qt-everywhere-src-5.15.1/qtxmlpatterns/src/xmlpatterns/doc/snippets/qxmlschemavalidator/main.cpp

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#include <QtCore>
#include <QtXmlPatterns>

class SchemaValidator
{
    public:
        void validateFromUrl() const;
        void validateFromFile() const;
        void validateFromData() const;
        void validateComplete() const;

    private:
        QXmlSchema getSchema() const;
};

void SchemaValidator::validateFromUrl() const
{
//! [0]
    const QXmlSchema schema = getSchema();

    const QUrl url("http://www.schema-example.org/test.xml");

    QXmlSchemaValidator validator(schema);
    if (validator.validate(url))
        qDebug() << "instance document is valid";
    else
        qDebug() << "instance document is invalid";
//! [0]
}

void SchemaValidator::validateFromFile() const
{
//! [1]
    const QXmlSchema schema = getSchema();

    QFile file("test.xml");
    file.open(QIODevice::ReadOnly);

    QXmlSchemaValidator validator(schema);
    if (validator.validate(&file, QUrl::fromLocalFile(file.fileName())))
        qDebug() << "instance document is valid";
    else
        qDebug() << "instance document is invalid";
//! [1]
}

void SchemaValidator::validateFromData() const
{
//! [2]
    const QXmlSchema schema = getSchema();

    QByteArray data("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
                    "<test></test>");

    QBuffer buffer(&data);
    buffer.open(QIODevice::ReadOnly);

    QXmlSchemaValidator validator(schema);
    if (validator.validate(&buffer))
        qDebug() << "instance document is valid";
    else
        qDebug() << "instance document is invalid";
//! [2]
}

QXmlSchema SchemaValidator::getSchema() const
{
    QByteArray data("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
                    "<xsd:schema"
                    "        xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
                    "        xmlns=\"http://www.qt-project.org/xmlschematest\""
                    "        targetNamespace=\"http://www.qt-project.org/xmlschematest\""
                    "        version=\"1.0\""
                    "        elementFormDefault=\"qualified\">"
                    "</xsd:schema>");

    QBuffer buffer(&data);
    buffer.open(QIODevice::ReadOnly);

    QXmlSchema schema;
    schema.load(&buffer);

    return schema;
}

void SchemaValidator::validateComplete() const
{
//! [3]
    QUrl schemaUrl("file:///home/user/schema.xsd");

    QXmlSchema schema;
    schema.load(schemaUrl);

    if (schema.isValid()) {
        QFile file("test.xml");
        file.open(QIODevice::ReadOnly);

        QXmlSchemaValidator validator(schema);
        if (validator.validate(&file, QUrl::fromLocalFile(file.fileName())))
            qDebug() << "instance document is valid";
        else
            qDebug() << "instance document is invalid";
    }
//! [3]
}

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);

    SchemaValidator validator;

    validator.validateFromUrl();
    validator.validateFromFile();
    validator.validateFromData();
    validator.validateComplete();

    return 0;
}