如何检查Json文件中的键是否有效以及如何使用RapidJson在c++中创建对象数组

#include <iostream>
#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"

using namespace rapidjson;

int main() {
    // 1. 检查JSON文件中的键是否有效
    const char* json = "{\"name\": \"John\", \"age\": 30, \"city\": \"New York\"}";

    Document document;
    document.Parse(json);

    if (document.HasMember("name")) {
        std::cout << "The key 'name' is valid." << std::endl;
    } else {
        std::cout << "The key 'name' is not valid." << std::endl;
    }

    if (document.HasMember("address")) {
        std::cout << "The key 'address' is valid." << std::endl;
    } else {
        std::cout << "The key 'address' is not valid." << std::endl;
    }

    // 2. 使用RapidJson在C++中创建对象数组
    Document doc;
    doc.SetObject();

    Value array(kArrayType);

    Value obj1(kObjectType);
    obj1.AddMember("name", "John", doc.GetAllocator());
    obj1.AddMember("age", 30, doc.GetAllocator());
    array.PushBack(obj1, doc.GetAllocator());

    Value obj2(kObjectType);
    obj2.AddMember("name", "Jane", doc.GetAllocator());
    obj2.AddMember("age", 25, doc.GetAllocator());
    array.PushBack(obj2, doc.GetAllocator());

    doc.AddMember("people", array, doc.GetAllocator());

    StringBuffer buffer;
    Writer<StringBuffer> writer(buffer);
    doc.Accept(writer);

    std::cout << buffer.GetString() << std::endl;

    return 0;
}