444963e269
There were two conditions under which xml_document::save_file could previously return true even though the saving failed: - The last write to the file was buffered in stdio buffer, and it's that last write that would fail due to lack of disk space - The data has been written correctly but fclose failed to update file metadata, which can result in truncated size / missing inode updates. This change fixes both by adjusting save_file to fflush before the check, and also checking fclose results. Note that while fflush here is technically redundant, because it's implied by fclose, we must check ferror explicitly anyway, and so it feels a little cleaner to do most of the error handling in save_file_impl, so that the changes of fclose() failing are very slim. Of course, neither change guarantees that the contents of the file are going to be safe on disk following a power failure.
pugixml 
pugixml is a C++ XML processing library, which consists of a DOM-like interface with rich traversal/modification capabilities, an extremely fast XML parser which constructs the DOM tree from an XML file/buffer, and an XPath 1.0 implementation for complex data-driven tree queries. Full Unicode support is also available, with Unicode interface variants and conversions between different Unicode encodings (which happen automatically during parsing/saving).
pugixml is used by a lot of projects, both open-source and proprietary, for performance and easy-to-use interface.
Documentation
Documentation for the current release of pugixml is available on-line as two separate documents:
- Quick-start guide, that aims to provide enough information to start using the library;
- Complete reference manual, that describes all features of the library in detail.
You’re advised to start with the quick-start guide; however, many important library features are either not described in it at all or only mentioned briefly; if you require more information you should read the complete manual.
Example
Here's an example of how code using pugixml looks; it opens an XML file, goes over all Tool nodes and prints tools that have a Timeout attribute greater than 0:
#include "pugixml.hpp"
#include <iostream>
int main()
{
pugi::xml_document doc;
pugi::xml_parse_result result = doc.load_file("xgconsole.xml");
if (!result)
return -1;
for (pugi::xml_node tool: doc.child("Profile").child("Tools").children("Tool"))
{
int timeout = tool.attribute("Timeout").as_int();
if (timeout > 0)
std::cout << "Tool " << tool.attribute("Filename").value() << " has timeout " << timeout << "\n";
}
}
And the same example using XPath:
#include "pugixml.hpp"
#include <iostream>
int main()
{
pugi::xml_document doc;
pugi::xml_parse_result result = doc.load_file("xgconsole.xml");
if (!result)
return -1;
pugi::xpath_node_set tools_with_timeout = doc.select_nodes("/Profile/Tools/Tool[@Timeout > 0]");
for (pugi::xpath_node node: tools_with_timeout)
{
pugi::xml_node tool = node.node();
std::cout << "Tool " << tool.attribute("Filename").value() <<
" has timeout " << tool.attribute("Timeout").as_int() << "\n";
}
}
License
This library is available to anybody free of charge, under the terms of MIT License (see LICENSE.md).