jsoncpp的读写操作

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代码如下

#include <fstream>#include <cassert>#include <string>#include <iostream>#include "json/json.h"#pragma comment(lib, "lib_json.lib")using namespace std;int main(){{//读操作[{"name" : "xiaoy", "age" :17} , {"name" : "xiaot", "age" : 20}]ifstream  ifs;ifs.open("f:\\test.json");assert(ifs.is_open());Json::Reader reader;Json::Value root;if (!reader.parse(ifs, root, false)){return -1;}string name;int age;int size = root.size();for (int i = 0; i < size; i++){name = root[i]["name"].asString();age = root[i]["age"].asInt();cout << name << " " << age << endl;}}{//写操作[{"age":100,"name":"hello world"}]Json::Value root;Json::FastWriter writer;Json::Value person;person["name"] = "hello, world";person["age"] = 100;root.append(person);string json_file = writer.write(root);ofstream ofs;ofs.open("f:\\test.json");assert(ofs.is_open());ofs << json_file;}{//读操作{"name" : "小楼一夜听春雨","age" : 27}ifstream ifs;ifs.open("f:\\test.json");assert(ifs.is_open());Json::Reader reader;Json::Value root;if (!reader.parse(ifs, root, false)){return -1;}string name = root["name"].asString();int age = root["age"].asInt();cout << name << " " << age << endl;}return 0;}

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