html - VBA获取在线货币

Question

最近我才发现yahoo finance (.csv) 被关闭了，导致我无法在我的excel 中进行在线货币(更新)。 因此，我尝试使用以下方法来完成我的工作。

1) 网址:http://www.google.com/search?q= “A”+至+“B”/

2) 正如我注意到的那样，货币汇率将显示在 div class="dDoNo vk_bk"

下面是我正在尝试做的工作。

Option Explicit

Function OnlineCurrency(current_country As String, to_country As String) As String
Dim HTTP As MSXML2.XMLHTTP60
Dim URL As String
Dim HTMLDoc As New HTMLDocument
URL = "http://www.google.com/search?q=HKD+to+USD"
Set HTTP = New MSXML2.XMLHTTP60
HTTP.Open "GET", URL, False
HTTP.send
Set HTMLDoc = New HTMLDocument

With HTMLDoc
  .body.innerHTML = HTTP.responseText
  OnlineCurrency = .getElementByClassName("dDoNo vk_bk").innerText
End With

End Function

但似乎我无法证明这一点。有人可以帮助我/为我指出问题吗？谢谢

Answer 1

围绕提供 currency rates for free 提供了许多服务.

如果您的目标是使用 UDF 获取/转换费率，则考虑缓存费率以避免因请求过多而被服务启动。

这是一个 UDF，它使用缓存以 European Central Bank 中的汇率有效地转换货币。 (每日更新):

''
' UDF to convert a currency using the daily updated rates fron the European Central Bank  '
'  =ConvCurrency(1, "USD", "GBP")                                                         '
''
Public Function ConvCurrency(Value, fromSymbol As String, toSymbol As String)
  Static rates As Collection, expiration As Date  ' cached / keeps the value between calls '

  If DateTime.Now > expiration Then
    Dim xhr As Object, node As Object
    expiration = DateTime.Now + DateTime.TimeSerial(1, 0, 0) ' + 1 hour '

    Set rates = New Collection
    rates.Add 1#, "EUR"

    Set xhr = CreateObject("Msxml2.ServerXMLHTTP.6.0")
    xhr.Open "GET", "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml", False
    xhr.Send

    For Each node In xhr.responseXML.SelectNodes("//*[@rate]")
      rates.Add Conversion.Val(node.GetAttribute("rate")), node.GetAttribute("currency")
    Next
  End If

  ConvCurrency = (Value / rates(fromSymbol)) * rates(toSymbol)
End Function

如果您更喜欢中端市场实时汇率，此示例采用来自 www.freeforexapi.com 的汇率

''
' UDF to convert a currency using the mid-market live rates from www.freeforexapi.com     '
'  =ConvCurrency(1, "USD", "GBP")                                                     '
''
Public Function ConvCurrency(Value, fromSymbol As String, toSymbol As String)
  Static rates As Collection, expiration As Date  ' cached / keeps the value between calls '

  Const SYMBOLS = "AED,AFN,ALL,AMD,ANG,AOA,ARS,ATS,AUD,AWG,AZM,AZN,BAM,BBD,BDT,BEF,BGN,BHD,BIF,BMD,BND,BOB,BRL,BSD,BTN,BWP,BYN,BYR,BZD,CAD,CDF,CHF,CLP,CNH,CNY,COP,CRC,CUC,CUP,CVE,CYP,CZK,DEM,DJF,DKK,DOP,DZD,EEK,EGP,ERN,ESP,ETB,EUR,FIM,FJD,FKP,FRF,GBP,GEL,GGP,GHC,GHS,GIP,GMD,GNF,GRD,GTQ,GYD,HKD,HNL,HRK,HTG,HUF,IDR,IEP,ILS,IMP,INR,IQD,IRR,ISK,ITL,JEP,JMD,JOD,JPY,KES,KGS,KHR,KMF,KPW,KRW,KWD,KYD,KZT,LAK,LBP,LKR,LRD,LSL,LTL,LUF,LVL,LYD,MAD,MDL,MGA,MGF,MKD,MMK,MNT,MOP,MRO,MRU,MTL,MUR,MVR,MWK,MXN,MYR,MZM,MZN,NAD,NGN,NIO,NLG,NOK,NPR,NZD,OMR,PAB,PEN,PGK,PHP,PKR,PLN,PTE,PYG,QAR,ROL,RON,RSD,RUB,RWF,SAR,SBD,SCR,SDD,SDG,SEK,SGD,SHP,SIT,SKK,SLL,SOS,SPL,SRD,SRG,STD,STN,SVC,SYP,SZL,THB,TJS,TMM,TMT,TND,TOP,TRL,TRY,TTD,TVD,TWD,TZS,UAH,UGX,USD,UYU,UZS,VAL,VEB,VEF,VES,VND,VUV,WST,XAF,XAG,XAU,XBT,XCD,XDR,XOF,XPD,XPF,XPT,YER,ZAR,ZMK,ZMW,ZWD"

  If DateTime.Now > expiration Then
    Dim xhr As Object, re As Object, match As Object
    expiration = DateTime.Now + DateTime.TimeSerial(0, 1, 0) ' + 1 minute '

    Set rates = New Collection

    Set xhr = CreateObject("Msxml2.ServerXMLHTTP.6.0")
    xhr.Open "GET", "https://www.freeforexapi.com/api/live?pairs=USD" & Replace(SYMBOLS, ",", ",USD"), False
    xhr.Send

    Set re = CreateObject("VBScript.RegExp")
    re.Global = True
    re.Pattern = """USD([A-Z]{3})"".*?""rate"":([\d.]+)"

    For Each match In re.Execute(xhr.responseText)
        rates.Add Conversion.Val(match.SubMatches.Item(1)), match.SubMatches.Item(0)
    Next
  End If

  ConvCurrency = (Value / rates(fromSymbol)) * rates(toSymbol)
End Function