topic Re: Rgarding oops report in Application Development and Automation Discussions

Rgarding oops report

Former Member — Thu, 12 Jun 2008 07:04:48 GMT

Hi firends,

I have created simple ooops report . its going dump . It is saying that "Access via 'NULL' object reference not possible." Please rectify this code.

The copde is below:

&----

*& Report YCLASS_OOPS_BANK

&----

REPORT yclass_oops_bank.

DATA: act TYPE REF TO zaccountaa.

DATA: bal TYPE i.

SELECTION-SCREEN BEGIN OF BLOCK a. .

PARAMETERS: p_amnt TYPE dmbtr,

p_dep TYPE dmbtr,

p_witd TYPE dmbtr.

SELECTION-SCREEN END OF BLOCK a.

START-OF-SELECTION.

clear act.

CALL METHOD act->set_balance( p_amnt ).

WRITE:/ 'SET BALANCE', p_amnt.

bal = act->deposit( p_dep ).

write:/ 'Deposited ', p_dep ,' bucks making balance to ', bal.

bal = act->withdraw( p_witd ).

write:/ 'Withdrew ', p_witd ,' bucks making balance to ', bal.

thnaks

vvv

Re: Rgarding oops report

Former Member — Thu, 12 Jun 2008 07:13:24 GMT

hi,

DATA: act TYPE REF TO zaccountaa.

this act is reference to class but it has only null value

it donot point the class

when u

create object act.

then it points to the class

add the create object statment.

Reward points if helpful

Regards,

priya.

Re: Rgarding oops report

Former Member — Thu, 12 Jun 2008 07:24:26 GMT

Check the code below:

REPORT yclass_oops_bank.

DATA: act TYPE REF TO zaccountaa.

DATA: bal TYPE i.

SELECTION-SCREEN BEGIN OF BLOCK a. .

PARAMETERS: p_amnt TYPE dmbtr,

p_dep TYPE dmbtr,

p_witd TYPE dmbtr.

SELECTION-SCREEN END OF BLOCK a.

START-OF-SELECTION.

TRY.
CREATE OBJECT act
  EXPORTING
    class_name         = 'zaccountaa'
*    logical_port_name  =
    .
CATCH (Exception Name).
ENDTRY.

clear act.

CALL METHOD act->set_balance( p_amnt ).

WRITE:/ 'SET BALANCE', p_amnt.

bal = act->deposit( p_dep ).

write:/ 'Deposited ', p_dep ,' bucks making balance to ', bal.

bal = act->withdraw( p_witd ).

write:/ 'Withdrew ', p_witd ,' bucks making balance to ', bal.

Regards

Kannaiah

Re: Rgarding oops report

former_member69765 — Thu, 12 Jun 2008 07:26:29 GMT

Of course it will dump !!

Because you have not created a object of the class.

If you know C++ or JAVA..

In C++ and JAVA we do act = new zaccountaa.

similar to that you need to create a object in ABAP by statement

CREATE_OBJECT act type zaccountaa.

If your constructor is expecting some parameters then you need to pass them else this will suffuice.

Re: Rgarding oops report

Former Member — Thu, 12 Jun 2008 07:55:33 GMT

hi,

sine u have not created an object the short dump is being raised.

so use the following code.

if not acc is bound.

create object acc.

(note: pass the values to the signature of the constructor if u have defined any instance constructor in the class).

endif.

reward points if useful