boost.property_tree

//made by davidsu33
//boost.property_tree是一个保存了多个属性值的树形数据结构
//boost.property_tree可以解析xml ini json和info四种格式的文本

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>

#include <boost/typeof/typeof.hpp>

#include <iostream>
#include <string>
#include <cassert>
using namespace std;

void putline(const char * str)
{
cout<<str<<endl;
}

void putline(const std::string& str)
{
cout<<str<<endl;
}

void parse_xml()
{
std::string filename = "./conf.xml";

typedef boost::property_tree::ptree PTree;
PTree pt;
boost::property_tree::read_xml(filename, pt);

string theme = pt.get<string>("conf.theme");
int guiID = pt.get<int>("conf.gui");

//int id = pt.get_value<int>();
assert(guiID == 1);

//不存在属性返回默认值
int def = pt.get<int>("conf.no", 100000);
assert(def = 100000);

BOOST_AUTO(childs2, pt.get_child("conf.urls"));
PTree childs = pt.get_child("conf.urls");

//???
//int count = pt.count("urls");
//assert(count == 3);

//读取多子节点的数据
BOOST_AUTO(it, childs.begin());
BOOST_AUTO(iend, childs.end());
for (;
it != iend; ++it)
{
//迭代器指向ptree的value_type，
//它的second成员是子节点自身
//cout<<it->second.get_value<string>()<<endl;

//等价于
cout<<it->second.data()<<endl;
}

//读取XML的属性，不支持声明的读取
//string decl = pt.get<string>(""); //读取XML声明

BOOST_ASSERT(pt.get<string>("conf.gui.<xmlattr>.lib") == "QT");
BOOST_ASSERT(pt.get<int>("conf.theme.<xmlattr>.id") == 1002);
BOOST_ASSERT(pt.get<string>("conf.<xmlcomment>") == "this is conf comment");

//貌似不支持CDATA，测试未通过
//std::string xmltext = pt.get<string>("conf.<xmltext>");
//BOOST_ASSERT(pt.get<string>("conf.<xmltext>") == "字符数据-character data");
}

int _tmain(int argc, _TCHAR* argv[])
{
parse_xml();
getchar();
return 0;
}