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# querymainwindow.cpp Example File
xmlpatterns/recipes/querymainwindow.cpp

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     #include <QtGui>
     #include <QtXmlPatterns>

     #include "querymainwindow.h"

     QueryMainWindow::QueryMainWindow() : ui_defaultQueries(0)
     {
         setupUi(this);

         ui_defaultQueries = qFindChild<QComboBox*>(this, "defaultQueries");

         QMetaObject::connectSlotsByName(this);

         connect(ui_defaultQueries, SIGNAL(currentIndexChanged(int)), SLOT(displayQuery(int)));

         loadInputFile();

         const QStringList queries(QDir(":/files/", "*.xq").entryList());
         int len = queries.count();

         for(int i = 0; i < len; ++i)
             ui_defaultQueries->addItem(queries.at(i));
     }

     void QueryMainWindow::displayQuery(int index)
     {
         QFile queryFile(QString(":files/") + ui_defaultQueries->itemText(index));
         queryFile.open(QIODevice::ReadOnly);

         const QString query(QString::fromLatin1(queryFile.readAll()));

         qFindChild<QTextEdit*>(this, "queryTextEdit")->setPlainText(query);

         evaluate(query);
     }

     void QueryMainWindow::loadInputFile()
     {
         QFile forView;
         forView.setFileName(":/files/cookbook.xml");
         if (!forView.open(QIODevice::ReadOnly)) {
             QMessageBox::information(this,
                 tr("Unable to open file"), forView.errorString());
             return;
         }

         QTextStream in(&forView);
         QString inputDocument = in.readAll();
         qFindChild<QTextEdit*>(this, "inputTextEdit")->setPlainText(inputDocument);
     }

     void QueryMainWindow::evaluate(const QString &str)
     {
         /* This function takes the input string and displays the
          * appropriate output using QXmlQuery.
          */
         QXmlQuery query;

         QFile sourceDocument;
         sourceDocument.setFileName(":/files/cookbook.xml");
         sourceDocument.open(QIODevice::ReadOnly);
         query.bindVariable("inputDocument", &sourceDocument);

         query.setQuery(str);

         if(!query.isValid())
             return;

         QByteArray outArray;
         QBuffer buffer(&outArray);
         buffer.open(QIODevice::ReadWrite);

         QXmlFormatter formatter(query, &buffer);

         if(!query.evaluateTo(&formatter))
             return;

         buffer.close();
         qFindChild<QTextEdit*>(this, "outputTextEdit")->setPlainText(QString::fromUtf8(outArray.constData()));

     }