大家好，又见面了，我是你们的朋友全栈君。
一、写xml 文件
#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; }
生成的xml例如以下：
<?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>
写文件样例2：
#include <string> #include <iostream> #include <fstream> #include "rapidxml/rapidxml.hpp" #include "rapidxml/rapidxml_utils.hpp" #include "rapidxml/rapidxml_print.hpp" using namespace rapidxml; using namespace std; int main(int argc, char* argv[]) { xml_document<> doc; //是解析器 char a[] = "<top>"//假设单独传, 就不能加上xml的头部信息， //否则会报错 "<name>tangqiang</name>" "<age>22</age>" "</top>"; char* p = a; doc.parse<0>(p); xml_node<>* node = doc.first_node();//去顶级结点 cout << (node->name())<< endl; node = node->first_node(); while (node) { cout << node->name() << node->value() << endl;//name() value()返回的字符串不会去掉首尾的空白字符 node = node->next_sibling(); } ofstream out("test.xml");//ofstream 默认时，假设文件存在则会覆盖原来的内容，不存在则会新建 out << doc;//doc 这样输出时在目标文件里不会有xml 头信息---<?xml version='1.0' encoding='utf-8' > out.close(); system("pause"); return 0; }
生成的xml例如以下：
<top>
<name>tangqiang</name>
<age>22</age>
</top>
二、读取xml文件
#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; //! 加入之后再次保存 //须要说明的是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; system("PAUSE"); return EXIT_SUCCESS; }
生成的xml为：
<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>
<w>0</w>
<h>0</h>
</size>
<mode fullscreen="false">screen mode</mode>
</config>
三、删除节点
#include "rapidxml/rapidxml.hpp" #include "rapidxml/rapidxml_utils.hpp" #include "rapidxml/rapidxml_print.hpp" #include<iostream> using namespace rapidxml; int main() { file<> fdoc("config.xml"); xml_document<> doc; doc.parse<0>(fdoc.data()); std::string text; rapidxml::print(std::back_inserter(text), doc, 0); std::cout<<text<<std::endl; xml_node<>* root = doc.first_node(); xml_node<>* sec = root->first_node(); root->remove_node(sec); //移除根节点下的sec结点(包含该结点下全部结点) text="删除一个节点\r\n"; rapidxml::print(std::back_inserter(text), doc, 0); std::cout<<text<<std::endl; root->remove_all_nodes(); //移除根节点下全部结点 text="删除全部节点\r\n"; rapidxml::print(std::back_inserter(text), doc, 0); std::cout<<text<<std::endl; std::ofstream out("test.xml"); out<<doc; system("pause"); return 0; }
输出信息例如以下：
<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>
<w>0</w>
<h>0</h>
</size>
<mode fullscreen="false">screen mode</mode>
</config>
删除一个节点
<config>
<size>
<x>640</x>
<y>480</y>
<w>0</w>
<h>0</h>
</size>
<mode fullscreen="false">screen mode</mode>
</config>
删除全部节点
<config/>
四、编辑节点信息
临时找到的编辑方法就是先删除再添加
#include "rapidxml/rapidxml.hpp" #include "rapidxml/rapidxml_utils.hpp" #include "rapidxml/rapidxml_print.hpp" #include<iostream> 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(); xml_node<>* delnode = root->first_node("color"); root->remove_node(delnode);//先删除address节点 // xml_node<>* lnode = root->first_node("size");//找到post节点 xml_node<>* mynode=doc.allocate_node(node_element,"address","河北"); root->insert_node(lnode,mynode); std::string text; rapidxml::print(std::back_inserter(text),doc,0); std::cout<<text<<std::endl; std::ofstream out("version.xml"); out << doc; system("pause"); return 0; }
输出例如以下： <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> <w>0</w> <h>0</h> </size> <mode fullscreen="false">screen mode</mode> </config> <config> <address>河北</address> <size> <x>640</x> <y>480</y> <w>0</w> <h>0</h> </size> <mode fullscreen="false">screen mode</mode> </config>
五、遍历全部节点
for(rapidxml::xml_node<char> * node = parent_node->first_node("node name"); node != NULL; node = node->next_sibling()) { //TO DO }
六、遍历全部属性
for(rapidxml::xml_attribute<char> * attr = node->first_attribute("node name"); attr != NULL; attr = attr->next_attribute()) { char * value = attr->value(); }
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