nlohmann

RobertDeMilo

Apr 28th, 2024 (edited)

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#include <iostream>
#include <fstream>
#include <nlohmann/json.hpp>
int main()
{
std::ifstream jsonFileStream("./settings.json");
nlohmann::json jsonData = nlohmann::json::parse(jsonFileStream);
//nlohmann::json::parse(R"({"dummy":"lel"})");
// std::ofstream jsonOut("./out.json");
// jsonOut<< std::setw(4)<<jsonData;
// std::cout<< std::setw(4)<<jsonData;
std::cout<<"Thread Count: " << jsonData["thread_count"].get<unsigned_int>()<<std::endl;
std::cout<<"Server Host: " << jsonData["server"]["host"].get<std::string>()<<std::endl;
std::cout<<"Server Host: " << jsonData["server"]["port"].get<unsigned_int>()<<std::endl;
auto itTC = jsonData.find("thread_count");
if(itTC!=jsonData.end())
{
if(itTC.value().is_number_unsigned())
{
std::cout<<"Thread count is valid!"<<std::endl;
}
}
for(auto it = jsonData.begin();it!=jsonData.end();++it)
{
std::cout<<it.key()<<" is "<<it.value()<<std::endl;
}
nlohmann::json jsonNew;
jsonNew["a"] = 7;
jsonNew["b"] = 1.99;
jsonNew["c"] = false;
jsonNew["d"] = "Hello World!";
jsonNew["arr"] = {5,6,"Hello",false, true,1.88};
jsonNew["obj"] = { {"a", 2}, {"b", "hello"}, {"arr", {1,2,3,4,5}}, {"o",{{"1", false},{"2", true}}}};
jsonNew["earr"] = nlohmann::json::array();
jsonNew["earr"].push_back(5);
jsonNew["earr"].push_back("x");
jsonNew["earr"].push_back("d");
jsonNew["eobj"] = nlohmann::json::object();
jsonNew["eobj"]["a"] = 1;
jsonNew["eobj"]["a"] = 10;
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <string>
#include <vector>
#include <nlohmann/json.hpp>
struct Person
{
std::string name;
int age;
};
void to_json(nlohmann::json& j, const Person &p)
{
j = nlohmann::json{{"name",p.name}, {"age", p.age}};
}
void from_json(const nlohmann::json& j, Person &p)
{
j.at("name").get_to(p.name);
j.at("age").get_to(p.age);
}
int main()
{
// Person p{"Alex", 18};
// nlohmann::json j{};
// j["name"] = p.name;
// j["age"] = p.age;
// std::cout<<j<<std::endl;
// std string serializedString = j.dump();
// Person p1{};
// nlohmann::json j1 = nlohmann::json::parse(serializedString);
// p1.name = j1["name"].get<std::string>();
// p1.age = j1["age"].get<int>();
Person p{};
nlohmann::json j = p;
std::cout<<j<<<<std::endl;
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
// struct myAnswer
// {
// int everything;
// };
// struct myObject
// {
// std::string currency;
// double value;
// };
// struct myStruct
// {
// float pi;
// bool happy;
// std::string name;
// void * nothing;
// myAnswer answer;
// std::vector<int> list;
// myObject object;
// };
// int main()
// {
// nlohmann::json j{};
// j["pi"]=3.141;
// j["happy"]= true;
// j["name"]= "Niels";
// j["nothing"] = nullptr;
// j["answer"]["everything"] =42;
// j["list"]= {1,0,2};
// j["object"]= {{"currency","USD"},{"value",42.99}};
// myStruct obj{};
// obj.pi = j["pi"].get<float>();
// obj.happy = j["happy"].get<bool>();
// obj.name = j["name"].get<std::string>();
// obj.nothing = j["nothing"].get_ptr<nlohmann::json::object_t*>();
// obj.answer = myAnswer{j["answer"]["everything"].get<int>()};
// j["list"].get_to<std::vector<int>>(obj.list);
// obj.object = myObject{j["object"]["currency"].get<std::string>(), j["object"]["value"].get<double>() };
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <string>
#include <vector>
#include "dependencies/include/nlohmann/json.hpp"
int main()
{
nlohmann::json objJson;
std::fstream fileInput;
fileInput.open("json2.json");
fileInput>>objJson;
std::cout<<objJson<<std::endl;
std::string nameMatrix;
std::string nameVector;
int size;
nameMatrix = objJson["configs"][0]["name_matrix"];
nameVector = objJson["configs"][0]["name_vector"];
size = objJson["configs"][0]["size"];
std::cout<<nameMatrix<<std::endl;
std::cout<<nameVector<<std::endl;
std::cout<<size<<std::endl;
fileInput.close();
return 0;
}

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