macchina.io使用C++解析JSON格式，给个复杂的示例

好的，以下是一个复杂的示例：

假设我们有以下JSON数据：

{
  "name": "John Doe",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "Anytown",
    "state": "CA",
    "zip": "12345"
  },
  "phoneNumbers": [
    {
      "type": "home",
      "number": "555-1234"
    },
    {
      "type": "work",
      "number": "555-5678"
    }
  ]
}

我们可以使用macchina.io中的JSON解析器来解析这个JSON数据，示例代码如下：

#include <iostream>
#include <vector>
#include <Poco/JSON/Parser.h>
#include <Poco/Dynamic/Var.h>

int main() {
    std::string jsonString = R"({
        "name": "John Doe",
        "age": 30,
        "address": {
            "street": "123 Main St",
            "city": "Anytown",
            "state": "CA",
            "zip": "12345"
        },
        "phoneNumbers": [
            {
                "type": "home",
                "number": "555-1234"
            },
            {
                "type": "work",
                "number": "555-5678"
            }
        ]
    })";

    Poco::JSON::Parser parser;
    Poco::Dynamic::Var result = parser.parse(jsonString);
    Poco::JSON::Object::Ptr root = result.extract<Poco::JSON::Object::Ptr>();

    std::string name = root->getValue<std::string>("name");
    int age = root->getValue<int>("age");

    Poco::JSON::Object::Ptr address = root->getObject("address");
    std::string street = address->getValue<std::string>("street");
    std::string city = address->getValue<std::string>("city");
    std::string state = address->getValue<std::string>("state");
    std::string zip = address->getValue<std::string>("zip");

    Poco::JSON::Array::Ptr phoneNumbers = root->getArray("phoneNumbers");
    std::vector<std::pair<std::string, std::string>> phoneNumbersVec;
    for (auto& item : *phoneNumbers) {
        Poco::JSON::Object::Ptr phoneNumber = item.extract<Poco::JSON::Object::Ptr>();
        std::string type = phoneNumber->getValue<std::string>("type");
        std::string number = phoneNumber->getValue<std::string>("number");
        phoneNumbersVec.push_back(std::make_pair(type, number));
    }

    std::cout << "name: " << name << std::endl;
    std::cout << "age: " << age << std::endl;
    std::cout << "street: " << street << std::endl;
    std::cout << "city: " << city << std::endl;
    std::cout << "state: " << state << std::endl;
    std::cout << "zip: " << zip << std::endl;
    for (auto& item : phoneNumbersVec) {
        std::cout << "type: " << item.first << ", number: " << item.second << std::endl;
    }

    return 0;
}

这个示例中，我们首先定义了一个JSON字符串，然后使用Poco库中的JSON解析器来解析JSON数据。我们从根对象中获取了name和age字段，从address对象中获取了street、city、state和zip字段，从phoneNumbers数组中获取了所有的电话号码。最后，我们将获取到的字段打印出来。