【发布时间】：2015-05-28 19:07:20
【问题描述】：
好的，所以过去几天我一直在努力解决这个问题，但我仍然无法做到正确。我有一个 std::list 容器，我想将它序列化为 JSON 字符串，以便我可以通过网络发送它。
注意：我使用以下代码编译我的代码：
g++ -std=c++11 -o main main.cpp DBAccess11.cpp -lsqlite3 -lboost_serialization
下面是我的 DBAccess1.h 文件。
#ifndef DBAccess1_HH
#define DBAccess1_HH
#include <list> // I have deleted some header for sake of readability
#include <boost/serialization/list.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
using namespace std;
using boost::property_tree::ptree;
using boost::property_tree::read_json;
using boost::property_tree::write_json;
using boost::property_tree::basic_ptree;
//================================//
struct SiteCode
{
int siteID;
int siteCode;
};
inline ostream& operator<< (ostream &out, SiteCode &site)
{
out << "(" << site.siteID << "," << site.siteCode << ")";
return out;
}
//================================//
class sqliteDB {
list<SiteCode> Site_Code_list;
public:
list<SiteCode> GET_ALL_Site_Code();
void printList();
};
#endif**
下面是定义所有函数的DBAccess11.cpp文件
#include <list> // I have deleted some header for sake of readability
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/serialization/list.hpp>
#include "DBAccess1.h"
using boost::property_tree::ptree;
using boost::property_tree::read_json;
using boost::property_tree::write_json;
using boost::property_tree::basic_ptree;
list<SiteCode> sqliteDB::GET_ALL_Site_Code()
{
sqlite3 *db;
const char *sql;
sqlite3_stmt * stmt;
int rc = sqlite3_open("/path/to/database.db", &db);
sql = "SELECT * FROM SiteCode;";
rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
while(sqlite3_step(stmt)==SQLITE_ROW) {
int A = sqlite3_column_int(stmt, 0);
int B = sqlite3_column_int(stmt, 1);
SiteCode info;
info.siteID = A;
info.siteCode = B;
cout<<"Preparing to push data into List"<<endl;
Site_Code_list.push_back(info);
cout<<"Data was pushed successfully"<<endl;
ptree pt;
for (auto& entry: list<SiteCode> Site_Code_list) //<< ERROR LINE80
pt.put(entry.siteID, entry.siteCode);
std::ostringstream buf;
write_json (buf, pt, false);
cout<< buf.str() << endl;
}
sqlite3_finalize(stmt);
sqlite3_close(db);
return Site_Code_list;
}
//====================================================//
void sqliteDB::printList()
{
int s = Site_Code_list.size();
cout << "The size of List is :" << s << endl;
for( list<SiteCode> :: iterator it = Site_Code_list.begin(); it != Site_Code_list.end(); it++)
cout << *it << " ";
}
下面是main.cpp
#include <list> // I have deleted some header for sake of readability
#include <boost/serialization/list.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
using namespace std;
using boost::property_tree::ptree;
using boost::property_tree::read_json;
using boost::property_tree::write_json;
using boost::property_tree::basic_ptree;
int main()
{
sqliteDB object1;
object1.GET_ALL_Site_Code();
object1.printList();
cout << "\n\nAll the statement were executed properly\n\n";
return 0;
}
我得到的错误如下：
DBAccess11.cpp: In member function ‘std::list<SiteCode> sqliteDB::GET_ALL_Site_Code()’:
DBAccess11.cpp:80:38: error: expected primary-expression before ‘Site_Code_list’
for (auto& entry: list<SiteCode> Site_Code_list)
^
DBAccess11.cpp:80:38: error: expected ‘)’ before ‘Site_Code_list’
DBAccess11.cpp:80:52: error: expected ‘;’ before ‘)’ token
for (auto& entry: list<SiteCode> Site_Code_list)
^
我的问题：
(1)这是使用 boost 将 std::list 转换为 JSON 的正确方法吗？如果否，那么应该怎么做？ （注意-我只能使用 boost 而不能使用其他库）
(2) 如果我的方法是正确的，那么我应该做出哪些改变来纠正它？
【问题讨论】：
-
应该只用于（自动&条目：Site_Code_list）
-
@ForEveR：我确实已经尝试过了。我收到以下错误。 DBAccess11.cpp:80:40: 错误: 没有匹配函数调用'boost::property_tree::basic_ptree<:basic_string>, std::basic_string
>::add(int&, int&)' pt.add(entry.siteID, entry.siteCode);
标签： c++ json serialization boost boost-propertytree