I parse a document and want to retrieve part of the XML tree as string. The document (example):
<?xml version="1.0"?> <MyConfig> <MyData> <Foo bar="baz>42</Foo> </MyData> <OtherData>Something</OtherData> </MyConfig> The code:
pugi::xml_document doc; doc.load_file(documentFileName); pugi::xml_node root = doc.child("MyConfig"); // parse custom data _customData = root.child("MyData"). <-- HOW TO GET INNER XML? Expected contents of custom data (if formatting is lost, I don't mind):
"<Foo bar="baz>42</Foo>" How to do this?
2 Answers
I found a solution directly in the docs, it's just that google does not index them well, so I had to look it up manually. My solution was to use pugi::xml_writer and node.print. In the docs, they even already show an implementation for std::string:
struct xml_string_writer: pugi::xml_writer { std::string result; virtual void write(const void* data, size_t size) { result.append(static_cast<const char*>(data), size); } }; With that available, I just made a convenience function to merge XML of all child nodes:
std::string InnerXML(pugi::xml_node target) { xml_string_writer writer; for (pugi::xml_node child = target.first_child(); child; child = child.next_sibling()) child.print(writer, ""); return writer.result; } I think pugi::xml_node::print() is a way.
pugi::xml_node node = root.child("MyData"); pugi::xml_node child = node.first_child(); std::stringstream ss; child.print(ss); std::string s = ss.str(); The trouble is that s will now have value
<Foo bar="baz>42</Foo> </MyData> <OtherData>Something</OtherData> > </MyConfig>" /> - It's the textual tree from the node onwards, and;
- It's messy with html escape sequences rather than
<and>
Not ideal, but these can obviously be solved with some string manipulation.
// replace < with < size_t off = 0; while ((off = s.find("<", off)) != s.npos) s.replace(off, 4, "<"); // replace > with > off = 0; while ((off = s.find(">", off)) != s.npos) s.replace(off, 4, ">"); // truncate at the closing tag size_t end_open = s.find(">", 0); size_t end_close = s.find(">", end_open + 1); s = s.substr(0, end_close + 1); Which will lead to s having value
<Foo bar="baz>42</Foo> 
