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How to open a file, look for a line and replace/add text via a script?

Posted on 2008-10-28
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Last Modified: 2012-05-05
How would you recemend that I could open a file (Test1.log) and search for a line of text then pass data to that line via a script?  I have attached the file and the line I would like to edit.  I would like to be able to pass 123456789 as the value between the "", then save it (ex "123456789" />)
Before
<add key="websvc.PAD.ip"                      value= "" />

After
<add key="websvc.PAD.ip"                      value= "123456789" />

Please help...
Test1.log
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Question by:John_2000
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4 Comments
 
LVL 38

Expert Comment

by:Shift-3
ID: 22823955
Paste the script below into a text file with a .vbs extension.  Customize the value of the strFile variable with the location of the log file.  Running the script will replace any instances of the original string with the new one.


Const ForReading = 1
Const ForWriting = 2
Const TriStateUseDefault = -2
 
strFile = "c:\test1.log"
strOldString = "<add key=" & Chr(34) & "websvc.PAD.ip" & Chr(34) & "	    		value= " & Chr(34) & Chr(34) & " />"
strNewString = "<add key=" & Chr(34) & "websvc.PAD.ip" & Chr(34) & "	    		value= " & Chr(34) & "123456789" & Chr(34) & " />"
 
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objTextFile = objFSO.OpenTextFile(strFile, ForReading, False, TriStateUseDefault)
 
strText = objTextFile.ReadAll
strText = Replace(strText, strOldString, strNewString)
objTextFile.Close
 
Set objTextFile = objFSO.OpenTextFile(strFile, ForWriting)
 
objTextFile.Write strText
objTextFile.Close

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Author Comment

by:John_2000
ID: 22825441
That works great!  But one more thing.....If there was a value already between the quotes, it will not update.  Would it be easy adjust this code to reflect that?
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Accepted Solution

by:
Shift-3 earned 300 total points
ID: 22825883
This version will replace any line containing <add key="websvc.PAD.ip" with the new line.

It was adapted from http://www.microsoft.com/technet/scriptcenter/resources/qanda/nov04/hey1130.mspx


Const ForReading = 1
Const ForWriting = 2
Const TriStateUseDefault = -2
 
strFile = "c:\test1.log"
strOldString = "<add key=" & Chr(34) & "websvc.PAD.ip" & Chr(34)
strNewString = vbTab & vbTab & "<add key=" & Chr(34) & "websvc.PAD.ip" & Chr(34) & "                    value= " & Chr(34) & "123456789" & Chr(34) & " />"
 
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objTextFile = objFSO.OpenTextFile(strFile, ForReading, False, TriStateUseDefault)
 
Do Until objTextFile.AtEndOfStream
    strNextLine = objTextFile.Readline
 
    intLineFinder = InStr(strNextLine, strOldString)
    If intLineFinder <> 0 Then
        strNextLine = strNewString
    End If
 
    strNewFile = strNewFile & strNextLine & vbCrLf
Loop
 
objTextFile.Close
 
Set objTextFile = objFSO.OpenTextFile(strFile, ForWriting)
 
objTextFile.WriteLine strNewFile
objTextFile.Close

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Author Closing Comment

by:John_2000
ID: 31510822
Nice Job!
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