以字节为单位计算itab结构的长度

Question

The internal table size (eg for a DSO) is limited to 4030 bytes. I have a list of infoobjects and would like to calculate if their amount will exceed this limit. How can I convert their data type in bytes?

Example:

CHAR 4 -> xxx bytes
DATS   -> xxx bytes
FLTP   -> xxx bytes
...

Thanks a lot!

Answer 1

You have to replace the ls_bkpf with the actual structure (line of internal table) you use in your program, oherwise I hope it helps. lv_length will contain the total size of the fields in bytes.

  DATA: ls_bkpf TYPE bkpf.
  FIELD-SYMBOLS: <lv_field> TYPE any.
  DATA: lo_typedesc TYPE REF TO cl_abap_typedescr.
  DATA: lv_length TYPE i.

  DO.
    ASSIGN COMPONENT sy-index
           OF STRUCTURE ls_bkpf
           TO <lv_field>.
    IF sy-subrc EQ 0.
      lo_typedesc = cl_abap_elemdescr=>describe_by_data( <lv_field> ).
      ADD lo_typedesc->length TO lv_length.
    ELSE.
      EXIT.
    ENDIF.
  ENDDO.