Thread: Prolog code causing Access Violation error in VS2008

Does anyone know why including a term such as:

Code:

    t = PL_new_term_ref();

would cause an Unhandled Exception error message:

Code:

    0xC0000005: Access violation reading location 0x0000000c.

(Visual Studio 2008)


I have a header file:

Code:

    class UserTaskProlog : public ArAction
     {
      public:
              UserTaskProlog( const char* name = " sth " );
              ~UserTaskProlog( );
              AREXPORT virtual ArActionDesired *fire( ArActionDesired currentDesired );  

      private:
              term_t t;
     };

and a cpp file:

Code:

    UserTaskProlog::UserTaskProlog( const char* name ) : ArAction( name, " sth " )
     {
      char** argv;
      argv[ 0 ] = "libpl.dll";
      PL_initialise( 1, argv );
      PlCall( "consult( 'myProg.pl' )" );
     }

    UserTaskProlog::~UserTaskProlog( )
     {
     }

    ArActionDesired *UserTaskProlog::fire( ArActionDesired currentDesired )
     {
      cout << " something " << endl;
      t = PL_new_term_ref( );
     }

Without t=PL_new_term_ref() everything works fine, but when I start adding my Prolog code (declarations first, such as t=PL_new_term_ref), I get this Access Violation error message.

I'd appreciate any help.

Thanks,