property_tree可以解析ini,xml,json,info等格式的文本
以下示例是解析json格式的文本

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <string>
#include <sstream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <time.h>using namespace std;
using namespace boost::property_tree;const string file_path = "c:\\test.txt";void write_json_data_into_file(void)
{printf("%s\n","write json data");boost::property_tree::ptree root, items;boost::property_tree::ptree item1;item1.put("ID","1");item1.put("Name","wang");items.push_back(std::make_pair("1",item1));boost::property_tree::ptree item2;item2.put("ID","2");item2.put("Name","zhang");items.push_back(std::make_pair("2",item2));root.put_child("users",items);boost::property_tree::write_json(file_path,root);
}void read_json_data_from_file(void)
{printf("%s\n","read json data");boost::property_tree::ptree root;boost::property_tree::ptree items;boost::property_tree::read_json<boost::property_tree::ptree>(file_path,root);items = root.get_child("users");for(boost::property_tree::ptree::iterator it=items.begin(); it != items.end(); ++it){string key=it->first;//key IDstring ID=it->second.get<string>("ID");string Name=it->second.get<string>("Name");cout<<"key: "<<key.c_str()<<'\t';printf("ID: %s    Name: %s",ID.c_str(), Name.c_str());cout<<endl;cout<<"ID:"<<ID<<'\t'<<"Name:"<<Name<<endl;}cout<<"success"<<endl;
}void write_json_data_into_string(void)
{boost::property_tree::ptree item;item.put("a","2");std::stringstream is;boost::property_tree::write_json(is,item);std::string s = is.str();cout<<"json s:"<<s<<endl;
}void read_json_data_from_string(void)
{/*C++ 中 字符串形式的json串 需要使用 \ 转义 双引号*/std::string str_json = "{\"count\":10,\"people\":[{ \"firstName\": \"Brett\", \"lastName\":\"McLaughlin\", \"email\": \"aaaa\" },{ \"firstName\": \"Jason\", \"lastName\":\"Hunter\", \"email\": \"bbbb\"},{ \"firstName\": \"Elliotte\", \"lastName\":\"Harold\", \"email\": \"cccc\" }]}";std::stringstream str_stream(str_json);boost::property_tree::ptree root;boost::property_tree::read_json(str_stream,root);root.put("upid","001");// 插入一个数组boost::property_tree::ptree exif_array;boost::property_tree::ptree array1, array2, array3;array1.put("Make", "NIKON");array2.put("DateTime", "2011:05:31 06:47:09");array3.put("Software", "Ver.1.01");//   exif_array.push_back(std::make_pair("Make", "NIKON"));//   exif_array.push_back(std::make_pair("DateTime", "2011:05:31 06:47:09"));//   exif_array.push_back(std::make_pair("Software", "Ver.1.01"));exif_array.push_back(std::make_pair("", array1));exif_array.push_back(std::make_pair("", array2));exif_array.push_back(std::make_pair("", array3));root.put_child("exifs", exif_array);std::stringstream str_stream_temp;boost::property_tree::write_json(str_stream_temp, root);//write_json(str_stream_temp, root);std::string str = str_stream_temp.str();cout<<str<<endl;
}void testMsg(void)
{string str_json = "{\"TEST\":\"\",\"MSG\":\"130\",\"TKT\":[{\"DTYP\":\"T\",\"STOT\":\"1\",\"SNUM\":\"1\",\"CPN\":[{\"CNBR\":\"1\",\"DDAT\":\"090117\",\"DTME\":\"1205\",\"ADAT\":\"090117\",\"ATME\":\"1340\",\"ORIG\":\"TSA\",\"DEST\":\"PVG\",\"ALC1\":\"FM\",\"FLTN\":\"802\",\"CLAS\":\"Y\",\"FSTN\":\"OK\",\"FBAS\":\"Y\",\"BAGA\":\"20K\"}]}]}";std::stringstream str_stream(str_json);boost::property_tree::ptree root;boost::property_tree::read_json(str_stream,root);boost::property_tree::ptree::iterator root_it = root.begin();for(; root_it != root.end(); ++root_it){string key = root_it->first;if("TKT" == key){boost::property_tree::ptree tkt_node = root.get_child(key);boost::property_tree::ptree::iterator tkt_node_it = tkt_node.begin();for(; tkt_node_it != tkt_node.end(); ++tkt_node_it){boost::property_tree::ptree tkt = tkt_node_it->second;boost::property_tree::ptree::iterator tkt_it = tkt.begin();for(; tkt_it != tkt.end(); ++tkt_it){string tkt_key = tkt_it->first;if("CPN" == tkt_key){boost::property_tree::ptree cpn_node = tkt.get_child(tkt_key);boost::property_tree::ptree::iterator cpn_node_it = cpn_node.begin();for(; cpn_node_it != cpn_node.end(); ++cpn_node_it){boost::property_tree::ptree cpn = cpn_node_it->second;boost::property_tree::ptree::iterator cpn_it = cpn.begin();for(; cpn_it != cpn.end();++cpn_it){string cpn_key = cpn_it->first;string cpn_val = cpn.get<string>(cpn_key);cout<<cpn_key<<":"<<cpn_val<<endl;}}}else{string tkt_val = tkt.get<string>(tkt_key);cout << tkt_key << ":"<<tkt_val<<endl;}}}}else{string val = root.get<string>(key);cout << key <<":"<< val <<endl;//Sleep(1000);}}
}void bianli_json(void)
{string json_string="{\"-f\": \"/usr/reservedfff_dir\", \"-s\": \"/usr/reservedddd_dir\"}";string str_head;string str_node_val;boost::property_tree::ptree pt,p1,p2;stringstream stream(json_string);try{boost::property_tree::read_json<boost::property_tree::ptree>(stream, pt);cout<<"parsing ok\n"<<endl;for (boost::property_tree::ptree::iterator ita = pt.begin(); ita != pt.end(); ++ita){cout<<"first:"<<ita->first<<endl;str_node_val = pt.get<string>(ita->first);cout<<str_node_val<<endl;}}catch(std::runtime_error& e){std::cout<<e.what()<<endl;}
}void test(void)
{string str_json = "{\"TEST\":\"\",\"MSG\":\"130\",\"TKT\":[{\"DTYP\":\"T\",\"STOT\":\"1\",\"SNUM\":\"1\",\"CPN\":[{\"CNBR\":\"1\",\"DDAT\":\"090117\",\"DTME\":\"1205\",\"ADAT\":\"090117\",\"ATME\":\"1340\",\"ORIG\":\"TSA\",\"DEST\":\"PVG\",\"ALC1\":\"FM\",\"FLTN\":\"802\",\"CLAS\":\"Y\",\"FSTN\":\"OK\",\"FBAS\":\"Y\",\"BAGA\":\"20K\"}]}]}";std::stringstream str_stream(str_json);boost::property_tree::ptree root;boost::property_tree::read_json(str_stream,root);boost::property_tree::ptree tkt = root.get_child("TKT");stringstream tkt_stream;boost::property_tree::write_json(tkt_stream, tkt);cout<<tkt_stream.str()<<endl; //通过打印可以看到 first 为空for(boost::property_tree::ptree::iterator it = tkt.begin(); it!=tkt.end();++it){boost::property_tree::ptree inner = it->second; //first为空//string DTYP_val = inner.get<string>("DTYP");//cout << "DTYP" <<":"<< DTYP_val<<endl;boost::property_tree::ptree::iterator it_tkt = inner.begin();for(; it_tkt != inner.end(); ++it_tkt){string innet_key = it_tkt->first;cout<<innet_key<<":"<<inner.get<string>(innet_key)<<endl;}break;}//    boost::property_tree::ptree pt,pptt,ttt;//    string s = "{\"data\":[{\"id\":1,\"name\":\"chen\"},{\"id\":2,\"name\":\"zhang\"}]}";//    stringstream stream(s);//    read_json(stream, pt);//    pptt = pt.get_child("data");//    for (boost::property_tree::ptree::iterator it = pptt.begin(); it != pptt.end(); ++it)//    {//        ttt = it->second; //first为空//        cout<<"id="<<ttt.get<string>("id")<<endl;//        cout<<"name="<<ttt.get<string>("name")<<endl;//    }
