在Excel VBA代码中处理XMLHttp响应中的JSON对象

Question

我需要处理一个JSON对象,它是Excel VBA中XMLHTTPRequest的响应.我写了下面的代码,但它不起作用:

  Dim sc As Object
  Set sc = CreateObject("ScriptControl")
  sc.Language = "JScript"

  Dim strURL As String: strURL = "blah blah"

  Dim strRequest
  Dim XMLhttp: Set XMLhttp = CreateObject("msxml2.xmlhttp")
  Dim response As String

  XMLhttp.Open "POST", strURL, False
  XMLhttp.setrequestheader "Content-Type", "application/x-www-form-urlencoded"
  XMLhttp.send strRequest
  response = XMLhttp.responseText
  sc.Eval ("JSON.parse('" + response + "')")

我收到错误运行时错误'429'ActiveX组件无法在行中 创建对象Set sc = CreateObject("ScriptControl")

解析JSON对象后,如何访问JSON对象的值？

PS My JSON对象示例: {"Success":true,"Message":"Blah blah"}

Answer 1

代码从nseindia站点获取数据,该数据作为responseDiv元素中的JSON字符串.

必需的参考文献

我用过的3类模块

• cJSONScript
• cStringBuilder
• JSON

(我从这里选择了这些课程模块)

您可以从此链接下载该文件

标准模块

Const URl As String = "http://www.nseindia.com/live_market/dynaContent/live_watch/get_quote/GetQuote.jsp?symbol=ICICIBANK"
Sub xmlHttp()

    Dim xmlHttp As Object
    Set xmlHttp = CreateObject("MSXML2.ServerXMLHTTP.6.0")
    xmlHttp.Open "GET", URl & "&rnd=" & WorksheetFunction.RandBetween(1, 99), False
    xmlHttp.setRequestHeader "Content-Type", "text/xml"
    xmlHttp.send

    Dim html As MSHTML.HTMLDocument
    Set html = New MSHTML.HTMLDocument
    html.body.innerHTML = xmlHttp.ResponseText

    Dim divData As Object
    Set divData = html.getElementById("responseDiv")
    '?divData.innerHTML
    ' Here you will get a string which is a JSON data

    Dim strDiv As String, startVal As Long, endVal As Long
    strDiv = divData.innerHTML
    startVal = InStr(1, strDiv, "data", vbTextCompare)
    endVal = InStr(startVal, strDiv, "]", vbTextCompare)
    strDiv = "{" & Mid(strDiv, startVal - 1, (endVal - startVal) + 2) & "}"


    Dim JSON As New JSON

    Dim p As Object
    Set p = JSON.parse(strDiv)

    i = 1
    For Each item In p("data")(1)
       Cells(i, 1) = item
       Cells(i, 2) = p("data")(1)(item)
        i = i + 1
    Next

 End Sub

Answer 2

我在以下库中获得了很多成功:

https://github.com/VBA-tools/VBA-JSON

该库Scripting.Dictionary用于Objects和Collectionfor Arrays,我对解析相当复杂的json文件没有任何问题.

至于自己解析json的更多信息,请查看此问题,了解有关sc.Eval调用返回的JScriptTypeInfo对象问题的一些背景信息:

Excel VBA:解析的JSON对象循环

最后,对于一些有用的类XMLHTTPRequest,我的项目的一个小插件,VBA-Web:

https://github.com/VBA-tools/VBA-Web