Alv Report downloading problem

Question

Dear Experts,
                     I'm using one pushbutton for downloading the alv report,  into desktop
1).  but in that file i need header information details also,
2).  then my report contains 26 field but it is downloading upto some fields only,
3).  then when my report contains null values for some columns that columns are not displaying in that file.
share some sample codes,
Thanks and Regards,
Thirukumaran. R

Answer 1

Hi,
1. For header fields, you need to enable one of the field, so that it will recognige the first row as header.
2. You should not consider only the field displayed at output, you should take all the values available in the internal table.
3. First take the record type as STRING. Now CONCATENATE all the fields available in the internal table to this RECORD and append it to some internal table. Now pass this internal table to the GUI_DOWNLOAD function module.
May be you can refer to the below code.
  CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
      filename                  = p_file
      filetype                  = 'ASC'
      append                    = ' '
      write_field_separator     = ' '
      write_lf                  = 'X'
      confirm_overwrite         = 'X'
      ignore_cerr               = 'X'
      replacement               = '#'
      trunc_trailing_blanks_eol = 'X'
      write_lf_after_last_line  = 'X'
      show_transfer_status      = 'X'
    TABLES
      data_tab                  = lt_output_file
    EXCEPTIONS
      file_write_error          = 1
      no_batch                  = 2
      gui_refuse_filetransfer   = 3
      invalid_type              = 4
      no_authority              = 5
      unknown_error             = 6
      header_not_allowed        = 7
      separator_not_allowed     = 8
      filesize_not_allowed      = 9
      header_too_long           = 10
      dp_error_create           = 11
      dp_error_send             = 12
      dp_error_write            = 13
      unknown_dp_error          = 14
      access_denied             = 15
      dp_out_of_memory          = 16
      disk_full                 = 17
      dp_timeout                = 18
      file_not_found            = 19
      dataprovider_exception    = 20
      control_flush_error       = 21
      OTHERS                    = 22.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
            WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
  ENDIF.
Note: May be you need to modify few parameters.....
Regards,
Santhosh.