What is the wrong in this code

[Former Member]

*&---------------------------------------------------------------------*
*& Report  ZTESTTEST
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT  ztesttest LINE-SIZE 256.
TYPE-POOLS: slis.

FIELD-SYMBOLS: <dyn_table> TYPE STANDARD TABLE ,
               <dyn_wa>,
               <dyn_field>.
FIELD-SYMBOLS: <dyn_table1> TYPE STANDARD TABLE ,
               <dyn_wa1>,
               <dyn_field1>.

DATA: alv_fldcat TYPE slis_t_fieldcat_alv,
      it_fldcat TYPE lvc_t_fcat.

TYPE-POOLS : abap.

DATA : it_details TYPE abap_compdescr_tab,
       wa_details TYPE abap_compdescr.
DATA :itab TYPE abap_component_tab.
*----------------------------------------------------------------------*
*       CLASS cl_my_structure  DEFENITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS cl_my_structure DEFINITION.
  PUBLIC  SECTION.
    METHODS: x.
  PROTECTED SECTION.

  PRIVATE SECTION.



ENDCLASS.                    "cl_my_structure  DEFENITION
*----------------------------------------------------------------------*
*       CLASS cl_my_structure IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS cl_my_structure IMPLEMENTATION.
  METHOD x.
    WRITE 'HI'.
  ENDMETHOD.                    "x
ENDCLASS.                    "cl_my_structure IMPLEMENTATION


DATA : ref_descr TYPE REF TO cl_abap_structdescr.

DATA: new_table TYPE REF TO data,
      new_line  TYPE REF TO data,
      wa_it_fldcat TYPE lvc_s_fcat.

SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text .
PARAMETERS: p_table(30) TYPE c DEFAULT 'T001'.
SELECTION-SCREEN END OF BLOCK b1.

* Get the structure of the table.
ref_descr ?= cl_abap_typedescr=>describe_by_name( p_table ).

[Former Member]

use start-of-selection.

<b>START-OF-SELECTION.</b>

• Get the structure of the table.

ref_descr ?= cl_abap_typedescr=>describe_by_name( p_table ).

[Former Member]

<b>abap_component_tab</b> does not exist...At least not on my system....Comment that and works fine....

Greetings,

Blag.

[Former Member]

Hi,

In the type pool there is no component called abap_component_tab.

DATA :itab TYPE abap_component_tab.

The above line is error in the code.

And also last line is also wrong

ref_descr ?= cl_abap_typedescr=>describe_by_name( p_table )

Reward if helpful.

[Former Member]

Sorry Shankar,

This is not the error. Just comment the method X then you will not find the error.

Regards,

Lisa.

[RichHeilman]

That depends on what you want it to do. Do you want it to write "Hi"? If so...

report  ztesttest line-size 256.
*type-pools: slis.
*
*field-symbols: <dyn_table> type standard table ,
*               <dyn_wa>,
*               <dyn_field>.
*field-symbols: <dyn_table1> type standard table ,
*               <dyn_wa1>,
*               <dyn_field1>.
*
*data: alv_fldcat type slis_t_fieldcat_alv,
*      it_fldcat type lvc_t_fcat.
*
*type-pools : abap.
*
*data : it_details type abap_compdescr_tab,
*       wa_details type abap_compdescr.
*data :itab type abap_component_tab.
*----------------------------------------------------------------------*
*       CLASS cl_my_structure  DEFENITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
class cl_my_structure definition.
  public  section.
    methods: x.
  protected section.

  private section.



endclass.                    "cl_my_structure  DEFENITION
*----------------------------------------------------------------------*
*       CLASS cl_my_structure IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
class cl_my_structure implementation.
  method x.
    write 'HI'.
  endmethod.                    "x
endclass.                    "cl_my_structure IMPLEMENTATION


*data : ref_descr type ref to cl_abap_structdescr.
*
*data: new_table type ref to data,
*      new_line  type ref to data,
*      wa_it_fldcat type lvc_s_fcat.

data: o_ref type ref to cl_my_structure.

selection-screen begin of block b1 with frame title text .
parameters: p_table(30) type c default 'T001'.
selection-screen end of block b1.

start-of-selection.    "<--  YES, YOU NEED THIS.

create object o_ref .
call method o_ref->x.

* Get the structure of the table.
*ref_descr ?= cl_abap_typedescr=>describe_by_name( p_table ).

Regards,

RIch Heilman

[Former Member]

Hi `Rich,

I understood what you mean to ask me but my question is diffrent. On the sysntax check i am getting an error. When i comment the method in the local class then the syntax error will not exist.

Could you please explain me what is the reason for it.

Regards,

Lisa.

[RichHeilman]

What is the error?

Regards,

RIch Heilman

[Former Member]

I'm not sure what you are exactly trying to achieve, but at a glance the code is missing the event heading start-of-selection making the last statement inaccessable.

Also you aren't invoking any of the methods in your local class.

You'd need something like this after the selection screen definition.

-

---

start-of-selection.

data: lv_my_obj type ref to cl_my_structure.

create object lv_my_obj.

lv_my_obj->x( ).

• Get the structure of the table.

ref_descr ?= cl_abap_typedescr=>describe_by_name( p_table ).

-

---

Regards

Darren

[Former Member]

Hi,

May i know why do i need toput this start of selection?

Regards,

Lisa.

[Former Member]

Hi Lisa,

This events lets the system know from where the execution of code will start.

Ashven