(MFC) Removing / Deleting Child Nodes from XML

Demonstrates various methods for removing child nodes from an XML document.

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 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 *xyz = 0;

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

    // The RemoveChild method removes (discards) all direct
    // children having the specified tag:
    xml.RemoveChild("fruit");

    // Show the resulting XML:
    strOut.append("Result with all direct children having a tag equal to \"fruit\" removed:");
    strOut.append("\r\n");
    strOut.append(xml.getXml());
    strOut.append("\r\n");

    // The XML with the "fruit" direct children removed is shown below:
    // Notice that the "fruit" node beneath "xyz" was not removed.
    // This correct because it was not a direct child of the calling node.

    // <root>
    //     <veg color="orange">carrot</veg>
    //     <meat animal="cow">beef</meat>
    //     <xyz>
    //         <fruit color="blue">blueberry</fruit>
    //         <veg color="green">broccoli</veg>
    //     </xyz>
    //     <cheese color="yellow">cheddar</cheese>
    // </root>

    // --------------------------------------------------------------------------
    // Restore the original XML:
    success = xml.LoadXmlFile("fruit.xml");

    // The RemoveChildWithContent method removes the child
    // having the exact content specified, regardless of the tag.  
    // For example:
    xml.RemoveChildWithContent("pear");

    // Show the resulting XML:
    strOut.append("Result with the node containing \"pear\" removed:");
    strOut.append("\r\n");
    strOut.append(xml.getXml());
    strOut.append("\r\n");

    // --------------------------------------------------------------------------
    // Restore the original XML:
    success = xml.LoadXmlFile("fruit.xml");

    // The RemoveChildByIndex method removes the Nth direct
    // child.  Indexing begins at 0.  The "xyz" child is at index 4:
    xml.RemoveChildByIndex(4);

    // Show the resulting XML:
    // Notice that the entire "xyz" subtree is removed.
    strOut.append("Result with the node at index 4 removed:");
    strOut.append("\r\n");
    strOut.append(xml.getXml());
    strOut.append("\r\n");

    // --------------------------------------------------------------------------
    // Restore the original XML:
    success = xml.LoadXmlFile("fruit.xml");

    // Navigate to the node with tag "xyz"
    xyz = xml.FindChild("xyz");

    // Remove the "xyz" subtree making it it's own XML document
    // with the "xyz" node at the root:
    xyz->RemoveFromTree();

    // Show both XML documents:
    strOut.append(xyz->getXml());
    strOut.append("\r\n");
    strOut.append(xml.getXml());
    strOut.append("\r\n");

    // Also, the TreeId property is an integer value assigned
    // to nodes in an XML document.  All nodes belonging to
    // the same XML document will have the same TreeId.
    // Notice that the "xyz" node now has a different TreeId:
    strOut.append("xyz TreeId = ");
    strOut.appendInt(xyz->get_TreeId());
    strOut.append("\r\n");
    strOut.append("xml TreeId = ");
    strOut.appendInt(xml.get_TreeId());
    strOut.append("\r\n");

    delete xyz;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }