Toolkit Tutorial: Programming



  
dt_Handle
 
molecule1
,
 
moleculeX
;


  

/* The next item gives the first molecule. */

  

molecule1
 
=
 
dt_next
(
container
);

  

if
 
(
dt_getrole
(
molecule1
,
 
reaction
)
 
==
 
DX_ROLE_REACTANT
)

    

printf
(
"The molecule role is reactant.\n"
);


  

/* The next item gives the second molecule */

  

moleculeX
 
=
 
dt_next
(
container
);

  

if
 
(
dt_getrole
(
moleculeX
,
 
reaction
)
 
==
 
DX_ROLE_PRODUCT
)

    

printf
(
"The molecule role is product.\n"
);


  

/* 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"
);


  

/* Each molecule refers to the reaction as its parent. */

  

if
 
(
dt_parent
(
molecule1
)
 
==
 
reaction
)

    

printf
(
"You can access the reaction through the molecule.\n"
);