参考： 官网http://rapidxml.sourceforge.net/
https://blog.csdn.net/wqvbjhc/article/details/7662931
http://blog.sina.com.cn/s/blog_9b0604b40101o6fm.html

rapidxml_print.hpp修改代码：

#ifndef RAPIDXML_PRINT_HPP_INCLUDED#define RAPIDXML_PRINT_HPP_INCLUDED// Copyright (C) 2006, 2009 Marcin Kalicinski// Version 1.13// Revision $DateTime: 2009/05/13 01:46:17 $//! \file rapidxml_print.hpp This file contains rapidxml printer implementation#include "rapidxml.hpp"// Only include streams if not disabled#ifndef RAPIDXML_NO_STREAMS#include <ostream>#include <iterator>#endifnamespace rapidxml{///// Printing flagsconst int print_no_indenting = 0x1;   //!< Printer flag instructing the printer to suppress indenting of XML. See print() function.///// Internal//! \cond internalnamespace internal{///// Internal character operations// Copy characters from given range to given output iteratortemplate<class OutIt, class Ch>inline OutIt copy_chars(const Ch *begin, const Ch *end, OutIt out){while (begin != end)*out++ = *begin++;return out;}// Copy characters from given range to given output iterator and expand// characters into references (&lt; &gt; &apos; &quot; &amp;)template<class OutIt, class Ch>inline OutIt copy_and_expand_chars(const Ch *begin, const Ch *end, Ch noexpand, OutIt out){while (begin != end){if (*begin == noexpand){*out++ = *begin;    // No expansion, copy character}else{switch (*begin){case Ch('<'):*out++ = Ch('&'); *out++ = Ch('l'); *out++ = Ch('t'); *out++ = Ch(';');break;case Ch('>'): *out++ = Ch('&'); *out++ = Ch('g'); *out++ = Ch('t'); *out++ = Ch(';');break;case Ch('\''): *out++ = Ch('&'); *out++ = Ch('a'); *out++ = Ch('p'); *out++ = Ch('o'); *out++ = Ch('s'); *out++ = Ch(';');break;case Ch('"'): *out++ = Ch('&'); *out++ = Ch('q'); *out++ = Ch('u'); *out++ = Ch('o'); *out++ = Ch('t'); *out++ = Ch(';');break;case Ch('&'): *out++ = Ch('&'); *out++ = Ch('a'); *out++ = Ch('m'); *out++ = Ch('p'); *out++ = Ch(';'); break;default:*out++ = *begin;    // No expansion, copy character}}++begin;    // Step to next character}return out;}// Fill given output iterator with repetitions of the same charactertemplate<class OutIt, class Ch>inline OutIt fill_chars(OutIt out, int n, Ch ch){for (int i = 0; i < n; ++i)*out++ = ch;return out;}// Find charactertemplate<class Ch, Ch ch>inline bool find_char(const Ch *begin, const Ch *end){while (begin != end)if (*begin++ == ch)return true;return false;}///// Internal printing operationstemplate<class OutIt, class Ch>OutIt print_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);    template<class OutIt, class Ch>OutIt print_element_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);template<class OutIt, class Ch>OutIt print_data_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);template<class OutIt, class Ch>OutIt print_cdata_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);template<class OutIt, class Ch>OutIt print_declaration_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);template<class OutIt, class Ch>OutIt print_comment_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);template<class OutIt, class Ch>OutIt print_doctype_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);template<class OutIt, class Ch>OutIt print_pi_node(OutIt out, const xml_node<Ch> *node, int flags, int indent);// Print children of the node                               template<class OutIt, class Ch>inline OutIt print_children(OutIt out, const xml_node<Ch> *node, int flags, int indent){for (xml_node<Ch> *child = node->first_node(); child; child = child->next_sibling())out = print_node(out, child, flags, indent);return out;}// Print nodetemplate<class OutIt, class Ch>inline OutIt print_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){// Print proper node typeswitch (node->type()){// Documentcase node_document:out = print_children(out, node, flags, indent);break;// Elementcase node_element:out = print_element_node(out, node, flags, indent);break;// Datacase node_data:out = print_data_node(out, node, flags, indent);break;// CDATAcase node_cdata:out = print_cdata_node(out, node, flags, indent);break;// Declarationcase node_declaration:out = print_declaration_node(out, node, flags, indent);break;// Commentcase node_comment:out = print_comment_node(out, node, flags, indent);break;// Doctypecase node_doctype:out = print_doctype_node(out, node, flags, indent);break;// Picase node_pi:out = print_pi_node(out, node, flags, indent);break;// Unknowndefault:assert(0);break;}// If indenting not disabled, add line break after nodeif (!(flags & print_no_indenting))*out = Ch('\n'), ++out;// Return modified iteratorreturn out;}// Print attributes of the nodetemplate<class OutIt, class Ch>inline OutIt print_attributes(OutIt out, const xml_node<Ch> *node, int flags){for (xml_attribute<Ch> *attribute = node->first_attribute(); attribute; attribute = attribute->next_attribute()){if (attribute->name() && attribute->value()){// Print attribute name*out = Ch(' '), ++out;out = copy_chars(attribute->name(), attribute->name() + attribute->name_size(), out);*out = Ch('='), ++out;// Print attribute value using appropriate quote typeif (find_char<Ch, Ch('"')>(attribute->value(), attribute->value() + attribute->value_size())){*out = Ch('\''), ++out;out = copy_and_expand_chars(attribute->value(), attribute->value() + attribute->value_size(), Ch('"'), out);*out = Ch('\''), ++out;}else{*out = Ch('"'), ++out;out = copy_and_expand_chars(attribute->value(), attribute->value() + attribute->value_size(), Ch('\''), out);*out = Ch('"'), ++out;}}}return out;}// Print data nodetemplate<class OutIt, class Ch>inline OutIt