(VB.NET) Compress XML Tree

Demonstrates how to compress and restore the entire subtree rooted at an XML node.

The input XML, available at http://www.chilkatsoft.com/data/compress2.xml, is this:

<root>
    <lazydog>
        <fox>The quick brown fox jumps over the lazy dog</fox>
    </lazydog>
    <fox>The quick brown fox jumps over the lazy dog</fox>
    <child>
        <grandchild>The quick brown fox jumps over the lazy dog</grandchild>
    </child>
    <child>
        <grandchild>The quick brown fox jumps over the lazy dog</grandchild>
    </child>
</root>

Download: Chilkat .NET Assemblies

Dim xml As New Chilkat.Xml()

Dim success As Boolean
'  The sample input XML is available at http://www.chilkatsoft.com/data/compress2.xml
success = xml.LoadXmlFile("compress2.xml")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & xml.LastErrorText & vbCrLf
    Exit Sub
End If


'  Zip compress the root node's entire subtree:
xml.ZipTree()

'  Examine the new XML document:
TextBox1.Text = TextBox1.Text & xml.GetXml() & vbCrLf

'  This is the XML w/ the compressed subtree in Base64 encoded format:
'  
<root><![CDATA[4+WyKcrPL7Hj5VIAApucxKrKlPx0KBcslJZfYReSkapQWJqZnK2QVJRfnqcAFFPIKs0tKFbIL0st
UigBSoN0KgC12uiDNECN00c1jyKzkjMyc1KQHZZelJiXAhElyUwkfTBnovDoYZGNPjTUAQ==
]]></root>


'  Now uncompress and show that the original subtree was restored:
xml.UnzipTree()
TextBox1.Text = TextBox1.Text & xml.GetXml() & vbCrLf