使用rapidxml操作xml~读写文件操作
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rapidxml~网上很容易下，下面介绍使用方法：
1、xml写文件 如下:
#include < iostream >
#include < rapidxml / rapidxml.hpp >
#include < rapidxml / rapidxml_utils.hpp >
#include < rapidxml / rapidxml_print.hpp >
using namespace rapidxml;
int main()
{
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;
system( " PAUSE " );
return EXIT_SUCCESS;
}
#include < rapidxml / rapidxml.hpp >
#include < rapidxml / rapidxml_utils.hpp >
#include < rapidxml / rapidxml_print.hpp >
using namespace rapidxml;
int main()
{
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;
system( " PAUSE " );
return EXIT_SUCCESS;
}
生成的xml文件为:
<?xml version='1.0' encoding='utf-8' ?><config> <color> <red>0.1</red> <green>0.1</green> <blue>0.1</blue> <alpha>1.0</alpha> </color> <size> <x>640</x> <y>480</y> </size> <mode fullscreen="false">screen mode</mode></config> 2、读xml文件
基本的步骤为
首先获取xml文件数据
然后分析数据
获取节点
获取属性
获取名字
获取值
...
代码如下:
#include < iostream >
#include < rapidxml / rapidxml.hpp >
#include < rapidxml / rapidxml_utils.hpp >
#include < rapidxml / rapidxml_print.hpp >
using namespace rapidxml;
int main()
{
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
xml_node<>* root = doc.first_node();
std::cout<<root->name()<<std::endl;
//! 获取根节点第一个节点
xml_node<>* node1 = root->first_node();
std::cout<<node1->name()<<std::endl;
xml_node<>* node11 = node1->first_node();
std::cout<<node11->name()<<std::endl;
std::cout<<node11->value()<<std::endl;
//! 修改之后再次保存
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;
system("PAUSE");
return EXIT_SUCCESS;
}
生成的xml为:
<? xml version='1.0' encoding='utf-8' ?>
< config >
< color >
< red > 0.1 </ red >
< green > 0.1 </ green >
< blue > 0.1 </ blue >
< alpha > 1.0 </ alpha >
</ color >
< size >
< x > 640 </ x >
< y > 480 </ y >
</ size >
< mode fullscreen ="false" > screen mode </ mode >
</ config >
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!
首先获取xml文件数据
然后分析数据
获取节点
获取属性
获取名字
获取值
...
代码如下:
#include < iostream > #include < rapidxml / rapidxml.hpp > #include < rapidxml / rapidxml_utils.hpp > #include < rapidxml / rapidxml_print.hpp > using namespace rapidxml; int main() { 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 xml_node<>* root = doc.first_node(); std::cout<<root->name()<<std::endl; //! 获取根节点第一个节点 xml_node<>* node1 = root->first_node(); std::cout<<node1->name()<<std::endl; xml_node<>* node11 = node1->first_node(); std::cout<<node11->name()<<std::endl; std::cout<<node11->value()<<std::endl; //! 修改之后再次保存 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; system("PAUSE"); return EXIT_SUCCESS;} <? xml version='1.0' encoding='utf-8' ?> < config > < color > < red > 0.1 </ red > < green > 0.1 </ green > < blue > 0.1 </ blue > < alpha > 1.0 </ alpha > </ color > < size > < x > 640 </ x > < y > 480 </ y > </ size > < mode fullscreen ="false" > screen mode </ mode > </ config > 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!
参考：
转载地址：http://hkwxi.baihongyu.com/
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