GUI_DOWNLOAD - fieldnames does not exist

Question

Hi All,
I have managed to sort out the format of my question, so I have closed the other post and started a fresh
I am wondering if you can help in anyway, I am trying to create a datafile and dump it to a PC, so far I use the cl_gui_frontend_services=>file_save_dialog to allow the user to specify the file location and this does indeed create the file, what I really need are column heading added to the file.
I have search around and it seems that I have to pass FIELDNAMES to cl_gui_frontend_services=>gui_download.
I have created the headers and insterted the field FIELDNAMES but get an error saying :
Formal Parameter FIELDNAMES does not exist.
Also I really need the fieldnames to be created by myself as a couple of the column types are the same and that would confuse the users.
Here is the code I use.
TYPES: BEGIN OF t_fieldnames_structure, " Structure for table of internal fieldnames
            col_text(10) TYPE c,
        END OF t_fieldnames_structure.
        DATA: lw_filename    TYPE string, " For file_save_dialog to store the filename
              lw_path        TYPE string, " For file_save_dialog to store the filepath
              lw_fullpath    TYPE string, " For file_save_dialog to store the full path
              lw_save_result TYPE i,      " For file_save_dialog to store the user input, cancel, save.....
              li_fieldnames  TYPE TABLE OF t_fieldnames_structure, " Internal table for the fieldnames
              lwa_fieldnames LIKE LINE OF li_fieldnames.           " Work area for the fieldnames internal table
         lwa_fieldnames-col_text = 'MATNR'.
         APPEND lwa_fieldnames TO li_fieldnames.
         " Display the file save dialog
         cl_gui_frontend_services=>file_save_dialog(
            EXPORTING
                window_title         = 'Data unload'
                default_extension    = 'TXT'
                default_file_name    = 'GLD-datadump'
                initial_directory    = 'c:\temp\'
            CHANGING
                filename             = lw_filename
                path                 = lw_path
                fullpath             = lw_fullpath
                user_action          = lw_save_result
         IF sy-subrc <> 0.
         ENDIF.
         IF lw_save_result = 0.
         " User wants the data to be saved
             " Write the file to the desired destination
             cl_gui_frontend_services=>gui_download(
                 EXPORTING
                     filename                  = lw_filename
                     filetype                  = 'DAT'
                     write_field_separator     = 'X'
                 CHANGING
                    data_tab                  = i_simulation_structure
                    fieldnames                = li_fieldnames
                 EXCEPTIONS
                     file_write_error          = 1
                     others                    = 24
             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. " User wants the data to be saved
If you have any ideas how I can achieve this it would be great.
Thanking you in advance
Ian

Answer 1

Hi,
i would first download the header then the data with append.
here a short example:
TYPES: BEGIN OF TY_HEAD,
         MATNR(18),
         MTART(04),
       END   OF TY_HEAD.
TYPES: BEGIN OF TY_MARA,
         MATNR LIKE MARA-MATNR,
         MTART LIKE MARA-MTART,
       END   OF TY_MARA.
DATA: IT_MARA TYPE TABLE OF TY_MARA.
DATA: IT_HEAD TYPE TABLE OF TY_HEAD.
DATA: WA_HEAD TYPE          TY_HEAD.
WA_HEAD-MATNR = 'Material'.
WA_HEAD-MTART = 'Mart'.
APPEND WA_HEAD TO IT_HEAD.
SELECT * FROM MARA INTO CORRESPONDING FIELDS OF TABLE IT_MARA UP TO 10 ROWS.
CALL METHOD CL_GUI_FRONTEND_SERVICES=>GUI_DOWNLOAD
  EXPORTING
    FILENAME              = 'C:MATNR.TXT
    FILETYPE              = 'ASC'
    WRITE_FIELD_SEPARATOR = 'X'
  CHANGING
    DATA_TAB              = IT_HEAD[].
CALL METHOD CL_GUI_FRONTEND_SERVICES=>GUI_DOWNLOAD
  EXPORTING
    FILENAME              = 'C:MATNR.TXT
    FILETYPE              = 'ASC'
    APPEND                = 'X'
    WRITE_FIELD_SEPARATOR = 'X'
  CHANGING
    DATA_TAB              = IT_MARA[].
regards, Dieter
Sorry Rajvansh,
i have just see, that you post the idea before.
Regards, Dieter
Edited by: Dieter Gröhn on Jun 7, 2011 11:39 AM