XML操作类

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Class XMLDOMDocument
Private fNode,fANode
Private fErrInfo,fFileName,fOpen
Dim XmlDom

'返回节点的缩进字串
Private Property Get TabStr(byVal Node)
TabStr=""
If Node Is Nothing Then Exit Property
If not Node.parentNode Is nothing Then TabStr=" "&TabStr(Node.parentNode)
End Property

'返回一个子节点对象,ElementOBJ为父节点,ChildNodeObj要查找的节点,IsAttributeNode指出是否为属性对象
Public Property Get ChildNode(byVal ElementOBJ,byVal ChildNodeObj,byVal IsAttributeNode)
Dim Element
Set ChildNode=Nothing

If IsNull(ChildNodeObj) Then
If IsAttributeNode=false Then
Set ChildNode=fNode
Else
Set ChildNode=fANode
End If
Exit Property
ElseIf IsObject(ChildNodeObj) Then
Set ChildNode=ChildNodeObj
Exit Property
End If

Set Element=Nothing
If LCase(TypeName(ChildNodeObj))="string" and Trim(ChildNodeObj)<>"" Then
If IsNull(ElementOBJ) Then
Set Element=fNode
ElseIf LCase(TypeName(ElementOBJ))="string" Then
If Trim(ElementOBJ)<>"" Then
Set Element=XmlDom.selectSingleNode("//"&Trim(ElementOBJ))
If Lcase(Element.nodeTypeString)="attribute" Then Set Element=Element.selectSingleNode("..")
End If
ElseIf IsObject(ElementOBJ) Then
Set Element=ElementOBJ
End If

If Element Is Nothing Then
Set ChildNode=XmlDom.selectSingleNode("//"&Trim(ChildNodeObj))
ElseIf IsAttributeNode=true Then
Set ChildNode=Element.selectSingleNode("./@"&Trim(ChildNodeObj))
Else
Set ChildNode=Element.selectSingleNode("./"&Trim(ChildNodeObj))
End If
End If
End Property

'读取最后的错误信息
Public Property Get ErrInfo
ErrInfo=fErrInfo
End Property

'给xml内容
Public Property Get xmlText(byVal ElementOBJ)
xmlText=""
If fopen=false Then Exit Property

Set ElementOBJ=ChildNode(XmlDom,ElementOBJ,false)
If ElementOBJ Is Nothing Then Set ElementOBJ=XmlDom

xmlText=ElementOBJ.xml
End Property

'=================================================================
'类初始化
Private Sub Class_Initialize()
Set XmlDom=CreateObject("Microsoft.XMLDOM")
XmlDom.preserveWhiteSpace=true

Set fNode=Nothing
Set fANode=Nothing

fErrInfo=""
fFileName=""
fopen=false
End Sub

'类释放
Private Sub Class_Terminate()
Set fNode=Nothing
Set fANode=Nothing
Set XmlDom=nothing
fopen=false
End Sub

'=====================================================================
'建立一个XML文件，RootElementName：根结点名。XSLURL：使用XSL样式地址
'返回根结点
Function Create(byVal RootElementName,byVal XslUrl)
Dim PINode,RootElement

Set Create=Nothing

If (XmlDom Is Nothing) Or (fopen=true) Then Exit Function

If Trim(RootElementName)="" Then RootElementName="Root"

Set PINode=XmlDom.CreateProcessingInstruction("xml", "version=""1.0"" encoding=""GB2312""")
XmlDom.appendChild PINode

Set PINode=XMLDOM.CreateProcessingInstruction("xml-stylesheet", "type=""text/xsl"" href="""&XslUrl&"""")
XmlDom.appendChild PINode

Set RootElement=XmlDom.createElement(Trim(RootElementName))
XmlDom.appendChild RootElement

Set Create=RootElement

fopen=True
set fNode=RootElement
End Function

'开打一个已经存在的XML文件,返回打开状态
Function Open(byVal xmlSourceFile)
Open=false

xmlSourceFile=Trim(xmlSourceFile)
If xmlSourceFile="" Then Exit Function

XmlDom.async = false
XmlDom.load xmlSourceFile

fFileName=xmlSourceFile

If not IsError Then
Open=true
fopen=true
End If
End Function

'关闭
Sub Close()
Set fNode=Nothing
Set fANode=Nothing

fErrInfo=""
fFileName=""
fopen=false
End Sub

'读取一个NodeOBJ的节点Text的值
'NodeOBJ可以是节点对象或节点名，为null就取当前默认fNode
Function getNodeText(byVal NodeOBJ)
getNodeText=""
If fopen=false Then Exit Function

