Using field symbols in method issue

[Former Member]

HI All

I created a method as follows and the problem is that when i enter

to the method the i have dump since the field symbol is not

assigned

there is a nice way that i can by-pass this issue ,

the reason that i created a method for that is that

i need to do this operation several of time in my code

The signature

LS_TARGET_STR	Importing	Type	Z_ATTR_STRUCT

ES_ATTR	        Exporting	Type	ANY

THe code

FIELD-SYMBOLS <ls_attr> TYPE any.

  DATA lo_attr TYPE REF TO data.



  CREATE DATA lo_attr TYPE (ls_target_str).

  ASSIGN lo_attr->* TO <ls_attr>.



  es_attr = <ls_attr>.

Regards

Alex

Edited by: Alex Dean on Nov 21, 2010 5:13 PM

[Clemenss]

Hi,

I think you pass something that is not defined as dictionary type

CREATE DATA lo_attr TYPE (ls_target_str)

You can check using

IF lo_attr is bound.
  ASSIGN lo_attr->* TO <ls_attr>.
else.
  raise exception ... "invalid type
endif.

Regards

Clemens

[Former Member]

HI

The problem is that i call to the method and <ls_structure> is not assigend yet

since than i get dump

convert_types(

EXPORTING

ls_target_str = ls_target_node-data-attribute_struct

IMPORTING

es_gsdo_attr = <ls_structure>

).

Regards

Alex

[Clemenss]

Hi Alex,

you can not pass an unassigned field-symbol (<ls_structure>) to a methods (or FORM or FUNCTION) parameter. A field-symbol is like a pointer: If it is not assigned, it points to nowhere.

You can define the parameter as a reference variable, ES_STRUCT_REF TYPE REF TO DATA.

In the method, you can

CREATE DATA ES_STRUCT_REF  TYPE (ls_target_str).

You call the method using a local data reference

DATA: lr_struct type ref to data.
  convert_types(
    EXPORTING
      lls_target_str = ls_target_node-data-attribute_struct 
    IMPORTING
      ES_STRUCT_REF   = lr_struct ).
if lr_struct is bound.
  assign lr_struct to <ls_structure>.
endif.

Regards,

Clemens

[Former Member]

Hi Clemens LI

now i am facing differnt issue

FIELD-SYMBOLS <ls_attr> TYPE any.
 
  DATA lo_attr TYPE REF TO data.
 
 
 
  CREATE DATA lo_attr TYPE (ls_target_str).
 
  ASSIGN lo_attr->* TO <ls_attr>.
 
 
  es_attr = <ls_attr>. <- here i have dump!

How can i overcome it ?

Regards

Alex

[Clemenss]

Hi Alex,

read the whole thread carefully.

And if you get a dump, read the dump carefully.

And if you ask a quastion, give detailed error description.

Regards,

Clemens

[Former Member]

Hi Clemens LI

now i am facing differnt issue

FIELD-SYMBOLS <ls_attr> TYPE any.

DATA lo_attr TYPE REF TO data.

CREATE DATA lo_attr TYPE (ls_target_str).

ASSIGN lo_attr->* TO <ls_attr>.

es_attr = <ls_attr>. <- here i have dump!

the problem is that i am using the following sighature to this method

LS_TARGET_STR	Importing	Type	Z_ATTR_STRUCT
 
ES_ATTR	        Exporting	Type	ANY

this is export parameter

How can i overcome it ?

[matt]

What is the value of ls_target_str on entry to the method? What is the value of sy-subrc after the assign? (4).

[Clemenss]

Hi Alex,

you refuse to follow any recommendation.

I will not follow this thread any longer.

Regards,

Clemens

[Former Member]

Hi

Clemens is right.....can you say what you can read on the dump?

You should transfer the data if the ASSIGN is ok only:

ASSIGN lo_attr->* TO <ls_attr>.
if sy-subrc = 0.
  es_attr = <ls_attr>
endif.

But it's hard to give you a solution without to know the dump

Max

[Former Member]

HI Matt

The value of the field is acatully data (this part working Ok)

and after the assign the sybrc = 0.

the problem is with the statment

es_attr = <ls_attr>.

The statment is

DATA: lr_struct TYPE REF TO data.

    con_types(
      EXPORTING
        ls_target_str = ls_target_node-data-attribute_struct    " Name of Attribute Structure of Node Entity
      IMPORTING
        es_attr  = lr_struct
    ).

And the signature is

LS_TARGET_STR	Importing	Type	Z_ATTR_STRUCT
 
ES_ATTR	        Exporting	Type	ANY

The code of convert types is

FIELD-SYMBOLS <ls_attr> TYPE any.
 
DATA lo_attr TYPE REF TO data.
 
 
CREATE DATA lo_attr TYPE (ls_target_str).
 
ASSIGN lo_attr->* TO <ls_attr>.
 
 
es_attr = <ls_attr>.

***********This is the place that i am

getting the dump . with -> es_attr = <ls_attr>

maybe its becouse that lr_struct is defiend type ref to data .

How can i solve this issue ?

