Use boost to read XML files detailing _c language

Boost reads XML file

Boost provides support for configuration file reads: Property_tree.

Basic_ptree is the core foundation of Property_tree. Its interface is like Std::list. You can perform a number of basic element operations, such as using begin (), End (), and so on.
Additional operations such as Get (), Get_child (), Get_value (), data () of the operation attribute tree are also added.

Basic_ptree has two important internal definitions of self_type and value_type. Self_type is the type of the Basic_ptree template after it is instantiated, and it is also a child node type. Value_type is the data structure of a node, which is an std::p air, which contains the property name (a) and the node itself (second).

Typically, instead of using Basic_ptree, you use a predefined typedef. Ptree, Wptree, Iptree, Wiptree. Prefix I indicates that case is ignored, and prefix w indicates support for wide characters.

For example:

Config.xml

<?xml version= "1.0" encoding= "Utf-8"?> 
<con> 
 <id>1</id> 
 <name>fansy </name> 
 <urls> 
  <url>http://blog.csdn.net//fansongy</url> 
  <url>http:/ /weibo.com//fansongy</url> 
 </urls> 
</con>  

I want to read its data:

#include <iostream> #include <boost/property_tree/ptree.hpp> #include <boost/property_tree/xml_ 
Parser.hpp> #include <boost/typeof/typeof.hpp> using namespace std; 
Using namespace boost::p roperty_tree; 
  int main () {Ptree pt;   Read_xml ("Conf.xml", PT); Read an XML file cout<< "ID is" <<pt.get<int> ("Con.id") <<endl; Read the information in the node cout<< "Try Default" <<pt.get<int> ("Con.no_prop" <<endl;  If not, the default value is used Ptree child = Pt.get_child ("con");  Take a child node cout<< "name is:" <<child.get<string> ("name") <<endl; 
  Child node operation, in fact, as the above operation child = Pt.get_child ("Con.urls"); For (Boost_auto (Pos,child.begin ());p OS!= child.end () ++pos)//boost AUTO {cout<< "\ T" +pos->second.data 
   () <<endl;  } pt.put ("Con.name", "sword"); Change a key value Pt.add ("Con.urls.url", http://www.baidu.com);  Add a key value Write_xml ("Conf.xml", PT); 
  Writes XML GetChar (); 
return 0; 

 }

The display is run as: 
ID is 1 
Try Default100 
name Is:fansy 
    http://blog.csdn.net//fansongy 
    http://weibo.com// Fansongy 

Config.xml: 
<?xml version= "1.0" encoding= "Utf-8"?> 
<con> 
 <id>1</id> 
 <name>Sword</name> 
<urls> 
   <url>http://blog.csdn.net//fansongy</url> 
   <url>http://weibo.com//fansongy</url> 
   <url>http://www.baidu.com</url> 
</urls> 
</con>  

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