int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QFile file("../myXmlStream/my.xml");
if (!file.open(QFile::ReadOnly | QFile::Text))
{
qDebug()<<"Error: cannot open file";
return 1;
}
QXmlStreamReader reader;
// 设置文件，这时会将流设置为初始状态
reader.setDevice(&file);
// 如果没有读到文档结尾，而且没有出现错误
while (!reader.atEnd()) {
// 读取下一个记号，它返回记号的类型
QXmlStreamReader::TokenType type = reader.readNext();
// 下面便根据记号的类型来进行不同的输出
if (type == QXmlStreamReader::StartDocument)
qDebug() << reader.documentEncoding() << reader.documentVersion();
if (type == QXmlStreamReader::StartElement) {
qDebug() << "<" << reader.name() << ">";
if (reader.attributes().hasAttribute("id"))
qDebug() << reader.attributes().value("id");
}
if (type == QXmlStreamReader::EndElement)
qDebug() << "</" << reader.name() << ">";
if (type == QXmlStreamReader::Characters && !reader.isWhitespace())
qDebug() << reader.text();
}
// 如果读取过程中出现错误，那么输出错误信息
if (reader.hasError()) {
qDebug() << "error: " << reader.errorString();
}
file.close();
return a.exec();
}
/* private self */
QMap<QString, QString> XMLerLoadFileThread::getInformationFromFile ( )
{
QMap<QString, QString> result;
QFile xml_file( fileName() );
if ( !xml_file.exists() ) {
emit error ( tr("File %1 does not exist.").arg( fileName() ) );
return result;
}
if ( !xml_file.open ( QIODevice::ReadOnly | QIODevice::Text ) ) {
emit error ( tr("Can not open file %1.").arg( fileName() ) );
return result;
}
QString encoding;
QString version;
QXmlStreamReader reader ( &xml_file );
while ( !reader.atEnd() ) {
QXmlStreamReader::TokenType tt = reader.readNext();
if ( tt == QXmlStreamReader::StartDocument ) {
encoding = reader.documentEncoding().toString();
version = reader.documentVersion().toString();
break;
}
}
if ( !encoding.isEmpty() )
result.insert("encoding", encoding);
if ( !version.isEmpty() )
result.insert("version", version);
xml_file.close();
return result;
}
/**
* @brief Convert an XML stream to a hierarchical QVariantMap.
*
* This function is used internally to embed opaque XML structures, such as the
* SQS service's ErrorResponse::Error::Detail, which the SQS schema defines as
* an arbitrary complex type.
*
* @note This static function exists within the AwsAbstractResponse for
* historic reasons. It should probably be moved our of this class, and
* into a more generic utility space at some point.
*
* @param xml XML stream to convert.
* @param prefix Prefix to apply to special (non-element) child entry names.
* @param maxDepth Maximum depth to traverse before truncating the tree.
*
* @return A QVariantMap representing the \a xml XML fragment.
*
* @todo Move this toVariant function to somewhere more generic.
*/
QVariantMap AwsAbstractResponse::toVariant(
QXmlStreamReader &xml, const QString &prefix, const int maxDepth)
{
if (maxDepth < 0) {
qWarning() << QObject::tr("max depth exceeded");
return QVariantMap();
}
if (xml.hasError()) {
qWarning() << xml.errorString();
return QVariantMap();
}
if (xml.tokenType() == QXmlStreamReader::NoToken)
xml.readNext();
if ((xml.tokenType() != QXmlStreamReader::StartDocument) &&
(xml.tokenType() != QXmlStreamReader::StartElement)) {
qWarning() << QObject::tr("unexpected XML tokenType %1 (%2)")
.arg(xml.tokenString()).arg(xml.tokenType());
return QVariantMap();
}
QVariantMap map;
if (xml.tokenType() == QXmlStreamReader::StartDocument) {
map.insert(prefix + QLatin1String("DocumentEncoding"), xml.documentEncoding().toString());
map.insert(prefix + QLatin1String("DocumentVersion"), xml.documentVersion().toString());
map.insert(prefix + QLatin1String("StandaloneDocument"), xml.isStandaloneDocument());
} else {
if (!xml.namespaceUri().isEmpty())
map.insert(prefix + QLatin1String("NamespaceUri"), xml.namespaceUri().toString());
foreach (const QXmlStreamAttribute &attribute, xml.attributes()) {
QVariantMap attributeMap;
attributeMap.insert(QLatin1String("Value"), attribute.value().toString());
if (!attribute.namespaceUri().isEmpty())
attributeMap.insert(QLatin1String("NamespaceUri"), attribute.namespaceUri().toString());
