Question

我正在创建的Excel电子表格的一部分是一个包含8个不同位置的网格，它们之间的距离来自Google Maps Distance Matrix API。这些位置是从表格输入的，并会定期更改。

我目前使用的VBA代码是：

   'Calculate Google Maps distance between two addresses
Public Function GetDistance(start As String, dest As String)
    Dim firstVal As String, secondVal As String, lastVal As String
    firstVal = "http://maps.googleapis.com/maps/api/distancematrix/json?origins="
    secondVal = "+UK&destinations="
    lastVal = "+UK&mode=car&language=en&sensor=false"
    Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP")
    URL = firstVal & Replace(start, " ", "+") & secondVal & Replace(dest, " ", "+") & lastVal
    objHTTP.Open "GET", URL, False
    objHTTP.setRequestHeader "User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
    objHTTP.send ("")
    If InStr(objHTTP.responseText, """distance"" : {") = 0 Then GoTo ErrorHandl
    Set regex = CreateObject("VBScript.RegExp"): regex.Pattern = """value"".*?([0-9]+)": regex.Global = False
    Set matches = regex.Execute(objHTTP.responseText)
    tmpVal = Replace(matches(0).SubMatches(0), ".", Application.International(xlListSeparator))
    GetDistance = CDbl(tmpVal)
    Exit Function
ErrorHandl:
    GetDistance = -1
End Function

然后我使用简单的函数在电子表格中调用它：

=GetDistance($D$14,B15)

这个脚本运行良好，但它确实意味着我每次加载电子表格时都会进行56次API调用，每次更改任何位置时，我都会很快达到2500 API调用限制。

有没有办法让函数只在特定时间提取数据（例如，点击按钮），或者只是在较少的API调用中获取相同的数据？

Answer 1

通过添加按钮（仅在按下时刷新）和包含您到目前为止所有值的集合，您应该能够减少调用的数量...

Option Explicit

Public gotRanges As New Collection 'the collection which holds all the data
Public needRef As Range 'the ranges which need to be recalculated
Public refMe As Boolean 'if true GetDistance will update if not in collection

Public Function GetDistance(start As String, dest As String)
  Dim firstVal As String, secondVal As String, lastVal As String, URL As String, tmpVal As String
  Dim runner As Variant, objHTTP, regex, matches
  If gotRanges.Count > 0 Then
    For Each runner In gotRanges
      If runner(0) = start And runner(1) = dest Then
        GetDistance = runner(2)
        Exit Function
      End If
    Next
  End If
  If refMe Then
    firstVal = "http://maps.googleapis.com/maps/api/distancematrix/json?origins="
    secondVal = "+UK&destinations="
    lastVal = "+UK&mode=car&language=en&sensor=false"
    Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP")
    URL = firstVal & Replace(start, " ", "+") & secondVal & Replace(dest, " ", "+") & lastVal
    objHTTP.Open "GET", URL, False
    objHTTP.setRequestHeader "User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
    objHTTP.send ("")
    If InStr(objHTTP.responseText, """distance"" : {") = 0 Then GoTo ErrorHandl
    Set regex = CreateObject("VBScript.RegExp"): regex.Pattern = """value"".*?([0-9]+)": regex.Global = False
    Set matches = regex.Execute(objHTTP.responseText)
    tmpVal = Replace(matches(0).SubMatches(0), ".", Application.International(xlListSeparator))
    GetDistance = CDbl(tmpVal)
    gotRanges.Add Array(start, dest, GetDistance)
    Exit Function
  Else
    If needRef Is Nothing Then
      Set needRef = Application.Caller
    Else
      Set needRef = Union(needRef, Application.Caller)
    End If
  End If
ErrorHandl:
  GetDistance = -1
End Function

Public Sub theButtonSub() 'call this to update the actual settings
  Dim runner As Variant
  refMe = True
  If Not needRef Is Nothing Then
    For Each runner In needRef
      runner.Offset.Formula = runner.Formula
    Next
  End If
  Set needRef = Nothing
  refMe = False
End Sub

如果你将a，b和c（可以加载6次）加载到c，a和b（如果你理解我的意思......）将不再加载

如果您仍有疑问，请询问：）

使用Excel上的Google Maps Distance Matrix API，减少API调用次数

1 个答案: