(MFC) Iterate over Direct Child Nodes by Index

Demonstrates some ways to iterate over direct child nodes by index.

The input XML, available at http://www.chilkatsoft.com/data/get_child.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 C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkXml.h>

void ChilkatSample(void)
    {
    CkString strOut;

    CkXml xml;
    CkXml *child = 0;

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

    // The NumChildren property contains the number of direct
    // child nodes.  Note: The child nodes under "xyz" are NOT
    // direct children of "root".  Therefore, the "root" node has
    // 7 direct children
    strOut.append("NumChildren = ");
    strOut.appendInt(xml.get_NumChildren());
    strOut.append("\r\n");

    // Iterate over the direct children by index. The first child
    // is at index 0.
    int i;
    for (i = 0; i <= xml.get_NumChildren() - 1; i++) {
        //  access the tag and content directly by index:
        strOut.appendInt(i);
        strOut.append(": ");
        strOut.append(xml.getChildTagByIndex(i));
        strOut.append(" : ");
        strOut.append(xml.getChildContentByIndex(i));
        strOut.append("\r\n");

    }

    strOut.append("-----");
    strOut.append("\r\n");

    // Do the same as the above loop, but get the child node
    // and access the Tag and Content properties:
    for (i = 0; i <= xml.get_NumChildren() - 1; i++) {
        child = xml.GetChild(i);
        strOut.appendInt(i);
        strOut.append(": ");
        strOut.append(child->tag());
        strOut.append(" : ");
        strOut.append(child->content());
        strOut.append("\r\n");
        delete child;
    }

    strOut.append("-----");
    strOut.append("\r\n");

    // Do the same as the above loop, but instead of creating
    // a new object instance for each child, call GetChild2 to
    // update the object's reference instead.
    for (i = 0; i <= xml.get_NumChildren() - 1; i++) {
        // Navigate to the Nth child.  
        success = xml.GetChild2(i);
        strOut.appendInt(i);
        strOut.append(": ");
        strOut.append(xml.tag());
        strOut.append(" : ");
        strOut.append(xml.content());
        strOut.append("\r\n");
        // Navigate back up to the parent:
        success = xml.GetParent2();
    }

    strOut.append("-----");
    strOut.append("\r\n");

    // Notice that the Content of the "xyz" node is empty.  This is correct.
    // The "xyz" node has no Content, but 2 direct children


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }