HRRCF_MDL_CAND_ATT_CREATE - Read file and covert to 'content'

Hi,
We are trying to use FM u2018HRRCF_MDL_CAND_ATT_CREATEu2019 to upload attachment for Candidate (Candidate already in E-Recruiting system). This FM has import parameter u2018CONTENTu2019 (Data Type u2018RAWSTRINGu2019).
I want to know how to read file (File type can be any) from drive and covert into u2018Contentsu2019. Is there any FM to do this?
Regards,
...Naddy

I'm getting type cpmpatiable error.
This is my code,
REPORT  zhr_test_ngo_attachment.
PARAMETERS: p_cand  TYPE  hrobject DEFAULT '01NA50000305'
          , p_head TYPE rcf_attachment_header
          , p_fname         TYPE  string.
DATA:   v_record        TYPE  rcf_s_mdl_cand_attachment,
        v_content       TYPE  rcf_attachment_content,
        v_messages      TYPE  bapirettab,
        v_records       TYPE  rcf_t_mdl_cand_attachment,
        v_size          TYPE  i,
        v_string        TYPE  xstring.
DATA: BEGIN OF xml_tab OCCURS 0,
          raw TYPE x,
       END   OF xml_tab .
v_record-att_type = '0012'.
v_record-language = 'E'.
v_record-att_header = p_head.
*Get file
CALL FUNCTION 'GUI_UPLOAD'
  EXPORTING
    filename            = p_fname
    filetype            = 'BIN'
    has_field_separator = ' '
    header_length       = 0
  IMPORTING
    filelength          = v_size
  TABLES
    data_tab            = xml_tab
  EXCEPTIONS
    OTHERS              = 1.
v_content = xml_tab[].
CALL FUNCTION 'HRRCF_MDL_CAND_ATT_CREATE'
  EXPORTING
    record        = v_record
    cand_hrobject = p_cand
    content       = v_content
    filename      = p_fname
  IMPORTING
    messages      = v_messages.
IF sy-subrc <> 0.
  WRITE 'Attachment Error'.
ENDIF.

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