Download data into .csv format ( ABAP webDynpro )

Question

Hi gurus ,
I am new to WebDynpro .
My requirement is that i need to download all my datas into csv format . But when i am using the function module
GUI_DOWNLOAD , an error is coming " Couldnot ascertain code page "
I have used the F.M  ' SAP_CONVERT_TO_CSV_FORMAT '
call function 'SAP_CONVERT_TO_CSV_FORMAT'
exporting
   i_field_seperator          = ';'
  I_LINE_HEADER              =
  I_FILENAME                 = ''
  I_APPL_KEEP                = ' '
  tables
    i_tab_sap_data             = it_fail
changing
   i_tab_converted_data       = csv_converted_table
exceptions
   conversion_failed          = 1
   others                     = 2
when i am using GUI_DOWNLOAD i am getting the above error
CALL FUNCTION 'GUI_DOWNLOAD'
  EXPORTING
filename                        = 'C:\test.csv'
  tables
    data_tab                    = csv_converted_table.
  ENDIF.
suggest me or provide some sample code to download the the csv_converted_table  that i got from the F.M
'SAP_CONVERT_TO_CSV_FORMAT'  into .csv format to my local drive .
Thanx Gurus .

Answer 1

Heyy  Thanks for proving a new concept ..
actually i was using the following code .
DATA : lv_filename TYPE rlgrap-filename,
  lv_timestamp(55) TYPE c,
   lt_csv TYPE truxs_t_text_data,
  ls_csv TYPE LINE OF truxs_t_text_data,
  p_path TYPE string VALUE 'D:\Result'.
Constants : lc_ex TYPE char4 VALUE '.csv'.
CONCATENATE p_path lc_ex INTO lv_timestamp.
lv_filename = lv_timestamp.
CALL FUNCTION 'SAP_CONVERT_TO_TEX_FORMAT'
EXPORTING
i_field_seperator = ','
i_filename = lv_filename
TABLES
i_tab_sap_data = it_fail       
CHANGING
i_tab_converted_data = lt_csv
**-------Place the file in the required directory.
OPEN DATASET lv_filename FOR OUTPUT IN TEXT MODE ENCODING DEFAULT.
LOOP AT lt_csv INTO ls_csv.
TRANSFER ls_csv TO lv_filename.
ENDLOOP.
But i m getting the following error  
File "D:\Result.csv" is not open.
Can u please tell me what needs to be done ...??
Thanks