CL_GUI_FRONTEND_SERVICES=>FILE_EXIST（判断物理文件是否存在）

CALL METHOD CL_GUI_FRONTEND_SERVICES=>FILE_EXIST
  EXPORTING
    FILE                 = l_file
  RECEIVING
    RESULT               = l_rt
  EXCEPTIONS
    CNTL_ERROR           = 1
    ERROR_NO_GUI         = 2
    WRONG_PARAMETER      = 3
    NOT_SUPPORTED_BY_GUI = 4
    others               = 5
        .
IF SY-SUBRC <> 0.
 MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.

IF l_rt is initial.
 MESSAGE E000(ZMM) WITH text-e02.
*   &1 &2 &3 &4

ENDIF.