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POargv Memory Allocation
 

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    <p>I was wondering if someone could tell me what I am doing wrong that I get this Unhandled Exception error message:</p> <pre><code>0xC0000005: Access violation reading location 0x0000000c. </code></pre> <p>with a green pointer pointing at my first Prolog code (fid_t):</p> <p>Here is my header file:</p> <pre><code>class UserTaskProlog { public: UserTaskProlog( ArRobot* r ); ~UserTaskProlog( ); protected: int cycles; char* argv[ 1 ]; term_t tf; term_t tx; term_t goal_term; functor_t goal_functor; ArRobot* robot; void logTask( ); }; </code></pre> <p>And here is my main code:</p> <pre><code>UserTaskProlog::UserTaskProlog( ArRobot* r ) : robot( r ), robotTaskFunc( this, &amp;UserTaskProlog::logTask ) { cycles = 0; argv[ 0 ] = "libpl.dll"; argv[ 1 ] = NULL; PL_initialise( 1, argv ); PlCall( "consult( 'myPrologFile.pl' )" ); robot-&gt;addSensorInterpTask( "UserTaskProlog", 50, &amp;robotTaskFunc ); } UserTaskProlog::~UserTaskProlog( ) { robot-&gt;remSensorInterpTask( &amp;robotTaskFunc ); } void UserTaskProlog::logTask( ) { cycles++; fid_t fid = PL_open_foreign_frame( ); tf = PL_new_term_ref( ); PL_put_integer( tf, 5 ); tx = PL_new_term_ref( ); goal_term = PL_new_term_ref( ); goal_functor = PL_new_functor( PL_new_atom( "factorial" ), 2 ); PL_cons_functor( goal_term, goal_functor, tf, tx ); int fact; if ( PL_call( goal_term, NULL ) ) { PL_get_integer( tx, &amp;fact ); cout &lt;&lt; fact &lt;&lt; endl; } PL_discard_foreign_frame( fid ); } int main( int argc, char** argv ) { ArRobot robot; ArArgumentParser argParser( &amp;argc, argv ); UserTaskProlog talk( &amp;robot ); } </code></pre> <p>Thank you,</p>
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