<xml>
* 方法和json类似，从 sourceforge.net/projects/tinyxml 下载源文件解压
* 在vs工程属性中 configuration properties -> C/C++ -> general -> additional include directories 添加 tinyxml.h的路径
* 然后再工程目录下新建一个filter，命名xml，添加解压出来的文件的 .cpp / .h 六个文件（除了xxxtest.cpp,因为是测试文件，里面有main函数），
* 其中.cpp 文件的预编译头属性precompiled header设置成no,
* 在主函数中加入头文件引用即可
#include "tinystr.h"
#include "tinyxml.h"
//读取在工程目录中的文件demotest.xml
TiXmlDocument doc("demotest.xml");
doc.Parse(demoStart);
if (doc.Error())//读取失败
{
printf("Error in %s: %s\n", doc.Value(), doc.ErrorDesc());
exit(1);
}
doc.SaveFile();
bool loadOkay = doc.LoadFile();
if (!loadOkay)
{
printf("Could not load test file 'demotest.xml'. Error='%s'. Exiting.\n", doc.ErrorDesc());
exit(1);
}
//两种输出方式，结果看起来都差不多，整体打印出来
printf("** Demo doc read from disk: ** \n\n");
printf("** Printing via doc.Print **\n");
doc.Print(stdout);
printf("\n\n\n** Printing via TiXmlPrinter **\n\n");
TiXmlPrinter printer;
doc.Accept(&printer);
fprintf(stdout, "%s", printer.CStr());
//根据节点修改属性
// --------------------------------------------------------
// An example of changing existing attributes, and removing
// an element from the document.
// --------------------------------------------------------
TiXmlNode* node = 0;
TiXmlElement* todoElement = 0;
TiXmlElement* itemElement = 0;
// Get the "ToDo" element.
// It is a child of the document, and can be selected by name.
node = doc.FirstChild( "ToDo" );
assert( node );
todoElement = node->ToElement();
assert( todoElement );
// Going to the toy store is now our second priority...
// So set the "priority" attribute of the first item in the list.
node = todoElement->FirstChildElement(); // This skips the "PDA" comment.
assert( node );
itemElement = node->ToElement();
assert( itemElement );
itemElement->SetAttribute( "priority", 2 );
// Change the distance to "doing bills" from
// "none" to "here". It's the next sibling element.
itemElement = itemElement->NextSiblingElement();
assert( itemElement );
itemElement->SetAttribute( "distance", "here" );
// Remove the "Look for Evil Dinosaurs!" item.
// It is 1 more sibling away. We ask the parent to remove
// a particular child.
itemElement = itemElement->NextSiblingElement();
todoElement->RemoveChild( itemElement );
itemElement = 0;
// --------------------------------------------------------
// What follows is an example of created elements and text
// nodes and adding them to the document.
// --------------------------------------------------------
//添加属性及字段
// Add some meetings.
TiXmlElement item( "Item" );
item.SetAttribute( "priority", "1" );
item.SetAttribute( "distance", "far" );
TiXmlText text( "Talk to:" );
TiXmlElement meeting1( "Meeting" );
meeting1.SetAttribute( "where", "School" );
TiXmlElement meeting2( "Meeting" );
meeting2.SetAttribute( "where", "Lunch" );
TiXmlElement attendee1( "Attendee" );
attendee1.SetAttribute( "name", "Marple" );
attendee1.SetAttribute( "position", "teacher" );
TiXmlElement attendee2( "Attendee" );
attendee2.SetAttribute( "name", "Voel" );
attendee2.SetAttribute( "position", "counselor" );
//指定层级结构
// Assemble the nodes we've created:
meeting1.InsertEndChild( attendee1 );
meeting1.InsertEndChild( attendee2 );
item.InsertEndChild( text );
item.InsertEndChild( meeting1 );
item.InsertEndChild( meeting2 );
// And add the node to the existing list after the first child.
node = todoElement->FirstChild( "Item" );
assert( node );
itemElement = node->ToElement();
assert( itemElement );
todoElement->InsertAfterChild( itemElement, item );
//打印
printf( "\n** Demo doc processed: ** \n\n" );
doc.Print( stdout );
//前后对比
//------ origin
<?xml version="1.0" standalone="no" ?>
<!-- Our to do list data -->
<ToDo>
<!-- Do I need a secure PDA? -->
<Item priority="1" distance="close">
Go to the
<bold>Toy store!</bold>
</Item>
<Item priority="2" distance="none">Do bills</Item>
<Item priority="2" distance="far & back">Look for Evil Dinosaurs!</Item>
</ToDo>
//------ after
<?xml version="1.0" standalone="no" ?>
<!-- Our to do list data -->
<ToDo>
<!-- Do I need a secure PDA? -->
<Item priority="2" distance="close">Go to the
<bold>Toy store!</bold>
</Item>
<Item priority="1" distance="far">Talk to:
<Meeting where="School">
<Attendee name="Marple" position="teacher" />
<Attendee name="Voel" position="counselor" />
</Meeting>
<Meeting where="Lunch" />
</Item>
<Item priority="2" distance="here">Do bills</Item>
</ToDo>避免 XML 属性？
因使用属性而引起的一些问题：
属性无法包含多重的值（元素可以）
属性无法描述树结构（元素可以）
属性不易扩展（为未来的变化）
属性难以阅读和维护
请尽量使用元素来描述数据。而仅仅使用属性来提供与数据无关的信息。
不要做这样的蠢事（这不是 XML 应该被使用的方式）：
<note day="08" month="08" year="2008"
to="George" from="John" heading="Reminder"
body="Don't forget the meeting!">
</note>
////////////////////////////////////
xml
https://www.cnblogs.com/xudong-bupt/p/3733306.html
**https://www.cnblogs.com/betterwgo/p/7895891.html
