更新 3（2017 年 9 月 24 日）
查看VBA-JSON-parser on GitHub 以获取最新版本和示例。 将JSON.bas模块导入VBA项目进行JSON处理。
更新 2（2016 年 10 月 1 日）
但是，如果您确实想在 64 位 Office 上使用 ScriptControl 解析 JSON，那么 this answer 可能会帮助您让 ScriptControl 在 64 位上工作。
更新（2015 年 10 月 26 日）
请注意，基于ScriptControl 的方法在某些情况下会使系统易受攻击，因为它们允许通过 ActiveX 直接访问恶意 JS 代码的驱动器（和其他东西）。假设您正在解析 Web 服务器响应 JSON，例如 JsonString = "{a:(function(){(new ActiveXObject('Scripting.FileSystemObject')).CreateTextFile('C:\\Test.txt')})()}"。评估后你会发现新创建的文件C:\Test.txt。所以用ScriptControlActiveX 解析 JSON 并不是一个好主意。
为了避免这种情况，我创建了基于 RegEx 的 JSON 解析器。对象{} 由字典表示，这使得使用字典的属性和方法成为可能：.Count、.Exists()、.Item()、.Items、.Keys。数组[] 是传统的从零开始的VB 数组，所以UBound() 显示元素的数量。以下是一些使用示例的代码：
Option Explicit
Sub JsonTest()
Dim strJsonString As String
Dim varJson As Variant
Dim strState As String
Dim varItem As Variant
' parse JSON string to object
' root element can be the object {} or the array []
strJsonString = "{""a"":[{}, 0, ""value"", [{""stuff"":""content""}]], b:null}"
ParseJson strJsonString, varJson, strState
' checking the structure step by step
Select Case False ' if any of the checks is False, the sequence is interrupted
Case IsObject(varJson) ' if root JSON element is object {},
Case varJson.Exists("a") ' having property a,
Case IsArray(varJson("a")) ' which is array,
Case UBound(varJson("a")) >= 3 ' having not less than 4 elements,
Case IsArray(varJson("a")(3)) ' where forth element is array,
Case UBound(varJson("a")(3)) = 0 ' having the only element,
Case IsObject(varJson("a")(3)(0)) ' which is object,
Case varJson("a")(3)(0).Exists("stuff") ' having property stuff,
Case Else
MsgBox "Check the structure step by step" & vbCrLf & varJson("a")(3)(0)("stuff") ' then show the value of the last one property.
End Select
' direct access to the property if sure of structure
MsgBox "Direct access to the property" & vbCrLf & varJson.Item("a")(3)(0).Item("stuff") ' content
' traversing each element in array
For Each varItem In varJson("a")
' show the structure of the element
MsgBox "The structure of the element:" & vbCrLf & BeautifyJson(varItem)
Next
' show the full structure starting from root element
MsgBox "The full structure starting from root element:" & vbCrLf & BeautifyJson(varJson)
End Sub
Sub BeautifyTest()
' put sourse JSON string to "desktop\source.json" file
' processed JSON will be saved to "desktop\result.json" file
Dim strDesktop As String
Dim strJsonString As String
Dim varJson As Variant
Dim strState As String
Dim strResult As String
Dim lngIndent As Long
strDesktop = CreateObject("WScript.Shell").SpecialFolders.Item("Desktop")
strJsonString = ReadTextFile(strDesktop & "\source.json", -2)
ParseJson strJsonString, varJson, strState
If strState <> "Error" Then
strResult = BeautifyJson(varJson)
WriteTextFile strResult, strDesktop & "\result.json", -1
End If
CreateObject("WScript.Shell").PopUp strState, 1, , 64
End Sub
Sub ParseJson(ByVal strContent As String, varJson As Variant, strState As String)
' strContent - source JSON string
' varJson - created object or array to be returned as result
' strState - Object|Array|Error depending on processing to be returned as state
Dim objTokens As Object
