topic Re: ABAP Objects Casting error in Application Development and Automation Discussions

ABAP Objects Casting error

Former Member — Thu, 25 Oct 2007 10:34:21 GMT

Hi,

I have declared two classes with names, ZCL_ONE, ZCL_TWO.

ZCL_TWO is inhering ZCL_ONE.

Now i am using them in the se38 program.

While i use it, Narrow casting is working fine, But widening casting is not working.

It is throwing an exception or a dump if i do not catch an exception.

DATA: OBJ1 TYPE REF TO ZCL_ONE,
           OBJ2 TYPE REF TO ZCL_TWO.
 CREATE OBJECT OBJ1.
 OBJ2 ?= OBJ1.

The above code is giving me dump. Any guesses about how to solve it.

I am able to work with the Narrow casting.. which is below code.. It is working fine.

DATA: OBJ1 TYPE REF TO ZCL_ONE,
          OBJ2 TYPE REF TO ZCL_TWO.
 CREATE OBJECT OBJ2. 
OBJ1 = OBJ2.

How to resolve the error.

Thanks in Advance.

Re: ABAP Objects Casting error

Former Member — Thu, 25 Oct 2007 10:52:13 GMT

obj1 should be the super(inherited) class of obj2....while using widening cast....

example:

INTERFACE i1.

DATA a1 TYPE ...

ENDINTERFACE.

INTERFACE i2.

INTERFACES i1.

ALIASES a1 FOR i1~a1.

DATA a2 TYPE ...

ENDINTERFACE.

CLASS c1 DEFINITION.

PUBLIC SECTION.

INTERFACES i2.

ENDCLASS.

CLASS c2 DEFINITION INHERITING FROM c1.

PUBLIC SECTION.

METHODS m1.

ENDCLASS.

...

DATA: iref TYPE REF TO i2,

cref TYPE REF TO c1.

...

CREATE OBJECT iref TYPE c2.

... iref->a1 ...

... iref->a2 ...

...

TRY.

cref ?= iref.

CALL METHOD cref->('M1').

CATCH cx_sy_move_cast_error

cx_sy_dyn_call_illegal_method.

...

ENDTRY.

Message was edited by:

Muthurajan Ramkumar