(Objective-C) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

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

<root>
    <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>
</root>

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

#import <CkoXml.h>

CkoXml *xml = [[CkoXml alloc] init];
CkoXml *child = 0;
CkoXml *nextSibling = 0;
CkoXml *prevSibling = 0;

BOOL success = [xml LoadXmlFile: @"qa_data/xml/fruit.xml"];
if (success != YES) {
    NSLog(@"%@",xml.LastErrorText);
    return;
}

// Iterate over the direct children by using FirstChild / NextSibling
child = [xml FirstChild];
BOOL bContinue = xml.LastMethodSuccess;
while ((bContinue == YES)) {
    NSLog(@"%@%@%@",child.Tag,@" : ",child.Content);
    nextSibling = [child NextSibling];
    bContinue = child.LastMethodSuccess;

    child = nextSibling;
}

NSLog(@"%@",@"-----");

// Do the same, but with FirstChild2 / NextSibling2 to avoid
// creating so many XML object instances:
success = [xml FirstChild2];
while (success == YES) {
    NSLog(@"%@%@%@",xml.Tag,@" : ",xml.Content);
    success = [xml NextSibling2];
}

// Revert back up to the parent:
success = [xml GetParent2];

NSLog(@"%@",@"-----");

// Iterate in reverse order using LastChild / PreviousSibling
child = [xml LastChild];
bContinue = xml.LastMethodSuccess;
while ((bContinue == YES)) {
    NSLog(@"%@%@%@",child.Tag,@" : ",child.Content);
    prevSibling = [child PreviousSibling];
    bContinue = child.LastMethodSuccess;

    child = prevSibling;
}

NSLog(@"%@",@"-----");

// Do the same, but with LastChild2 / PreviousSibling2 to avoid
// creating so many XML object instances:
success = [xml LastChild2];
while (success == YES) {
    NSLog(@"%@%@%@",xml.Tag,@" : ",xml.Content);
    success = [xml PreviousSibling2];
}

// Revert back up to the parent:
success = [xml GetParent2];