FORM write_wa

FORM write_wa USING wa field newline.
  DATA: str TYPE string ,
        str_idx TYPE string .
  FIELD-SYMBOLS: .
  IF newline = 'X'. WRITE  / ''.ENDIF.
  POSITION 1 .
  DO .
    ASSIGN COMPONENT sy-index OF STRUCTURE wa TO .
    IF sy-subrc <> 0.
      EXIT.
    ELSE.
      str_idx = sy-index .
      CONDENSE str_idx.
      IF field CS str_idx OR field = ''.
        str = .
        WRITE str.
      ENDIF.
    ENDIF.
  ENDDO.
ENDFORM.                    "write_wa

PERFORM write_wa USING itab_out '1 2 3 4 5' 'X'.

 

2008年3月25日改良后的程序：
把决定是否输出的文本改为Mask方式。

REPORT  z_barry_write_wa.

DATA: BEGIN OF itab_out OCCURS 0 ,
        f1 TYPE c,
        f2 TYPE c,
      END OF itab_out.

itab_out-f1 = 'a'.
itab_out-f2 = 'b'.
APPEND itab_out.
itab_out-f1 = 'a'.
itab_out-f2 = 'e'.
APPEND itab_out.

LOOP AT itab_out.
  PERFORM write_wa USING itab_out 'XX' 'X' 'X'.
ENDLOOP.
*---------------------------------------------------------------------*
*       FORM write_wa                                                 *
*---------------------------------------------------------------------*
FORM write_wa USING wa fieldmask newline alllen.
  DATA: str TYPE string ,
        str_idx TYPE string ,
        f_index TYPE i ,
        f_len TYPE i .
  FIELD-SYMBOLS: .
  f_len = strlen( fieldmask ).
  IF newline = 'X'. WRITE  / ''.ENDIF.
  POSITION 1 .
  DO .
    ASSIGN COMPONENT sy-index OF STRUCTURE wa TO .
    IF sy-subrc <> 0 OR sy-index > f_len.
      EXIT.
    ELSE.
      str_idx = sy-index .
      CONDENSE str_idx.
      f_index = sy-index - 1.
      IF fieldmask+f_index(1) = 'X'.
        IF alllen = ''.
          str = .
          WRITE str.
        ELSE.
          WRITE .
        ENDIF.
      ENDIF.
    ENDIF.
  ENDDO.
ENDFORM.                    "write_wa