Thanks,

Regards

Alex

Edited by: Alex Dean on Nov 22, 2010 9:36 AM

[Former Member]

Hi

The problem is the variable transfered to exporting paramenter is:

DATA: lr_struct TYPE REF TO data.

and the exporting paramenter is

ES_ATTR	        Exporting	Type	ANY

The 2 type are not incompatible

The exporting parameter has to has the same type of the variable, so u can define you exporting parameter like REF TO DATA

Max

[Former Member]

HI max

Now Im getting to my first problem

since when i put a field symbol as export parameter as the code below

I get a dump when i enter the method

so how can i solve this issue nicely.

data <ls_structure> type any .

convert_types(
EXPORTING
ls_target_str = ls_target_node-data-attribute_struct
IMPORTING
es_gsdo_attr = <ls_structure>
).

Thanks

Alex

[Former Member]

Hi

you define the variable and exporting parameter as TYPE REF TO DATA:

CLASS lcl_class DEFINITION.
  PUBLIC SECTION.
    CLASS-METHODS: conv_type IMPORTING i_structure TYPE any
                             EXPORTING e_structure TYPE REF TO data.
ENDCLASS.                    "lcl_class DEFINITION


CLASS lcl_class IMPLEMENTATION.
  METHOD conv_type.
    create data e_structure type (i_structure).
  ENDMETHOD.                    "conv_type
ENDCLASS.                    "lcl_class IMPLEMENTATION

DATA: my_strcture TYPE REF TO data.

FIELD-SYMBOLS: <fs_struct> TYPE ANY.

START-OF-SELECTION.

  CALL METHOD lcl_class=>conv_type
    EXPORTING
      i_structure = 'BKPF'
    IMPORTING
      e_structure = my_strcture.
  ASSIGN my_strcture->* TO <fs_struct>.

  SELECT SINGLE * INTO <fs_struct>
    FROM bkpf WHERE bukrs = '1000'.

  WRITE sy-subrc.

Max

[Former Member]

HI Max

Thanks,

Do you think that this is the best way to handle it ?

since i use in many places in my code

and i think to replace it with one method that

can handle this issue.

CREATE DATA lo_attr TYPE (ls_target_str).

ASSIGN lo_attr->* TO <ls_attr>.

Thanks again

ALex

[Former Member]

Hi

I don't know if it's the best soltuion because I don't know what your program does or what you really need to do, but if you need to create an object dynalically, this is should be instanced out of method if you need to use it out of class.

Max

[Former Member]

Hi

I don't know why you wan to use the CLASS, but you can considere to use FORM (But a METHOD is good too) and elaborate a global variable:

DATA: my_strcture TYPE REF TO data.

FIELD-SYMBOLS: <fs_struct> TYPE ANY.

START-OF-SELECTION.

  PERFORM conv_type USING 'BKPF'.

  SELECT SINGLE * INTO <fs_struct>
    FROM bkpf WHERE bukrs = '1000'.

  WRITE sy-subrc.

  PERFORM conv_type USING 'BSEG'.

  SELECT SINGLE * INTO <fs_struct>
    FROM bseg WHERE bukrs = '1000'.

  WRITE sy-subrc.

FORM conv_type USING i_structure.
  CREATE DATA my_strcture TYPE (i_structure).
  ASSIGN my_strcture->* TO <fs_struct>.
ENDFORM.                    "conv_type

Or

DATA: my_strcture TYPE REF TO data.

FIELD-SYMBOLS: <fs_struct> TYPE ANY.
*
CLASS lcl_class DEFINITION.
  PUBLIC SECTION.
    CLASS-METHODS: conv_type IMPORTING i_structure TYPE any.
ENDCLASS.                    "lcl_class DEFINITION
*
CLASS lcl_class IMPLEMENTATION.
  METHOD conv_type.
    CREATE DATA my_strcture TYPE (i_structure).
    ASSIGN my_strcture->* TO <fs_struct>.
  ENDMETHOD.                    "conv_type
ENDCLASS.                    "lcl_class IMPLEMENTATION

START-OF-SELECTION.

  lcl_class=>conv_type( 'BKPF' ).
  SELECT SINGLE * INTO <fs_struct>
    FROM bkpf WHERE bukrs = '1000'.

  WRITE sy-subrc.

  lcl_class=>conv_type( 'BSEG' ).
  SELECT SINGLE * INTO <fs_struct>
    FROM BSEG WHERE bukrs = '1000'.

  WRITE sy-subrc.

[Former Member]

Accatually this method is not related to the program

since this is generic one

I just waht

so the import ls_target_str can be any structrue

so here i dont have any problem (type ref to data)

and the output should be type any since it can be any structure.

this is a no problem to do but the issue

is with the export parameter (field symbol ) when i put it on the method

i have dump since the field-symbol is not assiged

and i dont know how to create the empty assign before

i call to the method

i know that in table there is append initail line to <fs_table>

CREATE DATA lo_attr TYPE (ls_target_str).

ASSIGN lo_attr->* TO <ls_attr>.

unfortunately we are using a class and i cant use perform there

Thanks

Alex

Edited by: Alex Dean on Nov 22, 2010 10:25 AM

[Former Member]

Hi

The problem is you can't define a generic type, but you can use TYPE ANY for field-symbol or in the interface parameter only.

So if you want to create a class to define an object dynamically, the exporting parameter has to be a REF TO DATA, that means you need to assign it to field-symbol out of the class

Max

[matt]

You cannot give an assignation to a field-symbol by calling a method. The ASSIGN must be local. I've written many programs where I pass the reference around and then dereference within a method.

matt

[Former Member]

Maybe i try to found the answer in OO forum