(MFC) XML Tree Traversal Order for Search* Methods

The Chilkat XML API provides a number of Search* methods for locating XML nodes based on criteria. These methods traverse an XML document in a breadth-first order. (See Breadth-First Search).

The XML document used in this example has the following tree structure:

The nodes are traversed in the order: A, B, C, D, E, F, G, H, I, J, K.

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

<a>crocodileA
    <b>crocodileB
        <d>crocodileD</d>
        <e>crocodileE
            <h>crocodileH</h>
            <i>crocodileI</i>
        </e>
    </b>
    <c>crocodileC
        <f>crocodileF</f>
        <g>crocodileG
            <j>crocodileJ</j>
            <k>crocodileK</k>
        </g>
    </c>
</a>

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// Needs #include <CkXml.h>

    CkString strOut;

    CkXml xml;
    CkXml *xBeginAfter = 0;
    CkXml *xFound = 0;

    bool success;
    //  The sample input XML is available at http://www.chilkatsoft.com/data/searchOrder.xml
    success = xml.LoadXmlFile("searchOrder.xml");
    if (success != true) {
        strOut.append(xml.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  IMPORTANT:  The following loop for iterating over all
    //  matching nodes performs reasonably well for small to
    //  mid-size XML documents or sub-trees.  Performance
    //  can be poor when the sub-tree contains many thousands
    //  of nodes (or more).

    //  NOTE:  The search is always rooted at the calling node.
    //  In this example, it happens to also be the root node of the entire
    //  XML document.  Searches can be performed on sub-trees
    //  within the document by calling the Search* method from
    //  the root node of a sub-tree.

    //  Demonstrate the breadth-first traversal:
    xBeginAfter = 0;
    xFound = xml.SearchAllForContent(*xBeginAfter,"*croc*");
    while (!(xFound == 0 )) {

        strOut.append(xFound->tag());
        strOut.append("\r\n");

        delete xBeginAfter;
        xBeginAfter = xFound;
        xFound = xml.SearchAllForContent(*xBeginAfter,"*croc*");
    }

    delete xBeginAfter;

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());