有的xml文件中内容是按属性方式写入的，格式示例如下所示：
<?xml version="1.0" standalone="yes" encoding="utf-8"?>
<FileRoot>
<Attr1 ip="192.168.0.1" timeout="123.456000"/>
<Attr2 ip="192.168.0.1" timeout="123.456000"/>
<Attr_1Floor>
<Attr1 name="Attr1" x="5" y="15" w="400" h="250"/>
<Attr2 name="Attr2" x="5" y="15" w="400" h="250"/>
</Attr_1Floor>
</FileRoot>针对这种格式的xml文件我们可以利用TiXmlAttribute属性进行遍历查找存储，具体实现细节如下：
1、首先我们针对Attr1属性里面的内容，我们可以采用_STL_1MAP_PARAM来存储，如下所示：
/*
<FileRoot>
<Attr1 ip="192.168.0.1" timeout="123.456000"/>
<Attr2 ip="192.168.0.1" timeout="123.456000"/>
</FileRoot>
*/
bool CTinyxmlEngine::Read_XML_1Floor_Attr(const char*pszPath,const char*pszNode,_STL_1MAP_PARAM&m_param)
{
TiXmlDocument doc(pszPath);
if (!doc.LoadFile())
{
return false;
}
const char*pszXmlName,*pszXmlValue;
TiXmlElement* p_root = doc.RootElement();
for (TiXmlNode*p_node = p_root->FirstChildElement();p_node;p_node=p_node->NextSiblingElement())
{
pszXmlName=p_node->Value();
if (strcmp(pszXmlName,pszNode)==0)
{
TiXmlElement*p_element = p_node->ToElement();
for (TiXmlAttribute*p_attribute = p_element->FirstAttribute();p_attribute;p_attribute=p_attribute->Next())
{
pszXmlName = p_attribute->Name();
pszXmlValue = p_attribute->Value();
if (NULL!=pszXmlValue)
{
m_param.v_param.push_back(pszXmlName);
m_param.m_param.insert(map<string,string>::value_type(pszXmlName,pszXmlValue));
}
}
break;
}
}
return true;
}同理，如果有多个类似Attr1的属性值存在的话，我们可以采用_STL_2MAP_PARAM参数进行存储，如下所示：
/*
<FileRoot>
<Attr1 ip="192.168.0.1" timeout="123.456000"/>
<Attr2 ip="192.168.0.1" timeout="123.456000"/>
</FileRoot>
*/
bool CTinyxmlEngine::Read_XML_2Floor_Attr(const char*pszPath,_STL_2MAP_PARAM&m_param)
{
TiXmlDocument doc(pszPath);
if (!doc.LoadFile())
{
return false;
}
const char*pszXmlName,*pszXmlValue,*pszXmlName1;
_STL_1MAP_PARAM m_param1;
TiXmlElement* p_root = doc.RootElement();
for (TiXmlNode* p_node=p_root->FirstChildElement();p_node;p_node=p_node->NextSiblingElement())
{
pszXmlName = p_node->Value();
if (pszXmlName!=NULL)
{
TiXmlElement* p_element = p_node->ToElement();
m_param1.m_param.clear();
m_param1.v_param.clear();
for (TiXmlAttribute* p_attribute=p_element->FirstAttribute();p_attribute;p_attribute=p_attribute->Next())
{
pszXmlName1 = p_attribute->Name();
pszXmlValue = p_attribute->Value();
if (pszXmlValue!=NULL)
{
m_param1.v_param.push_back(pszXmlName1);
m_param1.m_param.insert(make_pair(pszXmlName1,pszXmlValue));
}
}
if (!m_param1.v_param.empty())
{
m_param.v_param.push_back(pszXmlName);
m_param.m_param.insert(make_pair(pszXmlName,m_param1));
}
}
}
return true;
}扩展：我们可以读取多个上述节点，根据需要的节点来获取属性值，比如我们需要获取Attr_1Floor属性值，如下所示：
/*
<FileRoot>
<Attr_1Floor>
<Attr1 name="Attr1" x="5" y="15" w="400" h="250"/>
<Attr2 name="Attr2" x="5" y="15" w="400" h="250"/>
</Attr_1Floor>
</FileRoot>
*/
bool CTinyxmlEngine::Read_XML_2Floor_Attr(const char*pszPath,const char*pszNode,_STL_2MAP_PARAM&m_param)
{
TiXmlDocument doc(pszPath);
if (!doc.LoadFile())
{
return false;
}