if (!attribute.prefix().isEmpty())
attributeMap.insert(QLatin1String("Prefix"), attribute.prefix().toString());
attributeMap.insert(QLatin1String("QualifiedName"), attribute.qualifiedName().toString());
map.insertMulti(prefix + attribute.name().toString(), attributeMap);
}
}
for (xml.readNext(); (!xml.atEnd()) && (xml.tokenType() != QXmlStreamReader::EndElement)
&& (xml.tokenType() != QXmlStreamReader::EndDocument); xml.readNext()) {
switch (xml.tokenType()) {
case QXmlStreamReader::Characters:
case QXmlStreamReader::Comment:
case QXmlStreamReader::DTD:
case QXmlStreamReader::EntityReference:
map.insertMulti(prefix + xml.tokenString(), xml.text().toString());
break;
case QXmlStreamReader::ProcessingInstruction:
map.insertMulti(prefix + xml.processingInstructionTarget().toString(),
xml.processingInstructionData().toString());
break;
case QXmlStreamReader::StartElement: {
const QString elementName = xml.name().toString();
map.insertMulti(elementName, toVariant(xml, prefix, maxDepth-1));
break;
}
default:
qWarning() << QObject::tr("unexpected XML tokenType %1 (%2)")
.arg(xml.tokenString()).arg(xml.tokenType());
}
}
return map;
}
bool
DirectParser::Read (DirectMessage & msg)
{
msg.Clear ();
if (!bufLock.tryLock (5000)) {
qDebug () << "WARNING: Mutex locked 5 seconds, giving up";
return false;
}
QXmlStreamReader xread (&inbuf);
QXmlStreamReader::TokenType tokt;
bool finished (false);
bool complete (false);
bool good (false);
bool badData (false);
QString topname;
QString bottomtag;
QString version;
qint64 offset (0);
while (!finished) {
tokt = ReadNext (xread);
offset = xread.characterOffset ();
qDebug () << " Direct token " << xread.tokenString();
switch (tokt) {
case QXmlStreamReader::NoToken :
qDebug () << " no token found";
finished = true; complete = false; good = false;
lastErr = Proto_EmptyInput;
break;
case QXmlStreamReader::Invalid :
qDebug () << " bad token";
qDebug () << " text until here: " << inbuf.buffer().left(offset);
finished = true; complete = false; good = false;
lastErr = Proto_BadTag;
badData = true;
break;
case QXmlStreamReader::StartElement:
topname = xread.name().toString().toLower();
if (topname == oldTopTag) {
ParseOld (xread, msg, offset, complete, good);
msg.SetAttribute ("version","0.1");
} else if (topname == topTag) {
version = xread.documentVersion ().toString();
msg.SetAttribute ("version",version);
ParseMessage (xread, msg, offset, complete, good);
} else {
qDebug () << " topname unknown: " << topname;
finished = true; complete = false; good = false;
lastErr = Proto_WrongProtocol;
}
break;
case QXmlStreamReader::EndElement:
bottomtag = xread.name().toString().toLower();
if (bottomtag == topname) {
finished = true;
}
break;
case QXmlStreamReader::EndDocument :
finished = true;
break;
case QXmlStreamReader::Characters:
break;
case QXmlStreamReader::StartDocument:
case QXmlStreamReader::Comment:
case QXmlStreamReader::DTD:
case QXmlStreamReader::EntityReference:
case QXmlStreamReader::ProcessingInstruction:
break;
default:
qDebug () << " unknown token type " << tokt;
lastErr = Proto_Unknown;
finished = true; complete = false; good = false;
break;
}
}
if (good && complete) {
/// we have consumed a message, so get rid of the raw data
/// so we can read the next message next time
qDebug () << " trailing token " << xread.tokenString ();
while (!xread.atEnd() && xread.tokenType() != QXmlStreamReader::EndDocument) {
xread.readNext();
qDebug () << " consumed " << xread.tokenString ();
}
qDebug () << " remove " << offset << " bytes from buffer: ";
qDebug () << inbuf.buffer().left(offset);
inbuf.buffer().remove (0,offset+1);
inbuf.seek (0);
} else {
msg.Clear ();
}
qDebug () << " after DirectParser::Read buffer has [[" << inbuf.buffer() << "]]";
qDebug () << " token " << xread.tokenString() << " error " << xread.error();
if (!good) {
if (xread.error () == QXmlStreamReader::PrematureEndOfDocumentError) {
complete = false;
good = true;
}
}
lastComplete = complete;
lastGood = good;
bufLock.unlock ();
return good && complete;
}