Convert smartform as pdf

Question

Hi,
I am able to run the following program in ABAP editor/se38.
I am not able to run this in ABAP webdynpro.
Plz check and let me know, where the problem is?
I am getting "Access via NULL object reference is not possible".
Especially i am getting an error while creating an object for CL_GUI_FRONTEND_SERVICES? is it need for web dynpro?
(i have given in bold form below)
<u>If possible, plz let me know whereever i should make correction???????</u>
DATA: it_otf   TYPE STANDARD TABLE OF itcoo,
      it_docs  TYPE STANDARD TABLE OF docs,
      it_lines TYPE STANDARD TABLE OF tline,
      st_job_output_info      TYPE ssfcrescl,
      st_document_output_info TYPE ssfcrespd,
      st_job_output_options   TYPE ssfcresop,
      st_output_options       TYPE ssfcompop,
      st_control_parameters   TYPE ssfctrlop,
      v_len_in                TYPE so_obj_len,
      v_language              TYPE sflangu VALUE 'E',
      v_e_devtype             TYPE rspoptype,
      v_bin_filesize          TYPE i,
      v_name                  TYPE string,
      v_path                  TYPE string,
      v_fullpath              TYPE string,
      v_filter                TYPE string,
      v_uact                  TYPE i,
      v_guiobj                TYPE REF TO cl_gui_frontend_services,
      v_filename              TYPE string,
      v_fm_name               TYPE rs38l_fnam.
CONSTANTS c_formname          TYPE tdsfname VALUE 'ZTEST'.
CALL FUNCTION 'SSF_GET_DEVICE_TYPE'
  EXPORTING
    i_language    = v_language
    i_application = 'SAPDEFAULT'
  IMPORTING
    e_devtype     = v_e_devtype.
st_output_options-tdprinter = v_e_devtype.
*st_output_options-tdprinter = 'locl'.
st_control_parameters-no_dialog = 'X'.
st_control_parameters-getotf = 'X'.
.................GET SMARTFORM FUNCTION MODULE NAME.................
CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME'
  EXPORTING
    formname           = c_formname
  IMPORTING
    fm_name            = v_fm_name
  EXCEPTIONS
    no_form            = 1
    no_function_module = 2
    OTHERS             = 3.
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
...........................CALL SMARTFORM............................
CALL FUNCTION v_fm_name
  EXPORTING
    control_parameters   = st_control_parameters
    output_options       = st_output_options
  IMPORTING
    document_output_info = st_document_output_info
    job_output_info      = st_job_output_info
    job_output_options   = st_job_output_options
  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.
.........................CONVERT TO OTF TO PDF.......................
  CALL FUNCTION 'CONVERT_OTF_2_PDF'
    IMPORTING
      bin_filesize           = v_bin_filesize
    TABLES
      otf                    = st_job_output_info-otfdata
      doctab_archive         = it_docs
      lines                  = it_lines
    EXCEPTIONS
      err_conv_not_possible  = 1
      err_otf_mc_noendmarker = 2
      OTHERS                 = 3.
  IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
........................GET THE FILE NAME TO STORE....................
  CONCATENATE 'smrt' '.pdf' INTO v_name.
  <b>CREATE OBJECT v_guiobj.
  CALL METHOD v_guiobj->file_save_dialog</b>    EXPORTING
      default_extension = 'pdf'
      default_file_name = v_name
      file_filter       = v_filter
    CHANGING
      filename          = v_name
      path              = v_path
      fullpath          = v_fullpath
      user_action       = v_uact.
  IF v_uact = v_guiobj->action_cancel.
    EXIT.
  ENDIF.
..................................DOWNLOAD AS FILE....................
  MOVE v_fullpath TO v_filename.
  CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
      bin_filesize            = v_bin_filesize
      filename                = v_filename
      filetype                = 'BIN'
    TABLES
      data_tab                = it_lines
    EXCEPTIONS
      file_write_error        = 1
      no_batch                = 2
      gui_refuse_filetransfer = 3
      invalid_type            = 4
      no_authority            = 5
      unknown_error           = 6
      header_not_allowed      = 7
      separator_not_allowed   = 8
      filesize_not_allowed    = 9
      header_too_long         = 10
      dp_error_create         = 11
      dp_error_send           = 12
      dp_error_write          = 13
      unknown_dp_error        = 14
      access_denied           = 15
      dp_out_of_memory        = 16
      disk_full               = 17
      dp_timeout              = 18
      file_not_found          = 19
      dataprovider_exception  = 20
      control_flush_error     = 21
      OTHERS                  = 22.
  IF sy-subrc <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
ENDIF.

Answer 1

Hello Mog,
Since Web Dynpro runs in a browser based environment without a SAPGUI present, you cannot use CL_GUI_FRONTEND_SERVICES or GUI_DOWNLOAD. The alternate solution is to use CL_WD_RUNTIME_SERVICES=>ATTACH_FILE_TO_RESPONSE.
Best regards,
Thomas