vbs如何获取雅虎汇率？

Function bytes2bstr(vin)
 strreturn = ""
 for i = 1 to lenb(vin)
  thischarcode = ascb(midb(vin,i,1))
  if thischarcode < &h80 then
   strreturn = strreturn & chr(thischarcode)
  else
   nextcharcode = ascb(midb(vin,i+1,1))
   strreturn = strreturn & chr(clng(thischarcode) * &h100 + cint(nextcharcode))
   i = i + 1
  end if
 next
 bytes2bstr = strreturn
End Function
Function GetURL(url)
 Set Retrieval = CreateObject("Microsoft.XMLHTTP")
 With Retrieval
  .Open "GET", url, False
  .Send
  GetURL = bytes2bstr(.responsebody)
  if len(.responsebody)<2 then
   strContent = "远程通讯故障！"
   Call LogToFile(strContent,1)
  response.end
  end if
 End With
 Set Retrieval = Nothing
End Function
'========以上为自定义函数========
 
s1 = INPUTBOX("原始货币代码：","请输入原始货币代码","USD")
s2 = INPUTBOX("目标货币代码：","请输入目标货币代码","CNY")
s = s1&s2
url = "http://download.finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s="&s&"=x"
if s1<>"" and s2<>"" Then
 huilv = GetURL(url)
 MsgBox huilv
End if