【QT示例】XML Schema Validation Example

项目文件：

//main.cpp//
#include <QtGui>
#include "mainwindow.h"

//! [0]
int main(int argc,char* argv[])
{
    Q_INIT_RESOURCE(schema);
    QApplication app(argc,argv);
    MainWindow* const window = new MainWindow;
    window->show();
    return app.exec();
}
//! [0]

//mainwindow.h//
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

#if defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
    #include "ui_schema_mobiles.h"
#else
    #include "ui_schema.h"
#endif

//! [0]
class MainWindow : public QMainWindow,private Ui::SchemaMainWindow
{
    Q_OBJECT

public:
    MainWindow();

private Q_SLOTS:
    void schemaSelected(int index);
    void instanceSelected(int index);
    void validate();
    void textChanged();

private:
    void moveCursor(int line,int column);
};
//! [0]
#endif

//mainwindow.cpp//
#include <QtGui>
#include <QtXmlPatterns>

#include "mainwindow.h"
#include "xmlSyntaxHighlighter.h"

//! [4]
class MessageHandler : public QAbstractMessageHandler
{
public:
    MessageHandler()
        : QAbstractMessageHandler(0)
    {
    }

    QString statusMessage() const
    {
        return m_description;
    }

    int line() const
    {
        return m_sourceLocation.line();
    }

    int column() const
    {
        return m_sourceLocation.column();
    }

protected:
    virtual void handleMessage(QtMsgType type,const QString &description,const QUrl &identifier,const QSourceLocation &sourceLocation)
    {
        Q_UNUSED(type);
        Q_UNUSED(identifier);

        m_messageType = type;
        m_description = description;
        m_sourceLocation = sourceLocation;
    }

private:
    QtMsgType m_messageType;
    QString m_description;
    QSourceLocation m_sourceLocation;
};
//! [4]

//! [0]
//窗口的构造函数
MainWindow::MainWindow()
{
    setupUi(this);

    //XmlSyntaxHighlighter  XML语法亮色
    new XmlSyntaxHighlighter(schemaView->document());
    new XmlSyntaxHighlighter(instanceEdit->document());

    schemaSelection->addItem(tr("Contact Schema"));
    schemaSelection->addItem(tr("Recipe Schema"));
    schemaSelection->addItem(tr("Order Schema"));

    instanceSelection->addItem(tr("Valid Contact Instance"));
    instanceSelection->addItem(tr("Invalid Contact Instance"));

    //信号与槽的关联connect(添加触发目标,发射信号,接收槽函数)
    connect(schemaSelection,SIGNAL(currentIndexChanged(int)),SLOT(schemaSelected(int)));
    connect(instanceSelection,SLOT(instanceSelected(int)));
    connect(validateButton,SIGNAL(clicked()),SLOT(validate()));
    connect(instanceEdit,SIGNAL(textChanged()),SLOT(textChanged()));

    //setAlignment文本设置 对齐
    validationStatus->setAlignment(Qt::AlignCenter | Qt::AlignVCenter);

    schemaSelected(0);
    instanceSelected(0);
}
//! [0]

//! [1]
void MainWindow::schemaSelected(int index)
{
    //清空选择项,按index添加选择项
    instanceSelection->clear();
    if (index == 0) {
        instanceSelection->addItem(tr("Valid Contact Instance"));
        instanceSelection->addItem(tr("Invalid Contact Instance"));
    } else if (index == 1) {
        instanceSelection->addItem(tr("Valid Recipe Instance"));
        instanceSelection->addItem(tr("Invalid Recipe Instance"));
    } else if (index == 2) {
        instanceSelection->addItem(tr("Valid Order Instance"));
        instanceSelection->addItem(tr("Invalid Order Instance"));
    }
    textChanged();

    //定义QFile，XSD格式
    QFile schemaFile(QString(":/schema_%1.xsd").arg(index));
    //以只读方式打开
    schemaFile.open(QIODevice::ReadOnly);
    //转换UTF8编码
    const QString schemaText(QString::fromUtf8(schemaFile.readAll()));
    //控件设置内容
    schemaView->setPlainText(schemaText);

    validate();
}
//! [1]

//! [2]
void MainWindow::instanceSelected(int index)
{
    QFile instanceFile(QString(":/instance_%1.xml").arg((2*schemaSelection->currentIndex()) + index));
    instanceFile.open(QIODevice::ReadOnly);
    const QString instanceText(QString::fromUtf8(instanceFile.readAll()));
    instanceEdit->setPlainText(instanceText);

    validate();
}
//! [2]

//! [3]
void MainWindow::validate()
{
    //按UTF8的格式 赋值内容给 QByteArray,const QByteArray schemaData = schemaView->toPlainText().toUtf8();
    const QByteArray instanceData = instanceEdit->toPlainText().toUtf8();

    MessageHandler messageHandler;

    //如果没猜错：这个就是XML格式分析错误用的
    QXmlSchema schema;
    schema.setMessageHandler(&messageHandler);
    //加载XML规则格式
    schema.load(schemaData);

    bool errorOccurred = false;
    if (!schema.isValid()) {
        errorOccurred = true;
    } else {
        QXmlSchemaValidator validator(schema);
        if (!validator.validate(instanceData))
            errorOccurred = true;
    }

    if (errorOccurred) {
        validationStatus->setText(messageHandler.statusMessage());
        moveCursor(messageHandler.line(),messageHandler.column());
    } else {
        validationStatus->setText(tr("validation successful"));
    }


    const QString styleSheet = QString("QLabel {background: %1; padding: 3px}")
                                      .arg(errorOccurred ? QColor(Qt::red).lighter(160).name() :
                                                           QColor(Qt::green).lighter(160).name());
    //更新样式
    validationStatus->setStyleSheet(styleSheet);
}
//! [3]

void MainWindow::textChanged()
{
    //设置选中行
    instanceEdit->setExtraSelections(QList<QTextEdit::ExtraSelection>());
}

void MainWindow::moveCursor(int line,int column)
{
    /**
     *有人会很觉得很奇怪为何没有明细选择数据那到那
     *其实代码是：光标在那，就设置那行的样式
     **/
    //moveCursor移动光标
    instanceEdit->moveCursor(QTextCursor::Start);
    for (int i = 1; i < line; ++i)
        instanceEdit->moveCursor(QTextCursor::Down);

    for (int i = 1; i < column; ++i)
        instanceEdit->moveCursor(QTextCursor::Right);

    //由于需要使用列表装载数据进行处理
    //定义控件中的额外选择项
    QList<QTextEdit::ExtraSelection> extraSelections;
    QTextEdit::ExtraSelection selection;

    //定义红色
    //设置属性集的背景色
    //设置属性集的长度
    //获取光标位置
    //清除选择行意义不明
    //添加的List容器
    const QColor lineColor = QColor(Qt::red).lighter(160);
    selection.format.setBackground(lineColor);
    selection.format.setProperty(QTextFormat::FullWidthSelection,true);
    selection.cursor = instanceEdit->textCursor();
    selection.cursor.clearSelection();
    extraSelections.append(selection);

    //更新选择内容
    instanceEdit->setExtraSelections(extraSelections);

    instanceEdit->setFocus();
}

按XML规则文件鉴别 XML的值内容正确否

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原文链接：https://www.f2er.com/xml/300578.html

【QT示例】XML Schema Validation Example

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