Re: Programmatically consulting a prolog file

Hello

are you sure pl2wam.exe is in your PATH variable (pl2wam is called by
consult/1 to compile the Prolog file before loading) ?

You can also use Pl_Get_Exception() to obtain the term associated to
the exception raised by consult/1. You can for instance display it on
the stdout using:

Pl_Write_Simple(Pl_Get_Exception());

for Pl_Write_Simple() you can add the following

void Pl_Write_Simple(PlTerm term_word);

If you cannot solve the problem give us the message of the exception.

Daniel

josh b a écrit :

Hey,

I'm trying to access Prolog from within my C++ code (Using Visual C++
2008 Express). I have it mostly working now. I am able to successfully
write a C++ program, build it (In MSVC, not using glpc) and call
predicates like write/1 and absolute_file_name/2. However, I have my
own Prolog files I wish to consult from within the C ++code.

I figured I'd just call the consult/1 predicate with the name of the
.pl file. But the Pl_Query_Call returns a PL_EXCEPTION. I even tried using absolute_file_name/2
to construct the filename for consult/1 (To be 100% sure I was using
the right name). Sure enough, absolute_file_name/2 can find the file,
but consult/1 still fails.

Here is an excerpt from my code:

int func;

PlTerm arg[10];

int res;

Pl_Start_Prolog(argc, argv);

//This correctly unifies arg[1] with the absolute file name of
new_main.pl, e:/new_main.pl

func = Pl_Find_Atom("absolute_file_name");

Pl_Query_Begin(PL_TRUE);

arg[0] = Pl_Mk_String("new_main.pl");

arg[1] = Pl_Mk_Variable();

res = Pl_Query_Call(func, 2, arg);

Pl_Query_End(PL_RECOVER);

//This should load in all predicates in the file new_main.pl

func = Pl_Find_Atom("consult");

Pl_Query_Begin(PL_TRUE);

arg[0] = arg[1];

res = Pl_Query_Call(func, 1, arg);

Yet, it just returns and exception. Even if I try to proceed and try to
Pl_Find_Atom on any of the predicates from the file, they just fail.

I also tried adding the argument "--init-goal
consult('e:/new_main.pl')" to argv in Pl_Start_Prolog. No dice there
either.

I'd really like to do my work from with the MSVC IDE, so any help with
programmatically consulting the prolog file would be much appreciated.

Cheers,

Josh

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