Header in 'gui_download'

Question

Hi All,
I use 'GUI_DOWNLOAD' to download data from internal table to excel.I am passing the heading in the header field of function module.
call FUNCTION 'GUI_DOWNLOAD'
EXPORTING
      FILENAME                = lv_file
      FILETYPE                = 'ASC'
      write_field_separator   = 'X'
      header                  = lv_header
    TABLES
      data_tab                = t_output.
header is of type XTRING in the function module.
if i declare my variable as type string it shows a runtime dump due to type mismatch.
I am not able to declare it as type xstring.can anyone advice on how to declare a variable as type xstring or any other way to solve my problem.
Thanks & Regards,
Subasree

Answer 1

try this
data:begin of excel_heading,
    text(20) type c,
    end of excel_heading.
    data:it_heading like standard table of excel_heading initial size 0.
*--Generate the heading for excel data
    excel_heading-text = 'A'.
    append excel_heading to it_heading.
    excel_heading-text = 'B'.
    append excel_heading to it_heading.
    excel_heading-text = 'C'.
    append excel_heading to it_heading.
    excel_heading-text = 'D'.
    append excel_heading to it_heading.
    call function 'GUI_DOWNLOAD'
      exporting
        filename              = p_pfile
        filetype              = 'DAT'
        write_field_separator = '#'
        header                = '00'
        trunc_trailing_blanks = 'X'
        show_transfer_status  = 'X'
      tables
        data_tab              = p_it_final[]
        fieldnames            = it_heading[].