How to make an openfiledialog? (browse a file and put it in a parameter)

How to make an openfiledialog? (browse a file and put it in a parameter)
Best Regards

hi,
check the code below:
FORM sub_gui_download.
* Define local variables
DATA:
    lo_fullpath       TYPE string,
    lo_filename       TYPE string,
    lo_path           TYPE string,
    lo_user_action    TYPE i,
    lo_encoding       TYPE abap_encoding.
* Define local constants
CONSTANTS:
    lc_encoding(1) TYPE c VALUE 'X',
    lc_directory TYPE string VALUE 'D:',
    lc_filetype TYPE char10 VALUE 'DAT',
    lc_separator TYPE char01 VALUE 'X',
    lc_blank TYPE char01 VALUE ''.
* Call method to create dynamic save_path and save_format
CALL METHOD cl_gui_frontend_services=>file_save_dialog
    EXPORTING
      with_encoding        = lc_encoding
      initial_directory    = lc_directory
    CHANGING
      filename             = lo_filename
      path                 = lo_path
      fullpath             = lo_fullpath
      user_action          = lo_user_action
      file_encoding        = lo_encoding
    EXCEPTIONS
      cntl_error           = 1
      error_no_gui         = 2
      not_supported_by_gui = 3
      OTHERS               = 4.
IF sy-subrc <> 0.
    EXIT.
ENDIF.
* Check user_action
IF lo_user_action <> cl_gui_frontend_services=>action_ok.
    EXIT.
ELSE.
*   If user_action equals to action_ok, call function module to download datas
*   using download table i_dwn_tab
    CALL FUNCTION 'GUI_DOWNLOAD'
      EXPORTING
        filename                = lo_fullpath
        filetype                = lc_filetype
        write_field_separator   = lc_separator
        trunc_trailing_blanks   = lc_blank
      TABLES
        data_tab                = i_dwn_tab
      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 i007.
    ENDIF.
ENDIF.
ENDFORM.

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