(PowerShell) XML SearchForAttribute Method

Demonstrates the SearchForAttribute method.

The input XML, available at http://www.chilkatsoft.com/data/fruitSearch.xml, is this:

<root>
    <searchRoot>
        <fruit color="red">apple</fruit>
        <fruit color="green">pear</fruit>
        <veg color="orange">carrot</veg>
        <meat animal="cow">beef</meat>
        <xyz>
            <fruit color="blue">blueberry</fruit>
            <veg color="green">broccoli</veg>
        </xyz>
        <fruit color="purple">grape</fruit>
        <cheese color="yellow">cheddar</cheese>
    </searchRoot>
    <fruit color="red">strawberry</fruit>
    <fruit color="orange">peach</fruit>
</root>

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$xml = New-Object Chilkat.Xml

$success = $xml.LoadXmlFile("qa_data/xml/fruitSearch.xml")
if ($success -ne $true) {
    $($xml.LastErrorText)
    exit
}

# Search the sub-tree rooted at "searchRoot"
$xSearchRoot = $xml.FindChild("searchRoot")
if ($xml.LastMethodSuccess -eq $false) {
    $("searchRoot not found, searching from root.")
    $xSearchRoot = $xml.GetRoot()
}

# Search for all "fruit" nodes having a color attribute
# where the name of the color ends in "e"
$xBeginAfter = $xSearchRoot.GetSelf()
$xFound = $xSearchRoot.SearchForAttribute($xBeginAfter,"fruit","color","*e")
while (($xSearchRoot.LastMethodSuccess -eq $true)) {

    $($xFound.Content + ": " + $xFound.GetAttrValue("color"))

    $xBeginAfter = $xFound
    $xFound = $xSearchRoot.SearchForAttribute($xBeginAfter,"fruit","color","*e")
}

# The correct output is:
# grape: purple
# blueberry: blue

$("--------------------------")

# ---------------------------------------------------------------------------------
# Now do the same, but instead use SearchForAttribute2
# which updates the internal reference of the caller instead
# of returning the found node.

$xBeginAfter = $xSearchRoot.GetSelf()
$xSearch = $xSearchRoot.GetSelf()

$success = $xSearch.SearchForAttribute2($xBeginAfter,"fruit","color","*e")
while ($success -eq $true) {

    $($xSearch.Content + ": " + $xSearch.GetAttrValue("color"))

    # Copy the internal references so that the next search
    # begins after the found node.
    $xBeginAfter.CopyRef($xSearch)
    $xSearch.CopyRef($xSearchRoot)

    $success = $xSearch.SearchForAttribute2($xBeginAfter,"fruit","color","*e")
}