Set NodeOBJ=ChildNode(null,NodeOBJ,false)
If NodeOBJ Is Nothing Then Exit Function

If Lcase(NodeOBJ.nodeTypeString)="element" Then
set fNode=NodeOBJ
Else
set fANode=NodeOBJ
End If
getNodeText=NodeOBJ.text
End function

'插入在BefelementOBJ下面一个名为ElementName，Value为ElementText的子节点。
'IsFirst：是否插在第一个位置；IsCDATA：说明节点的值是否属于CDATA类型
'插入成功就返回新插入这个节点
'BefelementOBJ可以是对象也可以是节点名，为null就取当前默认对象
Function InsertElement(byVal BefelementOBJ,byVal ElementName,byVal ElementText,byVal IsFirst,byVal IsCDATA)
Dim Element,TextSection,SpaceStr
Set InsertElement=Nothing

If not fopen Then Exit Function

Set BefelementOBJ=ChildNode(XmlDom,BefelementOBJ,false)
If BefelementOBJ Is Nothing Then Exit Function

Set Element=XmlDom.CreateElement(Trim(ElementName))

'SpaceStr=vbCrLf&TabStr(BefelementOBJ)
'Set STabStr=XmlDom.CreateTextNode(SpaceStr)

'If Len(SpaceStr)>2 Then SpaceStr=Left(SpaceStr,Len(SpaceStr)-2)
'Set ETabStr=XmlDom.CreateTextNode(SpaceStr)

If IsFirst=true Then
'BefelementOBJ.InsertBefore ETabStr,BefelementOBJ.firstchild
BefelementOBJ.InsertBefore Element,BefelementOBJ.firstchild
'BefelementOBJ.InsertBefore STabStr,BefelementOBJ.firstchild
Else
'BefelementOBJ.appendChild STabStr
BefelementOBJ.appendChild Element
'BefelementOBJ.appendChild ETabStr
End If

If IsCDATA=true Then
set TextSection=XmlDom.createCDATASection(ElementText)
Element.appendChild TextSection
ElseIf ElementText<>"" Then
Element.Text=ElementText
End If

Set InsertElement=Element
Set fNode=Element
End Function

'在ElementOBJ节点上插入或修改名为AttributeName，值为：AttributeText的属性
'如果已经存在名为AttributeName的属性对象，就进行修改。
'返回插入或修改属性的Node
'ElementOBJ可以是Element对象或名，为null就取当前默认对象
Function setAttributeNode(byVal ElementOBJ,byVal AttributeName,byVal AttributeText)
Dim AttributeNode
Set setAttributeNode=nothing

If not fopen Then Exit Function

Set ElementOBJ=ChildNode(XmlDom,ElementOBJ,false)
If ElementOBJ Is Nothing Then Exit Function

Set AttributeNode=ElementOBJ.attributes.getNamedItem(AttributeName)
If AttributeNode Is nothing Then
Set AttributeNode=XmlDom.CreateAttribute(AttributeName)
ElementOBJ.setAttributeNode AttributeNode
End If
AttributeNode.text=AttributeText

set fNode=ElementOBJ
set fANode=AttributeNode
Set setAttributeNode=AttributeNode
End Function

'修改ElementOBJ节点的Text值，并返回这个节点
'ElementOBJ可以对象或对象名，为null就取当前默认对象
Function UpdateNodeText(byVal ElementOBJ,byVal NewElementText,byVal IsCDATA)
Dim TextSection

set UpdateNodeText=nothing
If not fopen Then Exit Function

Set ElementOBJ=ChildNode(XmlDom,ElementOBJ,false)
If ElementOBJ Is Nothing Then Exit Function

If IsCDATA=true Then
set TextSection=XmlDom.createCDATASection(NewElementText)
If ElementOBJ.firstchild Is Nothing Then
ElementOBJ.appendChild TextSection
ElseIf LCase(ElementOBJ.firstchild.nodeTypeString)="cdatasection" Then
ElementOBJ.replaceChild TextSection,ElementOBJ.firstchild
End If
Else
ElementOBJ.Text=NewElementText
End If

set fNode=ElementOBJ
Set UpdateNodeText=ElementOBJ
End Function

'返回符合testValue条件的第一个ElementNode，为null就取当前默认对象
Function getElementNode(byVal ElementName,byVal testValue)
Dim Element,regEx,baseName

