Hash Data before downloading file

[sawanee_aimsaard]

Hi Experts,

I want to hast file with algorithm 'SHA1' before I download the file to my PC

(Hash value will be inserted into header line in text file before downloading it).

CALL FUNCTION 'CALCULATE_HASH_FOR_CHAR'
  EXPORTING
    alg                  = 'SHA1'
    data                 = lv_str
*   LENGTH               = 0
  IMPORTING
    hash                 = lv_hash
*   HASHLEN              =
*   HASHX                =
*   HASHXLEN             =
*   HASHSTRING           =
*   HASHXSTRING          =
*   HASHB64STRING        =
 EXCEPTIONS
   unknown_alg          = 1
   param_error          = 2
   internal_error       = 3
   OTHERS               = 4
          .
IF sy-subrc <> 0.
* Implement suitable error handling here
ENDIF.

CALL METHOD cl_gui_frontend_services=>gui_download
  EXPORTING
    filename                  = 'C:\Desktop\TEXT5.txt'
    trunc_trailing_blanks_eol = abap_false
    filetype                  = 'ASC'
  CHANGING
    data_tab                  = lt_data2
  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
    not_supported_by_gui      = 22
    error_no_gui              = 23
    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.

I tried to use function as above('CALCULATE_HASH_FOR_CHAR'). but my file was stored into Standard Table (lt_data2).

Could you please suggest me for using another function to hash text file?

[Sandra_Rossi]

Why don't you just add programatically lv_hash at the start of the first line of lt_data2, just before gui_download ?

[sawanee_aimsaard]

I cannot get hash for for It_data2 because I cannot pass internal table into function CALCULATE_HASH_FOR_CHAR.

[Sandra_Rossi]

So, you are looking for ABAP code to concatenate a table of characters into a string.

If lt_data2 is a "table of string", you may do that:

lv_str = concat_lines_of( lt_data2 ).<br>

If lt_data2 is a table of structured character-like lines, you may do that:

lv_str = REDUCE #( INIT a = `` FOR <b> IN lt_data2 NEXT a = a && <b> ).

[sawanee_aimsaard]

I can solve the problem. Thank you so much