从MS Project VBA中的XML文件中删除节点

Question

我想使用MS Project 2007中的VBA从我的xml文件中删除一个节点。

应该很简单，但我无法运行它。

这是我的XML

<config id="config" ConfigSaveDate="2011-03-31 21:32:55" ConfigSchemaVersion="1.02">
    <Custom> 
    </Custom>
    <Program>
      <DateFormat>yyyy-mm-dd hh:mm:ss</DateFormat> 
    </Program>
    <ProjectFile ProjectFileName="projectfile1.mpp">
      <RevisionNumber>201</RevisionNumber> 
      <FileName>projectfile1.mpp</FileName> 
      <LastSaveDate>2011-03-23 16:45:19</LastSaveDate> 
    </ProjectFile>
    <ProjectFile ProjectFileName="projectfile2bedeleted.mpp">
      <RevisionNumber>115</RevisionNumber> 
      <FileName>projectfile2bedeleted.mpp</FileName> 
      <LastSaveDate>2011-03-31 21:12:55</LastSaveDate> 
    </ProjectFile>
    <ProjectFile ProjectFileName="projectfile2.mpp">
      <RevisionNumber>315</RevisionNumber> 
      <FileName>projectfile2.mpp</FileName> 
      <LastSaveDate>2011-03-31 21:32:55</LastSaveDate> 
    </ProjectFile>
</config>

这是我的VBA代码

Function configProjListDelete(configPath As String, ProjFiles As Variant) As Integer

  ' This function shall delete <ProjectFile> tags from the config.xml
  ' and shall delete coresponding project xml files from HD
  ' It shall return number of deleted files

  ' configPath is the  path to the xml folder
  ' ProjFiles is an array of file names of to be deleted files in above mentioned folder

  Dim xml As MSXML2.DOMDocument
  Dim RootElem As MSXML2.IXMLDOMElement
  'Dim cxp1 As CustomXMLPart
  Dim delNode As MSXML2.IXMLDOMNode ' XmlNode 'MSXML2.IXMLDOMElement
  Dim fSuccess As Boolean
  Dim ProjectFileList As MSXML2.IXMLDOMElement
  Dim fn As Variant 'file name in loop
  Dim i As Integer
  Dim delCnt As Integer

  If Not FileExists(configPath) Then
    ' given configFile doesn't exist return nothing
    Debug.Print "  iven config file doesn't exist. File: " & configPath
    GoTo ExitconfigProjListDelete
  End If

  'TODO: Catch empty ProjectFiles

  ' Initialize variables
  Set xml = New MSXML2.DOMDocument

  On Error GoTo HandleErr
  ' Load the  XML from disk, without validating it.
  ' Wait for the load to finish before proceeding.
  xml.async = False
  xml.validateOnParse = False
  fSuccess = xml.Load(configPath)
  On Error GoTo 0
  ' If anything went wrong, quit now.
  If Not fSuccess Then
    GoTo ExitconfigProjListDelete
  End If

  Set RootElem = xml.DocumentElement

  Debug.Print "- " & xml.getElementsByTagName("ProjectFile").Length & " ProjectFiles in config."

  i = 0
  delCnt = 0
  ' Loop through all ProjectFiles
  For Each ProjectFileList In xml.getElementsByTagName("ProjectFile")

    ' check if each project file name is one of the files to be deleted
    For Each fn In ProjFiles
      If fn = ProjectFileList.getElementsByTagName("FileName").NextNode.nodeTypedValue Then
        Debug.Print fn & " shall be deleted"

        ' remove it from the document

        ' here I'm struggeling!
        '#################################################
        ' How to delete the node <ProjectFile> and its childNodes?
        Set delNode = ProjectFileList.ParentNode
        xml.DocumentElement.RemoveChild (ProjectFileList) ' Error: 438 rough translation: "Object doesn't support this methode"

        ' This is all I've tried, but nothing works
        '===========================================
        'RootElem.RemoveChild (delNode)
        'xml.RemoveChild (delNode)
        'RootElem.RemoveChild (ProjectFileList.SelectSingleNode("ProjectFile"))
        'ProjectFileList.ParentNode.RemoveChild (ProjectFileList.ChildNodes(0))

        'Set objParent = datenode.ParentNode
        'xmldoc.DocumentElement.RemoveChild (objParent)

        'Set ProjectFileList = Empty


        delCnt = delCnt + 1
      End If
    Next fn

    i = i + 1
  Next ProjectFileList

  ' Save XML File
  If checkAppPath("Trying to update config file.") Then
    xml.Save CustomProperty("XMTMLMonitoring_AppPath") & "\" & m2w_config("SubFolder") & "\" & m2w_config("SubFolderData") & "\" & m2w_config("XMLConfigFileName")
    Debug.Print "  - Config has been updated and saved."
  Else
    MsgBox "Config data not exported to web." & Chr(10) & "Folder: '" & CustomProperty("XMTMLMonitoring_AppPath") & "\" & m2w_config("SubFolder") & "\" & m2w_config("SubFolderData") & Chr(10) & "doesn't exist. ", vbOKOnly, HEADLINE
  End If

  Set xml = Nothing

  configProjListDelete = delCnt

ExitconfigProjListDelete:
Exit Function

HandleErr:
  Debug.Print "XML File reading error " & Err.Number & ": " & Err.DESCRIPTION
  MsgBox "Error " & Err.Number & ": " & Err.DESCRIPTION
  On Error GoTo 0


End Function

我很高兴得到一些帮助！

Answer 1

您了解XPath吗？从代码的痛苦外观来看，您没有。不必使用大量的野蛮DOM方法来访问所需的节点，而是应该省去很多麻烦，而只需使用XPath即可一行访问它。

如果我正确理解您要执行的操作，则类似以下内容的内容可以替换整个double循环，从i=0到Next ProjectFileList：

For i = LBound(ProjFiles) To UBound(ProjFiles)
    Set deleteMe = XML.selectSingleNode( _
        "/config/ProjectFile[@ProjectFileName='" & ProjFiles(i) & "']")
    Set oldChild = deleteMe.parentNode.removeChild(deleteMe)
Next i

“引号”中的内容是XPath。希望这可以帮助。

附带说明一下，在XML文件中ProjectFileName具有FileName包含完全相同信息的属性和元素似乎效率低下，令人困惑并且容易出错。那是怎么回事？