const char*pszXmlName,*pszXmlValue,*pszXmlName1;
_STL_1MAP_PARAM m_param1;
TiXmlElement* p_root = doc.RootElement();
for (TiXmlNode*p_node = p_root->FirstChildElement();p_node;p_node=p_node->NextSiblingElement())
{
pszXmlName = p_node->Value();
if (strcmp(pszXmlName,pszNode)==0)
{
TiXmlElement*p_element = p_node->ToElement();
for (TiXmlNode*p_node = p_element->FirstChildElement();p_node;p_node = p_node->NextSiblingElement())
{
pszXmlName=p_node->Value();
TiXmlElement*p_element = p_node->ToElement();
m_param1.m_param.clear();
m_param1.v_param.clear();
for (TiXmlAttribute*p_attribute = p_element->FirstAttribute();p_attribute;p_attribute=p_attribute->Next())
{
pszXmlName1 = p_attribute->Name();
pszXmlValue = p_attribute->Value();
if (NULL!=pszXmlValue)
{
m_param1.v_param.push_back(pszXmlName1);
m_param1.m_param.insert(map<string,string>::value_type(pszXmlName1,pszXmlValue));
}
}
m_param.v_param.push_back(pszXmlName);
m_param.m_param.insert(map<string,_STL_1MAP_PARAM>::value_type(pszXmlName,m_param1));
}
break;
}
}
return true;
}函数示例调用如下：
#include <iostream>
#include <string>
#include "TinyxmlEngine.h"
using namespace std;
void Print_m_param1(_STL_1MAP_PARAM m_param1)
{
vector<string>::iterator it = m_param1.v_param.begin();
for (;it!=m_param1.v_param.end();++it)
{
cout<<" "<<*it<<": "<<m_param1.m_param[*it]<<endl;
}
cout<<"================================"<<endl;
}
void Print_m_param2(_STL_2MAP_PARAM m_param2)
{
vector<string>::iterator it = m_param2.v_param.begin();
for (;it!=m_param2.v_param.end();++it)
{
cout<<*it<<":"<<endl;
_STL_1MAP_PARAM m_param1 = m_param2.m_param[*it];
vector<string>::iterator it1 = m_param1.v_param.begin();
for (;it1!=m_param1.v_param.end();++it1)
{
cout<<" "<<*it1<<": "<<m_param1.m_param[*it1]<<endl;
}
cout<<"================================"<<endl;
}
}
void Print_m_param3(_STL_3MAP_PARAM m_param3)
{
vector<string>::iterator it = m_param3.v_param.begin();
for (;it!=m_param3.v_param.end();++it)
{
cout<<*it<<":"<<endl;
_STL_2MAP_PARAM m_param2;
m_param2 = m_param3.m_param[*it];
vector<string>::iterator it = m_param2.v_param.begin();
for (;it!=m_param2.v_param.end();++it)
{
cout<<" "<<*it<<":"<<endl;
_STL_1MAP_PARAM m_param1 = m_param2.m_param[*it];
vector<string>::iterator it1 = m_param1.v_param.begin();
for (;it1!=m_param1.v_param.end();++it1)
{
cout<<" "<<*it1<<": "<<m_param1.m_param[*it1]<<endl;
}
}
cout<<"================================"<<endl;
}
}
int main()
{
CTinyxmlEngine m_engine;
_STL_1MAP_PARAM m_param1;
m_engine.Read_XML_1Floor_Attr("Attr.xml","Attr1",m_param1);
Print_m_param1(m_param1);
_STL_2MAP_PARAM m_param2;
m_engine.Read_XML_2Floor_Attr("Attr.xml",m_param2);
Print_m_param2(m_param2);
m_engine.Erase_Param_2AMP(m_param2);
m_engine.Read_XML_2Floor_Attr("Attr.xml","Attr_1Floor",m_param2);
Print_m_param2(m_param2);
return 0;
}运行结果：
至此，根据Tinyxml读取xml的text内容及attribute属性操作都描述完成了，在实际的应用过程中，两种文本写入方式往往会结合使用，这就需要我们根据不同的场景需求进行相应的遍历读取，接下来讲讲文本及属性的xml写入