Toolkit Tutorial: Programming

  /* The next item gives the first molecule. */
  molecule1 = dt_next ( container );
  str = dt_arbsmiles ( & slen , molecule1 , 0 );
    printf ( "The molecule is %.*s\n" , slen , str );

  /* The next item gives the second molecule */
  moleculeX = dt_next ( container );
  str = dt_arbsmiles ( & slen , moleculeX , 0 );
    printf ( "The molecule is %.*s\n" , slen , str );

  /* The next item is the NULL object. */
  moleculeX = dt_next ( container );
  if ( NULL_OB == moleculeX )
    printf ( "The NULL object is next.\n" );

  /* A reset and next operation gives the first molecule again. */
  dt_reset ( container );
  moleculeX = dt_next ( container );
  if ( moleculeX == molecule1 )
    printf ( "Reset is like rewind.\n" );