fact "relation", one of them is "abe" and other I want it to be a variable , so that I get the result "john" assigned to it. How do I construct such a query and how do I access the result and use it as a C data for other purposes?  

Could someone please answer?

Thanks,
Narayan.


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