Obtain List of Field Symbols Declared and Assigning from ITAB DATA

Question

Hi Gurus,
3 simple problems (apparently , appreciate responses.
Problem 1
How to get the list of names of <field-symbols> of type table declared in an abap program?
Problem 2
Create DATA "XXXX" TYPE TABLE OF ty_fcat. Where "XXX" name is obtained from an internal table with data names...Can i use the read the statement on the internal table and creat the DATA?
Problem 3
Matching the name of the field-symbol obtained from the abap program with a "name" stored in an ITAB. If the name matches do the following:-
  CREATE DATA 'XXXX' TYPE TABLE OF ty_fcat. (remember 'XXXX' is obtained by reading internal table.
  ASSIGN 'XXXX->* TO <ITAB> (obtained from the abap program)
Appreciate guidance on this matter. thank you!!!! God Bless!
Edited by: Salman Akram on Sep 27, 2010 4:03 PM
Edited by: Rob Burbank on Sep 27, 2010 2:59 PM

Answer 1

Hi Salman,
1) Once you assign some table to your field symbol, its dynamic type will be the same as the table assigned.
So you use the same approach as described in your last thread.
"suppose you have a table assigned to <tab>
"describe it by name
lr_tabdescr ?= cl_abap_typedescr=>describe_by_data( <tab> ).
lr_strucdescr ?= lr_tabdescr->GET_TABLE_LINE_TYPE( ).
"and get its line type components
it_components = lr_strucdescr->get_components( ).
loop at it_components.
"show all component names
  write: it_components-name.
endloop.
2) This statement has such form
data lr_data type ref to data.
CREATE DATA lr_data TYPE ...
In here lr_data must be data reference  (no its name). TYPE can be provided dynamically in form of ('SOME_DDIC_TYPE'). So in your case this statement is not correct. You can't provide lr_data dynamically.
So this one you will have to elaborate a bit in order we could understand what you want to achieve.
3) Here I totally don't know what you mean. I think this relates somehow to first two points. So please tell us what is the requirement from the scratch, maybe this will shed more light on your issue.
BTW: Please post such questions in ABAP General as this is not DDIC related issue.
Regards
Marcin