Dynamic programming using cl_abap_typedescr

Question

I have created a field catalog for an ALV grid dynamically using cl_alv_table_create=>create_dynamic_table (I am on 46B and cannot use the new version).  How do I create the structure and therefore internal table to pass into the it_outtab parameter of the ALV grid set_table_for_first_display
method?  I can create a blank table with the correct dynamic columns but now wish to populate it without much success!  I am retrieving the type using cl_abap_typedescr=>describe_by_data and can cycle through the key but how do I just obtain the structure?
Cheers
Ian
cl_abap_typedescr to retrieve the column names of a dynamic table I have created for using with an ALV grid

Answer 1

Hi,
Use ASSIGN r_dyn_table->* TO <t_dyn_table> to get access to the dynamic table. To append rows to it, you should use ASSIGN COMPONENT idx/name OF STRUCTURE struc TO <fs>.
Example:
    data: tab_fields like table of wa_fields,
         r_dyn_table  TYPE REF TO data,
         r_wa_dyn_table   TYPE REF TO data,
         f_int type i.
CALL METHOD cl_alv_table_create=>create_dynamic_table
      EXPORTING
        it_fieldcatalog           = F_TAB_FCAT
      IMPORTING
        ep_table                  = r_dyn_table
      EXCEPTIONS
        generate_subpool_dir_full = 1
        OTHERS                    = 2.
      ASSIGN r_dyn_table->* TO <t_dyn_table>.
      CREATE DATA r_wa_dyn_table LIKE LINE OF <t_dyn_table>.
      ASSIGN r_wa_dyn_table->* TO <wa_dyn_table>.
      DESCRIBE TABLE tab_fields lines f_int.
      do f_int times.
        READ TABLE tab_fields INDEX sy-index into wa_fields.
        ASSIGN wa_fields-field TO <w_field1>.
        check1 = sy-subrc.
        ASSIGN COMPONENT sy-index
               OF STRUCTURE <wa_dyn_table> TO <w_field2>.
        check2 = sy-subrc.
        if check1 = 0 and check2 = 0.
          <w_field2> = <w_field1>.
        endif.
      enddo.
Svetlin