config.xml文件内容：

    	
     		
      
       192.168.1.22
      		
      
       255.255.0.0
      		
      
       169.254.1.1
      		
      
       00:00:00:00:00:01
      	
     
    

譬如现在要修改ip节点值为169.254.1.20，代码如下

#include 
    
     #include "rapidxml/rapidxml.hpp"#include "rapidxml/rapidxml_utils.hpp"#include "rapidxml/rapidxml_print.hpp"int main(int argc,char **argv){	rapidxml::file<> file("config.xml");	rapidxml::xml_document<> doc;	//doc.parse<0>(file.data());	doc.parse
     
      (file.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;	rapidxml::xml_node<> *node = root->first_node("sys");	std::cout << node->name() << std::endl;	//char *str  = doc.allocate_string("192.168.1.20");	std::string str  = "169.254.1.20";	node->first_node("ip")->value(str.c_str());	std::cout << node->first_node("ip")->value() << std::endl;	std::string text;	rapidxml::print(std::back_inserter(text), doc, 0);	std::cout << text << std::endl;	std::ofstream out("config.xml");	out << doc;	return 0;}
     
    

很多人在修改在序列化xml时用

doc.parse<0>(file.data());

这个是无法修改值的。必须使用如下

doc.parse
    
     (file.data());
    

具体参加如下描述

Question：

Printing a document having a node with a modified value yields the wrong output. Example:

xml_document<char> doc;

doc.parse<0>(doc.allocate_string("<test>old</test>"));doc.first_node()->value(doc.allocate_string("new"));

rapidxml::print(cout, doc);

This will print "<test>old</test>" and not "<test>new</test>" as you would expect

Answer:

This is by design, although a little awkward.

The problem is that value of node is only a "shortcut" for the real data, which is stored in child data nodes of the node.

Child data nodes always take precedence over "value" of a node - to change the data you must do either one of the following:

- change the data in child data node(s), not in the value of parent node- tell parser that you do not want to have data nodes generated (parse_no_data_nodes), in which case you can just change the value

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