print_data_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){assert(node->type() == node_data);if (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));out = copy_and_expand_chars(node->value(), node->value() + node->value_size(), Ch(0), out);return out;}// Print data nodetemplate<class OutIt, class Ch>inline OutIt print_cdata_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){assert(node->type() == node_cdata);if (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));*out = Ch('<'); ++out;*out = Ch('!'); ++out;*out = Ch('['); ++out;*out = Ch('C'); ++out;*out = Ch('D'); ++out;*out = Ch('A'); ++out;*out = Ch('T'); ++out;*out = Ch('A'); ++out;*out = Ch('['); ++out;out = copy_chars(node->value(), node->value() + node->value_size(), out);*out = Ch(']'); ++out;*out = Ch(']'); ++out;*out = Ch('>'); ++out;return out;}// Print element nodetemplate<class OutIt, class Ch>inline OutIt print_element_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){assert(node->type() == node_element);// Print element name and attributes, if anyif (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));*out = Ch('<'), ++out;out = copy_chars(node->name(), node->name() + node->name_size(), out);out = print_attributes(out, node, flags);// If node is childlessif (node->value_size() == 0 && !node->first_node()){// Print childless node tag ending*out = Ch('/'), ++out;*out = Ch('>'), ++out;}else{// Print normal node tag ending*out = Ch('>'), ++out;// Test if node contains a single data node only (and no other nodes)xml_node<Ch> *child = node->first_node();if (!child){// If node has no children, only print its value without indentingout = copy_and_expand_chars(node->value(), node->value() + node->value_size(), Ch(0), out);}else if (child->next_sibling() == 0 && child->type() == node_data){// If node has a sole data child, only print its value without indentingout = copy_and_expand_chars(child->value(), child->value() + child->value_size(), Ch(0), out);}else{// Print all children with full indentingif (!(flags & print_no_indenting))*out = Ch('\n'), ++out;out = print_children(out, node, flags, indent + 1);if (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));}// Print node end*out = Ch('<'), ++out;*out = Ch('/'), ++out;out = copy_chars(node->name(), node->name() + node->name_size(), out);*out = Ch('>'), ++out;}return out;}// Print declaration nodetemplate<class OutIt, class Ch>inline OutIt print_declaration_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){// Print declaration startif (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));*out = Ch('<'), ++out;*out = Ch('?'), ++out;*out = Ch('x'), ++out;*out = Ch('m'), ++out;*out = Ch('l'), ++out;// Print attributesout = print_attributes(out, node, flags);// Print declaration end*out = Ch('?'), ++out;*out = Ch('>'), ++out;return out;}// Print comment nodetemplate<class OutIt, class Ch>inline OutIt print_comment_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){assert(node->type() == node_comment);if (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));*out = Ch('<'), ++out;*out = Ch('!'), ++out;*out = Ch('-'), ++out;*out = Ch('-'), ++out;out = copy_chars(node->value(), node->value() + node->value_size(), out);*out = Ch('-'), ++out;*out = Ch('-'), ++out;*out = Ch('>'), ++out;return out;}// Print doctype nodetemplate<class OutIt, class Ch>inline OutIt print_doctype_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){assert(node->type() == node_doctype);if (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));*out = Ch('<'), ++out;*out = Ch('!'), ++out;*out = Ch('D'), ++out;*out = Ch('O'), ++out;*out = Ch('C'), ++out;*out = Ch('T'), ++out;*out = Ch('Y'), ++out;*out = Ch('P'), ++out;*out = Ch('E'), ++out;*out = Ch(' '), ++out;out = copy_chars(node->value(), node->value() + node->value_size(), out);*out = Ch('>'), ++out;return out;}// Print pi nodetemplate<class OutIt, class Ch>inline OutIt print_pi_node(OutIt out, const xml_node<Ch> *node, int flags, int indent){assert(node->type() == node_pi);if (!(flags & print_no_indenting))out = fill_chars(out, indent, Ch('\t'));*out = Ch('<'), ++out;*out = Ch('?'), ++out;out = copy_chars(node->name(), node->name() + node->name_size(), out);*out = Ch(' '), ++out;out = copy_chars(node->value(), node->value() + node->value_size(), out);*out = Ch('?'), ++out;*out = Ch('>'), ++out;return out;}}//! \endcond///// Printing//! Prints XML to given output iterator.//! \param out Output iterator to print to.//! \param node Node to be printed. Pass xml_document to print entire document.//! \param flags Flags controlling how XML is printed.//! \return Output iterator pointing to position immediately after last character of printed text.template<class OutIt, class Ch> inline OutIt print(OutIt out, const xml_node<Ch> &node, int flags = 0){return internal::print_node(out, &node, flags, 0);}#ifndef RAPIDXML_NO_STREAMS//! Prints XML to given output stream.//! \param out Output stream to print to.//! \param node Node to be printed. Pass xml_document to print entire document.//! \param flags Flags controlling how XML is printed.//! \return Output stream.template<class Ch> inline std::basic_ostream<Ch> &print(std::basic_ostream<Ch> &out, const xml_node<Ch> &node, int flags = 0){print(std::ostream_iterator<Ch>(out), node, flags);return out;}//! Prints formatted XML to given output stream. Uses default printing flags. Use print() function to customize printing process.//! \param out Output stream to print to.//! \param node Node to be printed.//! \return Output stream.template<class Ch> inline std::basic_ostream<Ch> &operator <<(std::basic_ostream<Ch> &out, const xml_node<Ch> &node){return print(out, node);}#endif}#endif