Dim objRegEx As Object
Dim bMatched As Boolean
Set objTokens = CreateObject("Scripting.Dictionary")
Set objRegEx = CreateObject("VBScript.RegExp")
With objRegEx
' specification http://www.json.org/
.Global = True
.MultiLine = True
.IgnoreCase = True
.Pattern = """(?:\\""|[^""])*""(?=\s*(?:,|\:|\]|\}))"
Tokenize objTokens, objRegEx, strContent, bMatched, "str"
.Pattern = "(?:[+-])?(?:\d+\.\d*|\.\d+|\d+)e(?:[+-])?\d+(?=\s*(?:,|\]|\}))"
Tokenize objTokens, objRegEx, strContent, bMatched, "num"
.Pattern = "(?:[+-])?(?:\d+\.\d*|\.\d+|\d+)(?=\s*(?:,|\]|\}))"
Tokenize objTokens, objRegEx, strContent, bMatched, "num"
.Pattern = "\b(?:true|false|null)(?=\s*(?:,|\]|\}))"
Tokenize objTokens, objRegEx, strContent, bMatched, "cst"
.Pattern = "\b[A-Za-z_]\w*(?=\s*\:)" ' unspecified name without quotes
Tokenize objTokens, objRegEx, strContent, bMatched, "nam"
.Pattern = "\s"
strContent = .Replace(strContent, "")
.MultiLine = False
Do
bMatched = False
.Pattern = "<\d+(?:str|nam)>\:<\d+(?:str|num|obj|arr|cst)>"
Tokenize objTokens, objRegEx, strContent, bMatched, "prp"
.Pattern = "\{(?:<\d+prp>(?:,<\d+prp>)*)?\}"
Tokenize objTokens, objRegEx, strContent, bMatched, "obj"
.Pattern = "\[(?:<\d+(?:str|num|obj|arr|cst)>(?:,<\d+(?:str|num|obj|arr|cst)>)*)?\]"
Tokenize objTokens, objRegEx, strContent, bMatched, "arr"
Loop While bMatched
.Pattern = "^<\d+(?:obj|arr)>$" ' unspecified top level array
If Not (.Test(strContent) And objTokens.Exists(strContent)) Then
varJson = Null
strState = "Error"
Else
Retrieve objTokens, objRegEx, strContent, varJson
strState = IIf(IsObject(varJson), "Object", "Array")
End If
End With
End Sub
Sub Tokenize(objTokens, objRegEx, strContent, bMatched, strType)
Dim strKey As String
Dim strRes As String
Dim lngCopyIndex As Long
Dim objMatch As Object
strRes = ""
lngCopyIndex = 1
With objRegEx
For Each objMatch In .Execute(strContent)
strKey = "<" & objTokens.Count & strType & ">"
bMatched = True
With objMatch
objTokens(strKey) = .Value
strRes = strRes & Mid(strContent, lngCopyIndex, .FirstIndex - lngCopyIndex + 1) & strKey
lngCopyIndex = .FirstIndex + .Length + 1
End With
Next
strContent = strRes & Mid(strContent, lngCopyIndex, Len(strContent) - lngCopyIndex + 1)
End With
End Sub
Sub Retrieve(objTokens, objRegEx, strTokenKey, varTransfer)
Dim strContent As String
Dim strType As String
Dim objMatches As Object
Dim objMatch As Object
Dim strName As String
Dim varValue As Variant
Dim objArrayElts As Object
strType = Left(Right(strTokenKey, 4), 3)
strContent = objTokens(strTokenKey)
With objRegEx
.Global = True
Select Case strType
Case "obj"
.Pattern = "<\d+\w{3}>"
Set objMatches = .Execute(strContent)
Set varTransfer = CreateObject("Scripting.Dictionary")
For Each objMatch In objMatches
Retrieve objTokens, objRegEx, objMatch.Value, varTransfer
Next
Case "prp"
.Pattern = "<\d+\w{3}>"
Set objMatches = .Execute(strContent)
Retrieve objTokens, objRegEx, objMatches(0).Value, strName
Retrieve objTokens, objRegEx, objMatches(1).Value, varValue
If IsObject(varValue) Then
Set varTransfer(strName) = varValue
Else
varTransfer(strName) = varValue
End If
Case "arr"
.Pattern = "<\d+\w{3}>"
Set objMatches = .Execute(strContent)
Set objArrayElts = CreateObject("Scripting.Dictionary")
For Each objMatch In objMatches
Retrieve objTokens, objRegEx, objMatch.Value, varValue
If IsObject(varValue) Then
Set objArrayElts(objArrayElts.Count) = varValue
Else
objArrayElts(objArrayElts.Count) = varValue
End If
varTransfer = objArrayElts.Items
Next
Case "nam"
varTransfer = strContent
Case "str"
varTransfer = Mid(strContent, 2, Len(strContent) - 2)
varTransfer = Replace(varTransfer, "\""", """")
varTransfer = Replace(varTransfer, "\\", "\")
varTransfer = Replace(varTransfer, "\/", "/")
varTransfer = Replace(varTransfer, "\b", Chr(8))
varTransfer = Replace(varTransfer, "\f", Chr(12))
varTransfer = Replace(varTransfer, "\n", vbLf)
varTransfer = Replace(varTransfer, "\r", vbCr)
varTransfer = Replace(varTransfer, "\t", vbTab)
.Global = False
.Pattern = "\\u[0-9a-fA-F]{4}"
Do While .Test(varTransfer)
varTransfer = .Replace(varTransfer, ChrW(("&H" & Right(.Execute(varTransfer)(0).Value, 4)) * 1))
Loop
Case "num"
varTransfer = Evaluate(strContent)
Case "cst"
Select Case LCase(strContent)
Case "true"
varTransfer = True
Case "false"
varTransfer = False
Case "null"
varTransfer = Null
End Select
End Select
End With
End Sub
Function BeautifyJson(varJson As Variant) As String
Dim strResult As String
Dim lngIndent As Long
BeautifyJson = ""
lngIndent = 0
BeautyTraverse BeautifyJson, lngIndent, varJson, vbTab, 1
End Function
Sub BeautyTraverse(strResult As String, lngIndent As Long, varElement As Variant, strIndent As String, lngStep As Long)
Dim arrKeys() As Variant
Dim lngIndex As Long
Dim strTemp As String
Select Case VarType(varElement)
Case vbObject
If varElement.Count = 0 Then
strResult = strResult & "{}"
Else
strResult = strResult & "{" & vbCrLf
lngIndent = lngIndent + lngStep
arrKeys = varElement.Keys
For lngIndex = 0 To UBound(arrKeys)
strResult = strResult & String(lngIndent, strIndent) & """" & arrKeys(lngIndex) & """" & ": "
BeautyTraverse strResult, lngIndent, varElement(arrKeys(lngIndex)), strIndent, lngStep
If Not (lngIndex = UBound(arrKeys)) Then strResult = strResult & ","
strResult = strResult & vbCrLf
Next
lngIndent = lngIndent - lngStep
strResult = strResult & String(lngIndent, strIndent) & "}"
End If
Case Is >= vbArray
If UBound(varElement) = -1 Then
strResult = strResult & "[]"
Else
strResult = strResult & "[" & vbCrLf
lngIndent = lngIndent + lngStep
For lngIndex = 0 To UBound(varElement)
strResult = strResult & String(lngIndent, strIndent)
BeautyTraverse strResult, lngIndent, varElement(lngIndex), strIndent, lngStep
If Not (lngIndex = UBound(varElement)) Then strResult = strResult & ","
strResult = strResult & vbCrLf
Next
lngIndent = lngIndent - lngStep
strResult = strResult & String(lngIndent, strIndent) & "]"
End If
Case vbInteger, vbLong, vbSingle, vbDouble
strResult = strResult & varElement
Case vbNull
strResult = strResult & "Null"
Case vbBoolean
strResult = strResult & IIf(varElement, "True", "False")
Case Else
strTemp = Replace(varElement, "\""", """")
strTemp = Replace(strTemp, "\", "\\")
strTemp = Replace(strTemp, "/", "\/")