}void parseMsg_1(void)
{string msg_str = "{\"MSG\":\"130\",\"CRSC\":\"MU\",\"CRSL\":\"BJS\",\"TAID\":\"08692057\",\"IHID\":\"PEK112\",\"ORGT\":\"A\",\"CRSN\":\"9995\",\"IHIB\":\"PEK112\",\"IDTP\":\"B\",\"PNR1\":\"NYFY37\",\"PNR2\":\"MU\",\"SURN\":\"zhang\",\"GIVN\":\"san\",\"FMID\":\"PPG19739941\",\"DTIS\":\"030117\",\"JORG\":\"TPE\",\"JDST\":\"MAD\",\"FAMT\":\"1560.00\",\"FCUR\":\"CNY\",\"TAMT\":\"1660.00\",\"TCUR\":\"CNY\",\"FANF\":\"H/1560.00/CNY+G/00:00/CNY\",\"FOPF\":\"CC\",\"TAXF\":\"T/CNY/50.00/CN+T/CNY/50.00/YQ\",\"FACF\":\"M/09JAN17TSA FM PVG MU JFK/-GRU JJ MAD1560.00CNY1560.00END\",\"TKT\":[{\"DTYP\":\"T\",\"STOT\":\"1\",\"SNUM\":\"1\",\"CPN\":[{\"CNBR\":\"1\",\"DDAT\":\"090117\",\"DTME\":\"1205\",\"ADAT\":\"090117\",\"ATME\":\"1340\",\"ORIG\":\"TSA\",\"DEST\":\"PVG\",\"ALC1\":\"FM\",\"FLTN\":\"802\",\"CLAS\":\"Y\",\"FSTN\":\"OK\",\"FBAS\":\"Y\",\"BAGA\":\"20K\"},{\"CNBR\":\"1\",\"DDAT\":\"090117\",\"DTME\":\"1205\",\"ADAT\":\"090117\",\"ATME\":\"1340\",\"ORIG\":\"TSA\",\"DEST\":\"PVG\",\"ALC1\":\"FM\",\"FLTN\":\"802\",\"CLAS\":\"Y\",\"FSTN\":\"OK\",\"FBAS\":\"Y\",\"BAGA\":\"20K\"}]},{\"DTYP\":\"T\",\"STOT\":\"1\",\"SNUM\":\"1\",\"CPN\":[{\"CNBR\":\"1\",\"DDAT\":\"090117\",\"DTME\":\"1205\",\"ADAT\":\"090117\",\"ATME\":\"1340\",\"ORIG\":\"TSA\",\"DEST\":\"PVG\",\"ALC1\":\"FM\",\"FLTN\":\"802\",\"CLAS\":\"Y\",\"FSTN\":\"OK\",\"FBAS\":\"Y\",\"BAGA\":\"20K\"}]}]}";stringstream msg_ss(msg_str);boost::property_tree::ptree msg;boost::property_tree::read_json(msg_ss, msg);boost::property_tree::ptree::iterator msg_it = msg.begin();for(; msg_it != msg.end(); ++msg_it){string msg_key = msg_it->first;string val = "";if("TKT" == msg_key){boost::property_tree::ptree tkt_node = msg.get_child(msg_key);boost::property_tree::ptree::iterator tkt_node_it = tkt_node.begin();for(; tkt_node_it != tkt_node.end(); ++tkt_node_it){boost::property_tree::ptree tkt = tkt_node_it->second;boost::property_tree::ptree::iterator tkt_it = tkt.begin();for(; tkt_it != tkt.end(); ++tkt_it){string tkt_key = tkt_it->first;if("CPN" == tkt_key){boost::property_tree::ptree cpn_node = tkt.get_child(tkt_key);boost::property_tree::ptree::iterator cpn_node_it = cpn_node.begin();for(; cpn_node_it != cpn_node.end(); ++cpn_node_it){boost::property_tree::ptree cpn = cpn_node_it->second;boost::property_tree::ptree::iterator cpn_it = cpn.begin();for(; cpn_it != cpn.end(); ++cpn_it){string cpn_key = cpn_it->first;val = cpn.get<string>(cpn_key);cout << cpn_key << ":" << val <<endl;}}}else{val = tkt.get<string>(tkt_key);cout<< tkt_key << ":" << val <<endl;}}}}else{val = msg.get<string>(msg_key);cout<< msg_key<<":"<<val<<endl;}}}void parseMsg(void)