main.cpp

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <functional>
#include <memory>
#include <sstream>
using namespace std;//下面三个文件是本段代码需要的库文件
#include "rapidxml/rapidxml.hpp"
#include "rapidxml/rapidxml_utils.hpp"
#include "rapidxml/rapidxml_print.hpp"using namespace rapidxml;int CreateXml();
int ReadAndChangeXml();int main()
{CreateXml();ReadAndChangeXml();cout << "hello" << endl;return 0;
}
//创建一个名称为config.xml文件
int CreateXml()
{xml_document<> doc;  xml_node<>* rot = doc.allocate_node(rapidxml::node_pi,doc.allocate_string("xml version='1.0' encoding='utf-8'"));doc.append_node(rot);xml_node<>* node =   doc.allocate_node(node_element,"config","information");  xml_node<>* color =   doc.allocate_node(node_element,"color",NULL);  doc.append_node(node);node->append_node(color);color->append_node(doc.allocate_node(node_element,"red","0.1"));color->append_node(doc.allocate_node(node_element,"green","0.1"));color->append_node(doc.allocate_node(node_element,"blue","0.1"));color->append_node(doc.allocate_node(node_element,"alpha","1.0"));xml_node<>* size =   doc.allocate_node(node_element,"size",NULL); size->append_node(doc.allocate_node(node_element,"x","640"));size->append_node(doc.allocate_node(node_element,"y","480"));node->append_node(size);xml_node<>* mode = doc.allocate_node(rapidxml::node_element,"mode","screen mode");mode->append_attribute(doc.allocate_attribute("fullscreen","false"));node->append_node(mode);std::string text;  rapidxml::print(std::back_inserter(text), doc, 0);  std::cout<<text<<std::endl; std::ofstream out("config.xml");out << doc;
}//读取并修改config.xml
int ReadAndChangeXml()
{file<> fdoc("config.xml");std::cout<<fdoc.data()<<std::endl;xml_document<>   doc;doc.parse<0>(fdoc.data());std::cout<<doc.name()<<std::endl;//! 获取根节点rapidxml::xml_node<>* root = doc.first_node();std::cout<<root->name()<<std::endl;//! 获取根节点第一个节点rapidxml::xml_node<>* node1 = root->first_node();std::cout<<node1->name()<<std::endl;rapidxml::xml_node<>* node11 = node1->first_node();std::cout<<node11->name()<<std::endl;std::cout<<node11->value()<<std::endl;//! 添加之后再次保存//需要说明的是rapidxml明显有一个bug//那就是append_node(doc.allocate_node(node_element,"h","0"));的时候并不考虑该对象是否存在!xml_node<>* size = root->first_node("size");size->append_node(doc.allocate_node(node_element,"w","0"));size->append_node(doc.allocate_node(node_element,"h","0"));std::string text;rapidxml::print(std::back_inserter(text),doc,0);std::cout<<text<<std::endl;std::ofstream out("config.xml");out << doc;}

编译：
g++ main.cpp -std=gnu++0x