Using FM SO_OBJECT_DOWNLOAD

Question

Hi all,
I am having problem in using this FM. I want to download any file to my local desktop from the file attachment list of an employee in PA20/PA30. I kept on getting Access via 'NULL' object reference not possible error message.
This is how I use it. The filename is obtained through the a pop up box asking user to input a file name with a file path.
CALL FUNCTION 'SO_OBJECT_DOWNLOAD'
   EXPORTING
  BIN_FILESIZE           = 0
  DEFAULT_FILENAME       = ' '
     filetype               = 'BIN'
     path_and_file          = lo_stru_output_param-file_name  "C:\Users\sc\Desktop\xyz.pdf
  EXTCT                  = ' '
     no_dialog              = ' '
  CODEPAGE               =
IMPORTING
  FILELENGTH             =
  F_CANCELLED            =
  ACT_FILETYPE           =
  ACT_FILENAME           =
    TABLES
      objcont                = lt_object_cont
   EXCEPTIONS
     file_write_error       = 1
     invalid_type           = 2
     x_error                = 3
     kpro_error             = 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.

Answer 1

Use this:
DATA lr_conv   TYPE REF TO cl_abap_conv_out_ce.
  DATA lv_data   TYPE        string.
  DATA lv_xfile  TYPE        xstring.
  lv_data = 'Example text, which will be opened in MS Word.'.
  cl_abap_conv_out_ce=>create( RECEIVING conv = lr_conv ).
  lr_conv->convert( EXPORTING data   = lv_data
                    IMPORTING buffer = lv_xfile ).
  cl_wd_runtime_services=>attach_file_to_response(
                     EXPORTING i_filename  = 'wd4a.doc'
                               i_content   = lv_xfile
                               i_mime_type = 'application/msword' ).