How to get the complete data from Webdynpro using a RFC

Question

hi guys,
A form is created in the webdynpro, when that pdf form is called the user have to provide the key field ie the employee number in the form and then when he press the 'go' button a rfc is called and it gives all the details of the employee in the form. Then the user have to input some fields in the form and he have press the submit button. My problem is here, when the user is going to press the submit button that form will be converted to a stream (binary) of data and it is sent to one of the import parameter used in the RFC.
I have created a RFC and created a import parameter of data type XSTRING, since i want to see what exactly R3 is receiving from web dynpro i am writing this contant in the sever as a text file. When i saw that text file i cant see the complete data.
And when i searched in R3 the capacity of xstring is 1024 CHAR, so i dont know how to capture the entire data from webdynpro into my R3.
I give the code what i worte please tell me am i missing anything in my code, or is there any data type which can hold more than 500kb of data which is coming from webdynpro.
FUNCTION ZSEND_MAIL_ATTACHMENT.
""Local Interface:
*"  IMPORTING
*"     VALUE(OUT_PLACE_LEVEL) TYPE  XSTRING OPTIONAL
*"     VALUE(BIN_DATA) TYPE  INDX_CLUST OPTIONAL
*"  TABLES
*"      IT_MESSAGE STRUCTURE  SOLISTI1
Data Declaration
  DATA: gd_cnt TYPE i,
      gd_sent_all(1) TYPE c,
      gd_error TYPE sy-subrc,
      tab_lines LIKE sy-tabix.
Structure Declaration
  DATA : BEGIN OF it_file OCCURS 0,
          row(255),
         END OF it_file.
  DATA : BEGIN OF i_split OCCURS 0,
  row(50),
  END OF i_split.
Internal Table Declaration
  data : it_receivers like table of SOMLRECI1 with header line."occurs 0.
  DATA : objbin LIKE SOLISTI1 OCCURS 0 WITH HEADER LINE. "sOLIX
  DATA : it_packing_list LIKE sopcklsti1 OCCURS 0 WITH HEADER LINE.
  data : wa_receiver like table of SOMLRECI1 with header line.
  data : it_receiver like table of SOMLRECI1 with header line.
  data : v_bin_data like SOLISTI1 occurs 0 with header line.
  DATA : gd_doc_data LIKE sodocchgi1 OCCURS 0 WITH HEADER LINE.
*data bin_data1 like table of solix with header line.
  REFRESH : objbin, it_packing_list, it_receivers, wa_receiver.
  CLEAR   : objbin, it_packing_list, wa_receiver, it_receivers.
  DATA V_SUBJECT(255) VALUE 'HI'.
  gd_doc_data-doc_size = ( tab_lines - 1 ) * 255 + STRLEN( it_message ).
  gd_doc_data-obj_langu = sy-langu.
  gd_doc_data-obj_name = 'SENDFILE'.
  gd_doc_data-obj_descr = v_subject.
  gd_doc_data-sensitivty = 'O'.
  APPEND GD_DOC_DATA.
Appending The Internal Table it_packing_list
  it_packing_list-head_start = 1.
  it_packing_list-head_num = 0.
  it_packing_list-body_start = 1.
  it_packing_list-doc_type = 'RAW'.
  it_packing_list-body_num = tab_lines.
  APPEND it_packing_list.
*CALL FUNCTION 'GUI_UPLOAD'
*EXPORTING
*filename = V_FILE_PATH
*filetype = 'BIN'
*TABLES
*data_tab = BIN_DATA.
  move bin_data to v_bin_data.
  append v_bin_data.
*move soli to bin_data.
  LOOP AT V_BIN_DATA into objbin.
MOVE v_bin_data TO objbin-line.
    APPEND objbin.
  ENDLOOP.
  CLEAR it_packing_list.
  DESCRIBE TABLE objbin LINES tab_lines.
  it_packing_list-transf_bin = 'X'.
  it_packing_list-head_start = 1.
  it_packing_list-head_num = 1.
  it_packing_list-body_start = 1.
  it_packing_list-doc_type = 'PDF'.
  it_packing_list-body_num = tab_lines.
  it_packing_list-doc_size = tab_lines * 255.
  APPEND it_packing_list.
data file(255) value '/tmp/bali.txt'.
*Appending The Internal Table it_receivers
close dataset '/tmp/bali.txt'.
open dataset '/tmp/bali.txt' for output in text mode encoding default.
if sy-subrc = 0.
loop at objbin.
transfer objbin to '/tmp/bali.txt'.
endloop.
else.
write 'hi'.
close dataset '/tmp/bali.txt'.
endif.
  it_receiver-receiver = '[email protected]'.
  it_receiver-rec_type = 'U'.
  it_receiver-com_type = 'INT'.
APPEND wa_receiver.
move wa_receiver[] to it_receiver[].
  append it_receiver.
*Move wa_receiver[] to it_receivers[].
Clear it_receivers.
if i_OUT_PLACE_LEVEL NE 0.
loop at it_receivers into wa_receiver.
   loop at it_receivers into wa_receiver.
**Function Module To Post The Message To Externa Mail
     CALL FUNCTION 'SO_NEW_DOCUMENT_ATT_SEND_API1'
       EXPORTING
         document_data              = gd_doc_data
         put_in_outbox              = 'X'
         commit_work                = 'X'
       TABLES
         packing_list               = it_packing_list
         CONTENTS_TXT               = objbin
         receivers                  = it_receivers
       EXCEPTIONS
         too_many_receivers         = 1
         document_not_sent          = 2
         document_type_not_exist    = 3
         operation_no_authorization = 4
         parameter_error            = 5
         x_error                    = 6
         enqueue_error              = 7
         OTHERS                     = 8.
     clear wa_receiver.
ENDFUNCTION.

Answer 1

You have to convert your long string to a table of shorter strings.
There may be other ways, but one possibility is to use a loop to process you string.
while (there is something left)
   put the next e.g. 1024 characters in a new row of your table
endwhile
If you need to reconstruct your string from the table, don't use simple concatenation since it will remove blanks at the end of lines. Believe me (from experience) sooner or later this will happen.
Instead you need to either set the subsections of your long string, or insert from the end of your table and keep shifting the contents (probably less efficient) right