get fieldname of dynamic structure by index

[Former Member]

Hello all,

how can i get the fieldname of a dynamic structure for example in a loop?

It is not really a problem but i am interested in an other solution.

Short example:

I create a dynamic structure and table of t001 named <t_table> and <w_struc>.

loop at <t_table> assigning <w_struc>.

do.

assign component sy-index of structure <w_table> to <field>.

• now i want to know when i have access to 'PERIV', is index 10 in T001

• i know 3 possibilities to get the name:

• 1: read table DD03L with tablename and index (=>low performance)

• 2: assign component 'PERIV' of structure <w_table> to <field>.

• 3: read itab lt_components with index (method lt_components = lref_struct_descr->get_components( ). )

• why i can't get the name direct from the reference lref_struct_descr like

lref_struct_descr->get_fieldname( sy-index )? This information has to be known at runtime too, i think?

enddo.

endloop.

[glen_spalding]

hello wolfgang, did you ever manage to find an answer to this ?

thanks

glen

[uwe_schieferstein]

Hello Wolfgang

I have two answers that are probably not satisfying to you:

(1) If you specifically want to access a field called 'PERIV' you do not need to go via the field index:

ASSIGN COMPONENT 'PERIV' OF STRUCTURE <gd_struc> TO <gd_fld>.

(2) Whereas a data object can be de-referenced to a field-symbol (e.g.)

  CREATE DATA gdo_data TYPE TABLE OF ('T001').
  ASSIGN gdo_data->* TO <gt_table>.

you cannot do this with classes or class attributes except they represent data objects.

Regards

Uwe

[Former Member]

Hello Uwe,

thanks for answering, but you are right, this solution is not satisfying me

I know that i can access the field directly by name, but in some cases i need to know the name of the actual index of the structure. So i am searching a solutions without big overhead to get this information.

Thanks,

Wolfgang