Set getElementNode=nothing
If not fopen Then Exit Function

testValue=Trim(testValue)
Set regEx=New RegExp
regEx.Pattern="^[A-Za-z]+"
regEx.IgnoreCase=true
If regEx.Test(testValue) Then testValue="/"&testValue
Set regEx=nothing

baseName=LCase(Right(ElementName,Len(ElementName)-InStrRev(ElementName,"/",-1)))

Set Element=XmlDom.SelectSingleNode("//"&ElementName&testValue)

If Element Is Nothing Then
'Response.write ElementName&testValue
Set getElementNode=nothing
Exit Function
End If

Do While LCase(Element.baseName)<>baseName
Set Element=Element.selectSingleNode("..")
If Element Is Nothing Then Exit Do
Loop

If LCase(Element.baseName)<>baseName Then
Set getElementNode=nothing
Else
Set getElementNode=Element
If Lcase(Element.nodeTypeString)="element" Then
Set fNode=Element
Else
Set fANode=Element
End If
End If
End Function

'删除一个子节点
Function removeChild(byVal ElementOBJ)
removeChild=false
If not fopen Then Exit Function

Set ElementOBJ=ChildNode(null,ElementOBJ,false)
If ElementOBJ Is Nothing Then Exit Function

'response.write ElementOBJ.baseName

If Lcase(ElementOBJ.nodeTypeString)="element" Then
If ElementOBJ Is fNode Then set fNode=Nothing
If ElementOBJ.parentNode Is Nothing Then
XmlDom.removeChild(ElementOBJ)
Else
ElementOBJ.parentNode.removeChild(ElementOBJ)
End If
removeChild=True
End If
End Function

'清空一个节点所有子节点
Function ClearNode(byVal ElementOBJ)
set ClearNode=Nothing
If not fopen Then Exit Function

Set ElementOBJ=ChildNode(null,ElementOBJ,false)
If ElementOBJ Is Nothing Then Exit Function

ElementOBJ.text=""
ElementOBJ.removeChild(ElementOBJ.firstchild)

Set ClearNode=ElementOBJ
Set fNode=ElementOBJ
End Function

'删除子节点的一个属性
Function removeAttributeNode(byVal ElementOBJ,byVal AttributeOBJ)
removeAttributeNode=false
If not fopen Then Exit Function

Set ElementOBJ=ChildNode(XmlDom,ElementOBJ,false)
If ElementOBJ Is Nothing Then Exit Function

Set AttributeOBJ=ChildNode(ElementOBJ,AttributeOBJ,true)
If not AttributeOBJ Is nothing Then
ElementOBJ.removeAttributeNode(AttributeOBJ)
removeAttributeNode=True
End If
End Function

'保存打开过的文件，只要保证FileName不为空就可以实现保存
Function Save()
On Error Resume Next
Save=false
If (not fopen) or (fFileName="") Then Exit Function

XmlDom.Save fFileName
Save=(not IsError)
If Err.number<>0 then
Err.clear
Save=false
End If
End Function

'另存为XML文件，只要保证FileName不为空就可以实现保存
Function SaveAs(SaveFileName)
On Error Resume Next
SaveAs=false
If (not fopen) or SaveFileName="" Then Exit Function
XmlDom.Save SaveFileName
SaveAs=(not IsError)
If Err.number<>0 then
Err.clear
SaveAs=false
End If
End Function

'检查并打印错误信息
Private Function IsError()
If XmlDom.ParseError.errorcode<>0 Then
fErrInfo="<h1>Error"&XmlDom.ParseError.errorcode&"</h1>"
fErrInfo=fErrInfo&"<B>Reason :</B>"&XmlDom.ParseError.reason&"<br>"
fErrInfo=fErrInfo&"<B>URL &nbsp; &nbsp;:</B>"&XmlDom.ParseError.url&"<br>"
fErrInfo=fErrInfo&"<B>Line &nbsp; :</B>"&XmlDom.ParseError.line&"<br>"
fErrInfo=fErrInfo&"<B>FilePos:</B>"&XmlDom.ParseError.filepos&"<br>"
fErrInfo=fErrInfo&"<B>srcText:</B>"&XmlDom.ParseError.srcText&"<br>"
IsError=True
Else
IsError=False
End If
End Function
End Class
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