{string msg_str = "{\"MSG\":\"MSG\",\"CRSC\":\"CRSC\",\"CRSL\":\"CRSL\",\"TAID\":\"TAID\",\"IHID\":\"IHID\",\"ORGT\":\"ORGT\",\"CRSN\":\"CRSN\",\"IHIB\":\"IHIB\",\"IDTP\":\"IDTP\",\"PNR1\":\"PNR1\",\"PNR2\":\"PNR2\",\"TIF\":[{\"SURN\":\"SURN\",\"GIVN\":\"GIVN\",\"FMID\":\"FMID\",\"INFP\":\"INFP\",\"UMCH\":\"UMCH\",\"JORG\":\"JORG\",\"JDST\":\"JDST\",\"FAMT\":\"FAMT\",\"FCUR\":\"FCUR\",\"TAMT\":\"TAMT\",\"TCUR\":\"TCUR\",\"FANF\":\"FANF\",\"FOPF\":\"FOPF\",\"TAXF\":\"TAXF\",\"TKT\":[{\"TKNB\":\"TKNB\",\"STOT\":\"STOT\",\"SNUM\":\"SNUM\",\"CPN\":[{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"},{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"}]},{\"TKNB\":\"TKNB\",\"STOT\":\"STOT\",\"SNUM\":\"SNUM\",\"CPN\":[{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"},{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"}]}]},{\"SURN\":\"SURN\",\"GIVN\":\"GIVN\",\"FMID\":\"FMID\",\"INFP\":\"INFP\",\"UMCH\":\"UMCH\",\"JORG\":\"JORG\",\"JDST\":\"JDST\",\"FAMT\":\"FAMT\",\"FCUR\":\"FCUR\",\"TAMT\":\"TAMT\",\"TCUR\":\"TCUR\",\"FANF\":\"FANF\",\"FOPF\":\"FOPF\",\"TAXF\":\"TAXF\",\"TKT\":[{\"TKNB\":\"TKNB\",\"STOT\":\"STOT\",\"SNUM\":\"SNUM\",\"CPN\":[{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"},{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"}]},{\"TKNB\":\"TKNB\",\"STOT\":\"STOT\",\"SNUM\":\"SNUM\",\"CPN\":[{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"},{\"CNBR\":\"CNBR\",\"DDAT\":\"DDAT\",\"DTME\":\"DTME\",\"ADAT\":\"ADAT\",\"ATME\":\"ATME\",\"ORIG\":\"ORIG\",\"DEST\":\"DEST\",\"ALC1\":\"ALC1\",\"FLTN\":\"FLTN\",\"CLAS\":\"CLAS\",\"FSTN\":\"FSTN\",\"FBAS\":\"FBAS\",\"BAGA\":\"BAGA\"}]}]}]}";stringstream msg_ss(msg_str);ptree msg;read_json(msg_ss, msg);string val = "";for(ptree::iterator msg_it = msg.begin(); msg_it != msg.end(); ++msg_it){string msg_key = msg_it->first;if("TIF" == msg_key){ptree tif_node = msg.get_child(msg_key);for(ptree::iterator tif_node_it = tif_node.begin(); tif_node_it != tif_node.end(); ++tif_node_it){ptree tif = tif_node_it->second;for(ptree::iterator tif_it = tif.begin(); tif_it != tif.end(); ++tif_it){string tif_key = tif_it->first;if("TKT" == tif_key){ptree tkt_node = tif.get_child(tif_key);for(ptree::iterator tkt_node_it = tkt_node.begin(); tkt_node_it != tkt_node.end(); ++tkt_node_it){ptree tkt = tkt_node_it->second;for(ptree::iterator tkt_it = tkt.begin(); tkt_it != tkt.end(); ++tkt_it){string tkt_key = tkt_it->first;if("CPN" == tkt_key){ptree cpn_node = tkt.get_child(tkt_key);for(ptree::iterator cpn_node_it = cpn_node.begin(); cpn_node_it != cpn_node.end(); ++cpn_node_it){ptree cpn = cpn_node_it->second;for(ptree::iterator cpn_it = cpn.begin(); cpn_it != cpn.end(); ++cpn_it){string cpn_key = cpn_it->first;val = cpn.get<string>(cpn_key);cout<< cpn_key <<":"<<val<<endl;}}}else{val = tkt.get<string>(tkt_key);cout<<tkt_key<<":"<<val<<endl;}}}}else{val = tif.get<string>(tif_key);cout<< tif_key << ":" <<val <<endl;}}}}else{val = msg.get<string>(msg_key);cout<< msg_key << ":" <<val<<endl;}}
}int main()
{//    write_json_data_into_file();//    system("pause");//    read_json_data_from_file();//    system("pause");//    write_json_data_into_string();//    system("pause");//    read_json_data_from_string();cout<<"---------------------------"<<endl;testMsg();cout<<"---------------------------"<<endl;bianli_json();cout<<"---------------------------"<<endl;test();cout<<"---------------------------"<<endl;parseMsg();return 0;
}