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xmlpowershell

How to change value of XML element with powershell

I want to use Powershell to map buttons for my game. The game uses XML for these values. I need to change the value of <InputMapping>Service2</InputMapping>

The XML looks like this:

<JoystickButtons>
    <ButtonName>Service 2</ButtonName>
    <InputMapping>Service2</InputMapping>
</JoystickButtons>

Here is my script so far

[xml]$gameInfo = Get-Content $game.fullname
$xml = New-Object XML
$xml.Load("C:\PATH\$game")
$Buttons = $xml.SelectNodes("/JoystickButtons")

What should I do?

Solution

  • You're close, if you want to target the InputMapping node then your XPath should be JoystickButtons/InputMapping and from there you access the .InnerText property and assign a new value to it. Lastly, .Save using the path you used to load the XML or a new path if you decide so.

    $xmlPath = "C:\PATH\$game"
$xml = [xml]::new()
$xml.PreserveWhitespace = $true
$xml.Load($xmlPath)
$xml.SelectSingleNode('JoystickButtons/InputMapping').InnerText = 'newValue'
$xml.Save($xmlPath)

    If you want to target the InputMapping node where specifically the text is equal to Service2 you can use the XPath:

    $xml.SelectSingleNode("JoystickButtons/InputMapping[text()='Service2']")

    And lastly, if there were multiple InputMapping nodes and you want to update them all, you would use .SelectNodes instead of .SelectSingleNode and a loop would be required to update each node.