Use 'convert_otf', but the output table of lines is empty, why?

Question

Hello experts,
I am trying to use the function 'convert_otf' to convert smartforms into pdf. But the output table of lines is empty´.
*   Convert OTF into PDF
CALL FUNCTION 'CONVERT_OTF'
  EXPORTING
    format                = 'PDF'
*    max_linewidth         = 132
  IMPORTING
    bin_filesize          = lv_bytes
    bin_file              = bin_file
  TABLES
    otf                   = gt_otfdata
    lines                 = gt_pdfdata
  EXCEPTIONS
    err_max_linewidth     = 1
    err_format            = 2
    err_conv_not_possible = 3
    OTHERS                = 4.
Before calling this function the parameter value are like following:
LV_BYTES: 0
BIN_FILE:
GT_OTFDATA: Standard Table[15x2(144)
GT_PDFDATA: Standard Table[0x2(268)]
After this function is called, the parameter value are like this:
LV_BYTES: 1774
BIN_FILE:  255044462D312E330D0A2...
GT_OTFDATA: Standard Table[15x2(144)
GT_PDFDATA: Standard Table[0x2(268)]
It looks that there is output for table lines. For download this pdf I have to get a table of pdf data.
What could be the reason for this?
Thank you.
Rujing

Answer 1

See if the below code I did some time back is helpful :
call the FM to return the Smartform function module
  CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME'
    EXPORTING
      formname           = 'ZOL_WATER_PLANT_WEEKLY'
    IMPORTING
      fm_name            = lf_formname
    EXCEPTIONS
      no_form            = 1
      no_function_module = 2
      OTHERS             = 3.
pass data to the smartform
  IF sy-subrc = 0.
    ls_ctrlop-getotf = 'X'.
    ls_ctrlop-no_dialog = 'X'.
    ls_compop-tddest = 'LP01'.
   ls_compop-tdnoprev = 'X'.
    CALL FUNCTION lf_formname
      EXPORTING
        control_parameters = ls_ctrlop
        output_options     = ls_compop
        user_settings      = ' '
        gf_date_fr         = lf_date_fr
        gf_date_to         = lf_date_to
        gf_datum           = lf_datum
      IMPORTING
        job_output_info    = ls_return
      TABLES
        gt_finaldata       = gt_finaldata
        gt_event           = gt_fin_evnt
      EXCEPTIONS
        formatting_error   = 1
        internal_error     = 2
        send_error         = 3
        user_canceled      = 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.
    ELSE.
      LOOP AT ls_return-otfdata INTO wa_otf.
        APPEND wa_otf TO int_otf.
      ENDLOOP.
      CALL FUNCTION 'SX_OBJECT_CONVERT_OTF_PDF'
        EXPORTING
          format_src      = 'OTF'
          format_dst      = 'PDF'
          devtype         = 'PDF1'
        CHANGING
          transfer_bin    = int_bin
          content_txt     = int_otf
          content_bin     = int_pdfx
          objhead         = int_header
          len             = wf_len
        EXCEPTIONS
          err_conv_failed = 1
          OTHERS          = 2.
Mathews