(Objective-C) 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>

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoXml.h>

CkoXml *xml = [[CkoXml alloc] init];

BOOL success;
// The sample input XML is available at http://www.chilkatsoft.com/data/compress2.xml
success = [xml LoadXmlFile: @"compress2.xml"];
if (success != YES) {
    NSLog(@"%@",xml.LastErrorText);
    return;
}

// Zip compress the root node's entire subtree:
success = [xml ZipTree];

// Examine the new XML document:
NSLog(@"%@",[xml GetXml]);

// 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:
success = [xml UnzipTree];
NSLog(@"%@",[xml GetXml]);