(MFC) XML SearchForAttribute Method

Demonstrates the SearchForAttribute method.

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

<root>
    <searchRoot>
        <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>
    </searchRoot>
    <fruit color="red">strawberry</fruit>
    <fruit color="orange">peach</fruit>
</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 *xSearchRoot = 0;
    CkXml *xBeginAfter = 0;
    CkXml *xFound = 0;

    bool success = xml.LoadXmlFile("qa_data/xml/fruitSearch.xml");
    if (success != true) {
        strOut.append(xml.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Search the sub-tree rooted at "searchRoot"
    xSearchRoot = xml.FindChild("searchRoot");
    if (xml.get_LastMethodSuccess() == false) {
        strOut.append("searchRoot not found, searching from root.");
        strOut.append("\r\n");
        xSearchRoot = xml.GetRoot();
    }

    // Search for all "fruit" nodes having a color attribute
    // where the name of the color ends in "e"
    xBeginAfter = xSearchRoot->GetSelf();
    xFound = xSearchRoot->SearchForAttribute(*xBeginAfter,"fruit","color","*e");
    while ((xSearchRoot->get_LastMethodSuccess() == true)) {

        strOut.append(xFound->content());
        strOut.append(": ");
        strOut.append(xFound->getAttrValue("color"));
        strOut.append("\r\n");

        delete xBeginAfter;
        xBeginAfter = *xFound;
        xFound = xSearchRoot->SearchForAttribute(*xBeginAfter,"fruit","color","*e");
    }

    // The correct output is:
    // grape: purple
    // blueberry: blue

    delete xBeginAfter;

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

    // ---------------------------------------------------------------------------------
    // Now do the same, but instead use SearchForAttribute2
    // which updates the internal reference of the caller instead
    // of returning the found node.
    CkXml *xSearch = 0;

    xBeginAfter = xSearchRoot->GetSelf();
    xSearch = xSearchRoot->GetSelf();

    success = xSearch->SearchForAttribute2(*xBeginAfter,"fruit","color","*e");
    while (success == true) {

        strOut.append(xSearch->content());
        strOut.append(": ");
        strOut.append(xSearch->getAttrValue("color"));
        strOut.append("\r\n");

        // Copy the internal references so that the next search
        // begins after the found node.
        xBeginAfter->CopyRef(*xSearch);
        xSearch->CopyRef(*xSearchRoot);

        success = xSearch->SearchForAttribute2(*xBeginAfter,"fruit","color","*e");
    }

    delete xSearch;
    delete xBeginAfter;

    delete xSearchRoot;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }