标题: 用VBS解析JSON格式数据之VbsJson类
作者: Demon
链接: https://demon.tw/my-work/vbs-json.html
版权: 本博客的所有文章，都遵守“署名-非商业性使用-相同方式共享 2.5 中国大陆”协议条款。
曾经写过一篇《用VBS解析JSON格式数据》，里面提到了用 VBS 解析 JSON 的三种方法：：第一，根据算法自己写一个解析 JSON 的库；第二，使用正则表达式匹配需要的数据；第三，用 JavaScript 来解析。
文章中使用的是第三种方法，即通过 MSScriptControl.ScriptControl 组件来调用 JavaScript 来解析。“乱码”根据那篇文章写了《VBS脚本之JSON数据解析》，稍稍改进了我的方法；不过他最近发现这个组件兼容性不太好，并写了一篇《VBS脚本之JSON数据解析(二)》，里面是用正则表达式来解析 JSON 的；之后又写了一篇《VBS脚本之JSON数据解析(三)[终章]》，里面用 htmlfile 来代替 MSScriptControl.ScriptControl，增强了可移植性：
Function ParseJson(strJson) Set html = CreateObject("htmlfile") Set window = html.parentWindow window.execScript "var json = " & strJson, "JScript" Set ParseJson = window.json End Function
不得不说这个方法很巧妙，但是却不能遍历数组和对象，作为“终章”似乎还差了一点，本文就是作为终章的存在：用 Native VBScript 来解析 JSON —— VbsJson类。该类提供了两个公有方法：Encode 和 Decode，分别用来生成和解析 JSON 数据。
VbsJson.vbs
Class VbsJson 'Author: Demon 'Date: 2012/5/3 'Website: https://demon.tw Private Whitespace, NumberRegex, StringChunk Private b, f, r, n, t Private Sub Class_Initialize Whitespace = " " & vbTab & vbCr & vbLf b = ChrW(8) f = vbFormFeed r = vbCr n = vbLf t = vbTab Set NumberRegex = New RegExp NumberRegex.Pattern = "(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?" NumberRegex.Global = False NumberRegex.MultiLine = True NumberRegex.IgnoreCase = True Set StringChunk = New RegExp StringChunk.Pattern = "([\s\S]*?)([""\\\x00-\x1f])" StringChunk.Global = False StringChunk.MultiLine = True StringChunk.IgnoreCase = True End Sub 'Return a JSON string representation of a VBScript data structure 'Supports the following objects and types '+-------------------+---------------+ '| VBScript | JSON | '+===================+===============+ '| Dictionary | object | '+-------------------+---------------+ '| Array | array | '+-------------------+---------------+ '| String | string | '+-------------------+---------------+ '| Number | number | '+-------------------+---------------+ '| True | true | '+-------------------+---------------+ '| False | false | '+-------------------+---------------+ '| Null | null | '+-------------------+---------------+ Public Function Encode(ByRef obj) Dim buf, i, c, g Set buf = CreateObject("Scripting.Dictionary") Select Case VarType(obj) Case vbNull buf.Add buf.Count, "null" Case vbBoolean If obj Then buf.Add buf.Count, "true" Else buf.Add buf.Count, "false" End If Case vbInteger, vbLong, vbSingle, vbDouble buf.Add buf.Count, obj Case vbString buf.Add buf.Count, """" For i = 1 To Len(obj) c = Mid(obj, i, 1) Select Case c Case """" buf.Add buf.Count, "\""" Case "\" buf.Add buf.Count, "\\" Case "/" buf.Add buf.Count, "/" Case b buf.Add buf.Count, "\b" Case f buf.Add buf.Count, "\f" Case r buf.Add buf.Count, "\r" Case n buf.Add buf.Count, "\n" Case t buf.Add buf.Count, "\t" Case Else If AscW(c) >= 0 And AscW(c) <= 31 Then c = Right("0" & Hex(AscW(c)), 2) buf.Add buf.Count, "\u00" & c Else buf.Add buf.Count, c End If End Select Next buf.Add buf.Count, """" Case vbArray + vbVariant g = True buf.Add buf.Count, "[" For Each i In obj If g Then g = False Else buf.Add buf.Count, "," buf.Add buf.Count, Encode(i) Next buf.Add buf.Count, "]" Case vbObject If TypeName(obj) = "Dictionary" Then g = True buf.Add buf.Count, "{" For Each i In obj If g Then g = False Else buf.Add buf.Count, "," buf.Add buf.Count, """" & i & """" & ":" & Encode(obj(i)) Next buf.Add buf.Count, "}" Else Err.Raise 8732,,"None dictionary object" End If Case Else buf.Add buf.Count, """" & CStr(obj) & """" End Select Encode = Join(buf.Items, "") End Function 'Return the VBScript representation of ``str(`` 'Performs the following translations in decoding '+---------------+-------------------+ '| JSON | VBScript | '+===============+===================+ '| object | Dictionary | '+---------------+-------------------+ '| array | Array | '+---------------+-------------------+ '| string | String | '+---------------+-------------------+ '| number | Double | '+---------------+-------------------+ '| true | True | '+---------------+-------------------+ '| false | False | '+---------------+-------------------+ '| null | Null | '+---------------+-------------------+ Public Function Decode(ByRef str) Dim idx idx = SkipWhitespace(str, 1) If Mid(str, idx, 1) = "{" Then Set Decode = ScanOnce(str, 1) Else Decode = ScanOnce(str, 1) End If End Function Private Function ScanOnce(ByRef str, ByRef idx) Dim c, ms idx = SkipWhitespace(str, idx) c = Mid(str, idx, 1) If c = "{" Then idx = idx + 1 Set ScanOnce = ParseObject(str, idx) Exit Function ElseIf c = "[" Then idx = idx + 1 ScanOnce = ParseArray(str, idx) Exit Function ElseIf c = """" Then idx = idx + 1 ScanOnce = ParseString(str, idx) Exit Function ElseIf c = "n" And StrComp("null", Mid(str, idx, 4)) = 0 Then idx = idx + 4 ScanOnce = Null Exit Function ElseIf c = "t" And StrComp("true", Mid(str, idx, 4)) = 0 Then idx = idx + 4 ScanOnce = True Exit Function ElseIf c = "f" And StrComp("false", Mid(str, idx, 5)) = 0 Then idx = idx + 5 ScanOnce = False Exit Function End If Set ms = NumberRegex.Execute(Mid(str, idx)) If ms.Count = 1 Then idx = idx + ms(0).Length ScanOnce = CDbl(ms(0)) Exit Function End If Err.Raise 8732,,"No JSON object could be ScanOnced" End Function Private Function ParseObject(ByRef str, ByRef idx) Dim c, key, value Set ParseObject = CreateObject("Scripting.Dictionary") idx = SkipWhitespace(str, idx) c = Mid(str, idx, 1) If c = "}" Then Exit Function ElseIf c <> """" Then Err.Raise 8732,,"Expecting property name" End If idx = idx + 1 Do key = ParseString(str, idx) idx = SkipWhitespace(str, idx) If Mid(str, idx, 1) <> ":" Then Err.Raise 8732,,"Expecting : delimiter" End If idx = SkipWhitespace(str, idx + 1) If Mid(str, idx, 1) = "{" Then Set value = ScanOnce(str, idx) Else value = ScanOnce(str, idx) End If ParseObject.Add key, value idx = SkipWhitespace(str, idx) c = Mid(str, idx, 1) If c = "}" Then Exit Do ElseIf c <> "," Then Err.Raise 8732,,"Expecting , delimiter" End If idx = SkipWhitespace(str, idx + 1) c = Mid(str, idx, 1) If c <> """" Then Err.Raise 8732,,"Expecting property name" End If idx = idx + 1 Loop idx = idx + 1 End Function Private Function ParseArray(ByRef str, ByRef idx) Dim c, values, value Set values = CreateObject("Scripting.Dictionary") idx = SkipWhitespace(str, idx) c = Mid(str, idx, 1) If c = "]" Then ParseArray = values.Items Exit Function End If Do idx = SkipWhitespace(str, idx) If Mid(str, idx, 1) = "{" Then Set value = ScanOnce(str, idx) Else value = ScanOnce(str, idx) End If values.Add values.Count, value idx = SkipWhitespace(str, idx) c = Mid(str, idx, 1) If c = "]" Then Exit Do ElseIf c <> "," Then Err.Raise 8732,,"Expecting , delimiter" End If idx = idx + 1 Loop idx = idx + 1 ParseArray = values.Items End Function Private Function ParseString(ByRef str, ByRef idx) Dim chunks, content, terminator, ms, esc, char Set chunks = CreateObject("Scripting.Dictionary") Do Set ms = StringChunk.Execute(Mid(str, idx)) If ms.Count = 0 Then Err.Raise 8732,,"Unterminated string starting" End If content = ms(0).Submatches(0) terminator = ms(0).Submatches(1) If Len(content) > 0 Then chunks.Add chunks.Count, content End If idx = idx + ms(0).Length If terminator = """" Then Exit Do ElseIf terminator <> "\" Then Err.Raise 8732,,"Invalid control character" End If esc = Mid(str, idx, 1) If esc <> "u" Then Select Case esc Case """" char = """" Case "\" char = "\" Case "/" char = "/" Case "b" char = b Case "f" char = f Case "n" char = n Case "r" char = r Case "t" char = t Case Else Err.Raise 8732,,"Invalid escape" End Select idx = idx + 1 Else char = ChrW("&H" & Mid(str, idx + 1, 4)) idx = idx + 5 End If chunks.Add chunks.Count, char Loop ParseString = Join(chunks.Items, "") End Function Private Function SkipWhitespace(ByRef str, ByVal idx) Do While idx <= Len(str) And _ InStr(Whitespace, Mid(str, idx, 1)) > 0 idx = idx + 1 Loop SkipWhitespace = idx End Function End Class
Example.vbs
'Author: Demon 'Date: 2012/5/3 'Website: https://demon.tw Dim fso, json, str, o, i Set json = New VbsJson Set fso = WScript.CreateObject("Scripting.Filesystemobject") str = fso.OpenTextFile("json.txt").ReadAll Set o = json.Decode(str) WScript.Echo o("Image")("Width") WScript.Echo o("Image")("Height") WScript.Echo o("Image")("Title") WScript.Echo o("Image")("Thumbnail")("Url") For Each i In o("Image")("IDs") WScript.Echo i Next
json.txt
{
"Image": {
"Width": 800,
"Height": 600,
"Title": "View from 15th Floor",
"Thumbnail": {
"Url": "http://www.example.com/image/481989943",
"Height": 125,
"Width": "100"
},
"IDs": [116, 943, 234, 38793]
}
}
欢迎测试和反馈BUG。
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随机文章:
测试了多组数据，对于标准格式的解析非常成功，呵呵，膜拜之。
比我那些投机取巧的方法强悍多了，我还得继续磨练。。
在firefox下面下载了个josnView试试~~~
你真应该改行做码农去。
[…] 在写VbsJson类的时候要用到UTF-16的知识，所以研究了一下UTF-16。那么VBS字符串内部编码是不是UTF-16呢？ […]
[…] 处理json格式的方法，可以参考乱码的系列文章：《VBS脚本之JSON数据解析》、《VBS脚本之JSON数据解析(二)》以及《VBS脚本之JSON数据解析(三)[终章]》。另外Demon的两篇文章：用VBS解析JSON格式数据之VbsJson类和《用VBS解析JSON格式数据》也是不得不看。 通告目前不可用，你可以至底部留下评论。 本文链接地址: http://www.itrenlife.com/?p=515版权所有 © 转载时请以链接形式注明作者和原始出处！ 上一篇：好用的vbs编辑器 没有评论▼ 我来说两句 […]
《VBS脚本之JSON数据解析(三)[终章]》很巧妙，赞一个！！
博主的对细节挖掘的很深，08年用脚本遍历过百度空间65万个账户，引流了大量ip，当时也对vbs处理JSON数据没辙，最后用js脚本实现的，
你好,首先谢谢你能提供这个类!
如果字段值小于1如：0.X的就会出现错误,vbsjson.asp，行 229.
指定key为整型字符串的时候，它会直接转换成Number类型存储，但是带小数点的浮点数字符串则依然按照字符串存储;或是说当值小于1时就做不了KEY，找了好久都没有找到解决的办法，希望能得到你的帮助。
谢谢！
只能改数据类型了，用navrchar，用不了money和numeric
有一个小bug
Private Function ParseArray(ByRef str, ByRef idx)
Dim c, values, value
Set values = CreateObject(“Scripting.Dictionary”)
idx = SkipWhitespace(str, idx)
c = Mid(str, idx, 1)
If c = “]” Then
ParseArray = values.Items
。。。。。。
需要在 ParseArray = values.Items 后面加一句 idx = idx + 1
否则处理不了类似这样的字符串 {“a”:[]}
高手
我解析Jason数据的办法比较笨…直接用空格Replace掉所有 {},”[] 然后split 再判断是不是: 是的话 上一个就是变量 后一个就是数据…因为我关注的只是全部的URL和相应的设置数据 这么干还凑合… 囧rz