>George, I don't know how to convert the string returned to type that you specified, please help me...
>If is necessary, here is the code of my function...

I know Ed Rauh's stuff pretty well. There should be a function included with his CLSHEAP called DWORDTONUM() or something similar that accepts a string representation of a DWORD and converts it to an integer. If you can't find it, you can using the following

FUNCTION StringToInteger
    
  LPARAMETERS pcstring, plsigned
    
  LOCAL lnresult, lnlast, lni, llsigned,;
    lnmsb, lnmax
  lnresult = 0
  lnlast = LEN(pcstring)
  * Return Signed Integer?
  IF PCOUNT() = 2
    llsigned = plsigned
  ELSE
    llsigned = .F.
  ENDIF
  FOR lni = 1 TO lnlast
    lnresult = lnresult + ASC(SUBSTR(pcstring, lni, 1)) * (256 ^ (lni - 1))
  NEXT
  IF llsigned
    lnmsb = (lnlast * 8) - 1
    IF BITTEST(lnresult, lnmsb)
      lnmax = (2 ^ (lnmsb + 1))
      lnresult = lnresult - lnmax
    ENDIF
  ENDIF
  RETURN lnresult
ENDFUNC

Simply pass it SUBSTR(< stringvar >, 19, 4)(Sergey was correct, BTW.