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Kenji Miyamoto
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 Posted: Fri Aug 08, 2008 3:05 pm Post subject: Qt4 and 'Plain' XPath (1.0) / libxml++ |
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I've noticed that the new Qt 4.4 has built-in support for XQuery and the like, but I haven't seen any simple examples for its XPath support. Using libxml++, I can just pass an XPath expression to a member function and it'll return a list of nodes, but I can't use it on the moment due to being on a Windows machine and the libxml++ install giving the MSVC R6304 error.
Can Qt4 do the same thing?
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Last edited by Kenji Miyamoto on Sat Aug 09, 2008 5:01 am; edited 1 time in total |
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Kenji Miyamoto
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Joined: 28 May 2005
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| Posted: Fri Aug 08, 2008 10:46 pm Post subject: |
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What I have now is a $document (a Wikipedia page) that prints out everything with the XQuery "doc($document)", but prints nothing with "doc($document)//div[@id='content']".
In XPath 1.0, "//div[@id='content']" prints out what I want.
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Alex Libman seems to be more of an anarchist than a libertarian. |
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Kenji Miyamoto
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Joined: 28 May 2005
Posts: 1452
Location: Looking over your shoulder.
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| Posted: Sat Aug 09, 2008 5:05 am Post subject: |
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Well, I've turned to libxml++, since it has built-in support for XPath, but I've run into an odd problem: | Code: | void QWikiWindow::set_text(QNetworkReply * fetch) {
QByteArray data = fetch->readAll();
QStringList tmp;
xmlpp::NodeSet::const_iterator i;
xmlpp::Node * root, * node, * subnode;
xmlpp::NodeSet nodes;
xmlpp::Document * subdoc;
this->ahref.clear();
try {
this->parser.parse_memory(Glib::ustring(data.data()));
if(this->parser) {
root = this->parser.get_document()->get_root_node();
// PAGE
node = root->find("id('content')").front();
subdoc = new xmlpp::Document;
subdoc->create_root_node_by_import(node);
this->page.setPlainText(QString::fromUtf8(subdoc->write_to_string_formatted().data()));
delete subdoc;
// LINKS
nodes = node->find("//p");
std::cout << "Length: " << nodes.size() << std::endl;
for(i = nodes.begin(); i != nodes.end(); ++i) {
std::cout << "PUT" << std::endl;
subnode = ((xmlpp::Element *)(*i))->get_child_text();
if(subnode) {
//std::cout << ((xmlpp::TextNode *)subnode)->get_content().raw() << std::endl;
tmp << QString::fromUtf8(((xmlpp::TextNode *)subnode)->get_content().data());
}
}
this->linkmodel.setStringList(tmp);
//nodes = node->find("//a[((parent::p or (parent::li and not(ancestor::table[@class='toc']) and not(ancestor::cite)))) and not(contains(@class, 'external')) and text() and not(contains(@href, 'Special'))]");
}
else {
errp("Parse failed.");
}
}
catch (xmlpp::parse_error e) {
std::cerr << "Exception caught: " << e.what() << std::endl;
}
} |
This is with a Wikipedia page supplied in data. The id('content') query works just fine, but any // queries for elements (such as //a) return nothing. Strangely, //@ queries for attributes (such as //@title) work just fine.
What's going on?
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Alex Libman seems to be more of an anarchist than a libertarian. |
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