2016.4.26_动态内表【ABAP】

在最后一行加个断点，执行看<FS_DTAB>的值。在选择屏幕输多少，内表生成多少列。

DATA:  DY_TABLE TYPE REF TO DATA, 
       DY_WA TYPE REF TO DATA, 
       IT_STR TYPE LVC_T_FCAT,
       WA_STR TYPE LVC_S_FCAT.

FIELD-SYMBOLS: <FS_DTAB> TYPE STANDARD TABLE,
               <FS_DWA>  TYPE ANY,
               <FS_VALUE> TYPE ANY. 

DATA LV_SEQ TYPE I VALUE 1.
DATA LV_SEQ_C TYPE C LENGTH 2.

PARAMETERS: P_LINE TYPE I DEFAULT 8.

 DO P_LINE TIMES.
    LV_SEQ_C = LV_SEQ.
    CONCATENATE 'C' LV_SEQ_C INTO WA_STR-FIELDNAME.

    WA_STR-COL_POS = LV_SEQ.
    WA_STR-INTTYPE = 'CHAR'.
    WA_STR-INTLEN = 1.
    APPEND WA_STR TO IT_STR.
    CLEAR WA_STR.

    LV_SEQ = LV_SEQ + 1.
  ENDDO.

  CALL METHOD CL_ALV_TABLE_CREATE=>CREATE_DYNAMIC_TABLE
    EXPORTING
      IT_FIELDCATALOG = IT_STR
    IMPORTING
      EP_TABLE        = DY_TABLE. 

  ASSIGN DY_TABLE->* TO <FS_DTAB>.
  CREATE DATA DY_WA LIKE LINE OF <FS_DTAB>.
  ASSIGN DY_WA->* TO <FS_DWA>.