Sample coding on how to read attachment data

This sample coding is taken from class CL_IM_HRRCF_REQUI_REQUEST,
IF_HRASR00GEN_SERVICE_ADVANCED~FLUSH method. Demonstrated under SAP standard requisition form.

*   PDF as attachment
    SELECT SINGLE parent_scenario FROM t5asrsteps INTO scenario_guid WHERE case_guid = step_guid.
    CALL METHOD cl_hrasr00_pdf_generation=>generate_pdf
      EXPORTING
        scenario_guid   = scenario_guid
        step_guid       = step_guid_process
        message_handler = message_handler
      IMPORTING
        xstring         = xstring.

    CONCATENATE text-a01 '.pdf' INTO lv_request_form.                   "N1600701
    attachment-filename   = lv_request_form.                            "N1600701
    attachment-att_type   = att_type_request.
    attachment-language   = sy-langu.
    attachment-att_header = text-a01.
    attachment-content    = xstring.
    attachment-mimetype   = 'application/pdf'.
    APPEND attachment TO attachments.

*   Attachments of process
    CALL METHOD cl_hrasr00_container_utils=>get_attachments
      EXPORTING
        step_guid   = step_guid_process
      RECEIVING
        attachments = attachment_others.

    IF NOT att_type_others IS INITIAL.
      attachment-att_type   = att_type_others.
      LOOP AT attachment_others  INTO attachment_other.
        attachment-language   = sy-langu.
        attachment-att_header = attachment_other-attachment_type_text.
        attachment-content    = attachment_other-attachment_content.
        attachment-mimetype   = attachment_other-attachment_mimetype.
        attachment-filename   = attachment_other-attachment_filename.   "N1600701
        APPEND attachment TO attachments.
      ENDLOOP.
    ENDIF.