解析Qt中
问题描述:
一个XML文件,比方说,我有一个这样的XML文件:解析Qt中
<?xml version="1.0" encoding="utf-8"?>
<name>
<id>1</id>
</name>
我如何分析它,并得到id
价值?
std::string id = ...;
答
像这样将工作:
xmlFile = new QFile("xmlFile.xml");
if (!xmlFile->open(QIODevice::ReadOnly | QIODevice::Text)) {
QMessageBox::critical(this,"Load XML File Problem",
"Couldn't open xmlfile.xml to load settings for download",
QMessageBox::Ok);
return;
}
xmlReader = new QXmlStreamReader(xmlFile);
//Parse the XML until we reach end of it
while(!xmlReader->atEnd() && !xmlReader->hasError()) {
// Read next element
QXmlStreamReader::TokenType token = xmlReader->readNext();
//If token is just StartDocument - go to next
if(token == QXmlStreamReader::StartDocument) {
continue;
}
//If token is StartElement - read it
if(token == QXmlStreamReader::StartElement) {
if(xmlReader->name() == "name") {
continue;
}
if(xmlReader->name() == "id") {
qDebug() << xmlReader->readElementText();
}
}
}
if(xmlReader->hasError()) {
QMessageBox::critical(this,
"xmlFile.xml Parse Error",xmlReader->errorString(),
QMessageBox::Ok);
return;
}
//close reader and flush file
xmlReader->clear();
xmlFile->close();
答
我做了@书士的回答的简化版本。而不是从文件中读取我刚从一个QString的可变的读取和我删除了continue;
块:
QString xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
"<name>\n"
" <id>1</id>\n"
"</name>\n";
QXmlStreamReader reader(xml);
while(!reader.atEnd() && !reader.hasError()) {
if(reader.readNext() == QXmlStreamReader::StartElement && reader.name() == "id") {
qDebug() << reader.readElementText();
}
}
我没有看到这里的任何XML .. – liaK 2010-06-22 11:01:26
谷歌提供此链接:http://www.digitalfanatics.org/项目/ qt_tutorial/chapter09.html。这对你有帮助吗? – stefaanv 2010-06-22 11:18:45