当然了，除了上一篇所讲的操作，对这三种文件的操作还包括了增删改查。幸运的是，txt格式跟ini格式因为保存的文件的样式是一样的，所以可以用相同的函数去操作，具体如下：
'读取txt格式环境变量文件里的所有值，存储到Dictionary对象里
Public Function ReadTxtIniEnvVars(fileName)
Dim txtStream,txtStr,txtArray,txtDic,i
Set txtStream = syFSO.OpenTextFile(fileName)
Set txtDic = CreateObject("Scripting.Dictionary")
txtStr = txtStream.ReadAll
txtArray = Split(txtStr,vbcrlf)
For i=1 to UBound(txtArray) -1
If Trim(Split(txtArray(i),"=")(0) )<>Empty And Trim(Split(txtArray(i),"=")(0) )<>"" Then
txtDic.Add Trim(Split(txtArray(i),"=")(0) ),Trim(Split(txtArray(i),"=")(1) )
End If
Next
Set ReadTxtIniEnvVars = txtDic
Set txtDic = nothing
End Function
'更新txt文件里指定的环境变量值
'isRemove = true执行删除操作。否则执行更新
Public Sub UpdateTxtIniEnvVars(fileName,varName,varValue,isRemove)
Dim txtStream,txtStr,temp
Set txtStream = syFSO.OpenTextFile(fileName,1)
Do Until txtStream.AtEndOfLine
txtStr = txtStream.ReadLine
If Trim(Split(txtStr,"=")(0))=varName Then
If isRemove Then
txtStr = ""
Else
txtStr = varName & " = " & varValue
End If
End If
If txtStr<>"" Then
temp = temp + txtStr + vbcrlf
End If
Loop
txtStream.Close
Set txtStream = syFSO.OpenTextFile(fileName,2)
txtStream.Write temp
txtStream.Close
Set txtStr = nothing
End Sub
'增加环境变量到已经存在的txt配置文件里，加在原文件的末尾
Public Sub AddTxtIniEnvVars(fileName,varName,varValue)
Dim txtStream
Set txtStream = syFSO.OpenTextFile(fileName,8)
txtStream.WriteLine varName + " = " +varValue
txtStream.Close
End Sub
'在txt文件里删除一个已经存在的环境变量
Public Sub DelTxtIniEnvVars(fileName,varName)
UpdateTxtIniEnvVars fileName,varName,"",True
End Sub
华丽丽的分割线：————————————————————
下面的是关于xml文件里的环境变量的增删改查操作：
'读取xml文件里所有环境变量，返回一个DIctionary对象
Public Function ReadXmlEnvVars(fileName)
Dim xmlObj,xmlDic
Dim xmlRoot,xmlNode
Dim varName,varValue
Set xmlObj = CreateObject("MSXML.DOMDocument")
Set xmlDic = CreateObject("Scripting.Dictionary")
xmlObj.Load fileName
Set xmlRoot = xmlObj.LastChild
For i = 0 to xmlRoot.ChildNodes.Length - 1
Set xmlNode = xmlRoot.ChildNodes.Item(i)
varName = xmlNode.ChildNodes.Item(0).nodeTypedValue
varValue = xmlNode.ChildNodes.Item(1).nodeTypedValue
xmlDic.Add varName,varValue
Next
Set ReadXmlEnvVars = xmlDic
Set xmlObj = nothing
Set xmlDic = nothing
Set xmlRoot = nothing
Set xmlNode = nothing
End Function
'更新xml格式环境变量文件
Public Sub UpdateXmlEnvVars(fileName,varName,varValue)
Dim xmlObj
Dim xmlRoot,xmlNode
Dim nodeName,nodeValue
Set xmlObj = CreateObject("MSXML.DOMDocument")
xmlObj.Load fileName
Set xmlRoot = xmlObj.LastChild
For i = 0 to xmlRoot.ChildNodes.Length - 1
Set xmlNode = xmlRoot.ChildNodes.Item(i)
nodeName = xmlNode.ChildNodes.Item(0).nodeTypedValue
'nodeValue = xmlNode.ChildNodes.Item(1).nodeTypedValue
If UCase(Trim(nodeName)) = UCase(Trim(varName)) Then
xmlNode.ChildNodes.Item(1).nodeTypedValue = varValue
End If
Next
xmlObj.Save fileName
Set xmlObj = nothing
Set xmlRoot = nothing
Set xmlNode = nothing
End Sub
'删除xml格式环境变量文件里的一个节点
Public Sub DelXmlEnvVars(fileName,varName)
Dim xmlObj
Dim xmlRoot,xmlNode
Dim nodeName,nodeValue
Set xmlObj = CreateObject("MSXML.DOMDocument")
xmlObj.Load fileName
Set xmlRoot = xmlObj.LastChild
If xmlRoot.ChildNodes.Length = 1 Then
Exit Sub
End If
For i = 0 to xmlRoot.ChildNodes.Length - 1
Set xmlNode = xmlRoot.ChildNodes.Item(i)
nodeName = xmlNode.ChildNodes.Item(0).nodeTypedValue
'nodeValue = xmlNode.ChildNodes.Item(1).nodeTypedValue
If UCase(Trim(nodeName)) = UCase(Trim(varName)) Then
xmlRoot.RemoveChild(xmlNode)
Exit For
End If
Next
xmlObj.Save fileName
Set xmlObj = nothing
Set xmlRoot = nothing
Set xmlNode = nothing
End Sub
'增加一个新的节点到xml格式的环境变量
'可以增加判断，如果varName重复，则调用UpdateXmlEnvVars()
Public Sub AddXmlEnvVars(fileName,varName,varValue)
Dim xmlObj
Dim xmlRoot,xmlNode
Dim nodeName,nodeValue
Dim index
Set xmlObj = CreateObject("MSXML.DOMDocument")
xmlObj.Load fileName
Set xmlRoot = xmlObj.LastChild
Set xmlNode = xmlRoot.ChildNodes.Item(0).CloneNode(1)
xmlNode.ChildNodes.Item(0).nodeTypedValue = varName
xmlNode.ChildNodes.Item(1).nodeTypedValue = varValue
xmlRoot.AppendChild(xmlNode)
xmlObj.Save fileName
Set xmlObj = nothing
Set xmlRoot = nothing
Set xmlNode = nothing
End Sub
以上这些就是我最近总结的一套关于QTP三种格式的环境变量的动态存储，当然有兴趣的童鞋可以将它封装起来。欢迎关注我的博客：http://www.cnblogs.com/ryansunyu/