abap读取excel中的数据至内表

CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      filename                = lv_filename
      filetype                = 'ASC'
      has_field_separator     = 'X'
    TABLES
      data_tab                = lt_dummy
    EXCEPTIONS
      file_open_error         = 1
      file_read_error         = 2
      no_batch                = 3
      gui_refuse_filetransfer = 4
      invalid_type            = 5
      no_authority            = 6
      unknown_error           = 7
      bad_data_format         = 8
      header_not_allowed      = 9
      separator_not_allowed   = 10
      header_too_long         = 11
      unknown_dp_error        = 12
      access_denied           = 13
      dp_out_of_memory        = 14
      disk_full               = 15
      dp_timeout              = 16
      OTHERS                  = 17.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    EXIT.
  ENDIF.

  CHECK sy-subrc EQ 0.
CALL FUNCTION 'TEXT_CONVERT_XLS_TO_SAP'
    EXPORTING
      i_field_seperator    = ''
      i_line_header        = ''
      i_tab_raw_data       = lt_dummy
      i_filename           = i_file
    TABLES
      i_tab_converted_data = pt_upload
    EXCEPTIONS
      conversion_failed    = 1
      OTHERS               = 2.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    EXIT.
  ENDIF.