Json_with_cpp

install Json on visual studio c++

1- First download This as zip

2- Extract it

3- Run file named "amalgamate.py" (if nothing occures open file using any python compiler then run it)

4- Now you can see new folder created named "dist"

5- Copy dist , include folders and go to the project destination then paste (near to .cpp file)

6- Now open project properties with Visual studio -> at the top of the window make sure that Configuration set as (all configurations) and platform set as (all platforms) -> open C/C++ tab -> click on additional include directories and press edit then press 3 dots (...) and open project folder then choose include folder (near to dist and depug) -> press apply and Ok

7- Open project destination -> open dist and copy .cpp file then past it on sorurce File on your compiler

8- Open project destination -> open dist and open json folder and copy 2 .h files then paste them on Header files on your compiler

7- Congratulations Your project is ready to use json

Code for testing :

#include<iostream>
#include<json\json.h>
using namespace std;
int main() {
	std::unique_ptr<std::string> httpData(new std::string());
	Json::Value jsonData;
	Json::Reader jsonReader;
	if (jsonReader.parse(*httpData.get(), jsonData))
	{
	}
}

Write on files

#include<iostream>
#include<json\json.h>
#include<fstream>
#include<string>
using namespace std;
using namespace Json;
int main() {
	Value root;
	string name, email , password ;
	// create file and write on it 
	ofstream write("C:/Users/Lime5/Desktop/Database/12.json");
	root["name"] = "Gaber"; 
	root["Email"] = "se505831@gmail.com";
	write << root << "\n";
	write.close();
}

Read from files

#include<iostream>
#include<json\json.h>
#include<fstream>
#include<string>
using namespace std;
using namespace Json;
int main() {
	Value root; 
	string name, email; 
	Reader reader;
	ifstream read ("C:/Users/Lime5/Desktop/Database/12.json");
	bool ok = reader.parse(read , root);
	if (ok) {
		cout << "success\n";
		cout << root.size() << "\n";
		
		//cout << root["name"]; or
		name = root.get("name", "").toStyledString(); // if no attribute called name on it will return empty string 
		email = root.get("Email", "").toStyledString(); // if no attribute called email on it will return empty string 
		cout << "name : " << name << "\n" << "email : " << email;
	}
	else {
		cout << "fail\n";
	}
}

Update on file

let's say that i have file :
{
"quantity" : 5 ,
"Name" : "Gaber"
}
and i want to edit the quantity attribute only leading that the resulting json file is
{
"quantity" : 6 ,
"Name" : "Gaber"
}
let's know how !! :

#include<iostream>
#include<json\json.h>
#include<fstream>
#include<string>
using namespace std;
using namespace Json;
int main() {
	Value root;
	Reader reader;
	ifstream read("C:/Users/Lime5/Desktop/Database/test.json");
	bool ok = reader.parse(read, root);
	if (ok) {
		cout << "Before : " << root;
		ofstream write("C:/Users/Lime5/Desktop/Database/test.json");
		int x = root["quantity"].asInt();
		x++;
		root["quantity"] = x;
		write << root << "\n";
		cout << "after" << root << "\n";
		write.close();
	}
}