ABAP Uploading PDF

parameters:
  p_file type string lower case.
data:
      gs_store_file type z1127582_upload,"z1127582_upload is a table to store PDF file and other relevant data
      gt_content type standard table of tdline,
      len type i,
      xstr_content type xstring.
DATA:
   w_filename TYPE string, " File name
   w_length TYPE i,
   lt_file_table TYPE filetable,
   lv_filelength TYPE i,
   lv_rc TYPE i,
   lv_filename TYPE string,
   w_pdf_data TYPE xstring,
   lt_rawtab TYPE TABLE OF char255,
   w_pdf_file TYPE string,
* Create PDF Object using destination 'ADS' (<-- this is how it is
* defined in SM59)
   lo_pdfobj TYPE REF TO if_fp_pdf_object VALUE IS INITIAL,
   xslt_message TYPE string,
   exc TYPE REF TO cx_root,
   fs_per_info  TYPE ZWD_PER_INFO.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.
  PERFORM f4_help_for_file.
start-of-selection.
  "Upload the file to Internal Table
  call function 'GUI_UPLOAD'
    exporting
      filename                = p_file
      filetype                = 'BIN'
    importing
      filelength              = len
    tables
      data_tab                = gt_content
    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 'Unable to upload file' type 'E'.
  endif.
  "Convert binary ITAB to xstring
  call function 'SCMS_BINARY_TO_XSTRING'
    exporting
      input_length       = len
*     FIRST_LINE         = 0
*     LAST_LINE          = 0
   importing
     buffer             = xstr_content
    tables
      binary_tab         = gt_content
   exceptions
     failed             = 1
     others             = 2
            .
  if sy-subrc <> 0.
    message 'Unable to convert binary to xstring' type 'E'.
  endif.
  clear gs_store_file.
  gs_store_file-filename = p_file.
  gs_store_file-file_content = xstr_content.
  "Insert file into table
  insert z1127582_upload from gs_store_file.
  if sy-subrc is initial.
    message 'Successfully uploaded' type 'S'.
  else.
    message 'Failed to upload' type 'E'.
  endif.
  INCLUDE z1127582_test2_f4_help_for_f01.
FORM f4_help_for_file .
CALL METHOD cl_gui_frontend_services=>file_open_dialog
  CHANGING
  file_table = lt_file_table
  rc = lv_rc
* USER_ACTION =
* FILE_ENCODING =
  EXCEPTIONS
  file_open_dialog_failed = 1
  cntl_error = 2
  error_no_gui = 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.
*  READ TABLE lt_file_table
*        INTO lv_filename
*        INDEX 1.
    READ TABLE lt_file_table
        INTO p_file
        INDEX 1.
    IF sy-subrc EQ 0.
      lv_filename = p_file.
    ENDIF.
  cl_gui_frontend_services=>gui_upload(
    EXPORTING
      filename = lv_filename
      filetype = 'BIN' "Binary
    IMPORTING
      filelength = lv_filelength
    CHANGING
      data_tab = lt_rawtab
    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
      not_supported_by_gui = 17
      error_no_gui = 18
      OTHERS = 19 ).