strTemp = Replace(strTemp, Chr(8), "\b")
strTemp = Replace(strTemp, Chr(12), "\f")
strTemp = Replace(strTemp, vbLf, "\n")
strTemp = Replace(strTemp, vbCr, "\r")
strTemp = Replace(strTemp, vbTab, "\t")
strResult = strResult & """" & strTemp & """"
End Select
End Sub
Function ReadTextFile(strPath As String, lngFormat As Long) As String
' lngFormat -2 - System default, -1 - Unicode, 0 - ASCII
With CreateObject("Scripting.FileSystemObject").OpenTextFile(strPath, 1, False, lngFormat)
ReadTextFile = ""
If Not .AtEndOfStream Then ReadTextFile = .ReadAll
.Close
End With
End Function
Sub WriteTextFile(strContent As String, strPath As String, lngFormat As Long)
With CreateObject("Scripting.FileSystemObject").OpenTextFile(strPath, 2, True, lngFormat)
.Write (strContent)
.Close
End With
End Sub
此 JSON RegEx 解析器的另一个机会是它可以在 ScriptControl 不可用的 64 位 Office 上工作。
首字母（2015 年 5 月 27 日）
这是在 VBA 中解析 JSON 的另一种方法，基于 ScriptControl ActiveX，无需外部库：
Sub JsonTest()
Dim Dict, Temp, Text, Keys, Items
' Converting JSON string to appropriate nested dictionaries structure
' Dictionaries have numeric keys for JSON Arrays, and string keys for JSON Objects
' Returns Nothing in case of any JSON syntax issues
Set Dict = GetJsonDict("{a:[[{stuff:'result'}]], b:''}")
' You can use For Each ... Next and For ... Next loops through keys and items
Keys = Dict.Keys
Items = Dict.Items
' Referring directly to the necessary property if sure, without any checks
MsgBox Dict("a")(0)(0)("stuff")
' Auxiliary DrillDown() function
' Drilling down the structure, sequentially checking if each level exists
Select Case False
Case DrillDown(Dict, "a", Temp, "")
Case DrillDown(Temp, 0, Temp, "")
Case DrillDown(Temp, 0, Temp, "")
Case DrillDown(Temp, "stuff", "", Text)
Case Else
' Structure is consistent, requested value found
MsgBox Text
End Select
End Sub
Function GetJsonDict(JsonString As String)
With CreateObject("ScriptControl")
.Language = "JScript"
.ExecuteStatement "function gettype(sample) {return {}.toString.call(sample).slice(8, -1)}"
.ExecuteStatement "function evaljson(json, er) {try {var sample = eval('(' + json + ')'); var type = gettype(sample); if(type != 'Array' && type != 'Object') {return er;} else {return getdict(sample);}} catch(e) {return er;}}"
.ExecuteStatement "function getdict(sample) {var type = gettype(sample); if(type != 'Array' && type != 'Object') return sample; var dict = new ActiveXObject('Scripting.Dictionary'); if(type == 'Array') {for(var key = 0; key < sample.length; key++) {dict.add(key, getdict(sample[key]));}} else {for(var key in sample) {dict.add(key, getdict(sample[key]));}} return dict;}"
Set GetJsonDict = .Run("evaljson", JsonString, Nothing)
End With
End Function
Function DrillDown(Source, Prop, Target, Value)
Select Case False
Case TypeName(Source) = "Dictionary"
Case Source.exists(Prop)
Case Else
Select Case True
Case TypeName(Source(Prop)) = "Dictionary"
Set Target = Source(Prop)
Value = Empty
Case IsObject(Source(Prop))
Set Value = Source(Prop)
Set Target = Nothing
Case Else
Value = Source(Prop)
Set Target = Nothing
End Select
DrillDown = True
Exit Function
End Select
DrillDown = False
End Function