尽管有值,Excel VBA单元格返回“0”

时间:2014-05-14 15:20:20

标签: excel vba excel-vba google-api excel-udf

我正在处理一项任务,我需要使用Google的oAuth 2.0集成从Excel获取Google AnalyticsAPI的访问令牌。

初始请求通过传入存储在我的工作表中的单元格中的客户端ID,密钥和身份验证令牌来工作。

我使用的UDF看起来像这样:

Public Function GetGAAuthenticationToken _
                    (ByVal ClientId As String,  _
                    ByVal ClientSecret As String,  _
                    ByVal code As String,  _
                    accessToken As String,  _
                    RefreshToken As String,  _
                    accessTokenExpires As Date)

  'Has token expire? If not, don't renew the access token.
  Dim Token(2, 0)
  Dim Refresh As Boolean: Refresh = True

  If Now < accessTokenExpires Then
    Token(0, 0) = accessToken
    Token(1, 0) = RefreshToken
    Token(2, 0) = accessTokenExpires
    Refresh = False
  End If

  Dim objhttp As Object
  Dim ResponseText As String

  If Refresh Then
      If RefreshToken = "" Or RefreshToken = "0" Then
        'Initial authorization code=GetGAAuthenticationToken(B1, B2, B4, B6, B7, B8)
        Set objhttp = CreateObject("MSXML2.ServerXMLHTTP.6.0")
        URL = "https://accounts.google.com/o/oauth2/token"
        objhttp.Open "POST", URL, False
        objhttp.setRequestHeader "Content-type", "application/x-www-form-urlencoded"
        objhttp.setTimeouts 1000000, 1000000, 1000000, 1000000
        objhttp.send ("code=" & code & "&client_id=" & ClientId & "&client_secret=" _
          & ClientSecret _
          & "&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2%2E0%3Aoob&grant_type=authorization_code")

        ResponseText = objhttp.ResponseText
      Else
        'Refresh Token
        Set objhttp = CreateObject("MSXML2.ServerXMLHTTP.6.0")
        URL = "https://accounts.google.com/o/oauth2/token"
        objhttp.Open "POST", URL, False
        objhttp.setRequestHeader "Content-type", "application/x-www-form-urlencoded"
        objhttp.setTimeouts 1000000, 1000000, 1000000, 1000000
        objhttp.send  _
          ("client_id=" & ClientId  _
           & "&client_secret=" & ClientSecret & "&refresh_token=" _
           & RefreshToken & "&grant_type=refresh_token")

        ResponseText = objhttp.ResponseText
      End If

      Dim XMLResponse:    Set XMLResponse = JSONtoXML(ResponseText)
      Dim XMLResult:    Set XMLResult = XMLResponse.SelectSingleNode("//XML")

      If Not IsNull(XMLResult.GetAttribute("access_token")) Then
        Token(0, 0) = XMLResult.GetAttribute("access_token")
      End If
      If Not IsNull(XMLResult.GetAttribute("refresh_token")) Then
        Token(1, 0) = XMLResult.GetAttribute("refresh_token")
      Else
        Token(2, 0) = RefreshToken
      End If
      If Not IsNull(XMLResult.GetAttribute("expires_in")) Then
        If IsNumeric(XMLResult.GetAttribute("expires_in")) Then
           Token(2, 0) = DateAdd("s", CInt(XMLResult.GetAttribute("expires_in")), Now)
        Else
            Token(2, 0) = DateAdd("s", 3600, Now)
        End If
      Else
        Token(2, 0) = DateAdd("s", 3600, Now)
      End If
  End If

  GetGAAuthenticationToken = Token

End Function

在我的工作表中,我有一组调用该函数的单元格:

=GetGAAuthenticationToken(B1, B2, B4, B5, B6, B7)

如上所述,初始请求正常,并将访问令牌,刷新令牌和访问令牌到期日期输出到单元格B5,B6和B7中。

但是,当我再次运行请求时,我希望将B5,B6和B7的值传递给我的UDF,它们会以&#34; 0&#34;来表示。看起来它们在触发更新和UDF执行之间被重置。是否有可能获得这些价值?

我遇到过此页面http://fastexcel.wordpress.com/2012/01/08/writing-efficient-vba-udfs-part-8-getting-the-previously-calculated-value-from-the-calling-cells/,这似乎与我尝试做的类似,但这似乎是针对单个字段而不是数组?

我对Excel和VBA没有任何经验,所以欢迎任何帮助。

谢谢!

2 个答案:

答案 0 :(得分:1)

更改函数以获取Range参数,而不是字符串/日期参数。引用“B1”的UDF传递Range对象。

Public Function GetGAAuthenticationToken(ByVal p_ClientId As Range, ByVal p_ClientSecret As Range, ByVal p_code As Range, p_accessToken As Range, _
p_RefreshToken As Range, p_accessTokenExpires As Range)

然后声明您的变量并将它们设置为范围对象的值:

Dim ClientId As String
Dim ClientSecret As String
Dim code As String
Dim accessToken As String
Dim RefreshToken As String
Dim accessTokenExpires As Date

ClientId = p_ClientId.value
ClientSecret = p_ClientSecret.value
code = p_code.value
accessToken = p_accessToken.value
RefreshToken = p_RefreshToken.value
accessTokenExpires = p_accessTokenExpires.value

注意我更改了参数的命名,因此您无需修改​​变量名称。如果你愿意,你当然可以改变它。

答案 1 :(得分:0)

尚未真正检查过您的代码,但某处可能存在数据类型问题。尝试将传入值从“As String”更改为“As Range”,并使用调试器查看函数内的值(例如accessToken.Value)。

根据我的经验,将除UD之外的东西输入UDF是绝对不安全的,因为Excel可以在单元格中存储各种数据类型。最好从函数内部的范围引用中获取值。我很难学到这一点......

祝你好运!