连接JSON格式的post请求C++中的变量

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

// 回调函数，用于处理服务器响应
size_t WriteCallback(void* contents, size_t size, size_t nmemb, std::string* response) {
    size_t totalSize = size * nmemb;
    response->append((char*)contents, totalSize);
    return totalSize;
}

int main() {
    // 创建JSON对象
    rapidjson::Document json;
    json.SetObject();

    // 添加变量到JSON对象
    rapidjson::Document::AllocatorType& allocator = json.GetAllocator();
    json.AddMember("name", "John", allocator);
    json.AddMember("age", 30, allocator);
    json.AddMember("city", "New York", allocator);

    // 将JSON对象转换为字符串
    rapidjson::StringBuffer buffer;
    rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
    json.Accept(writer);
    std::string jsonStr = buffer.GetString();

    // 发送POST请求
    CURL* curl = curl_easy_init();
    if (curl) {
        std::string response;
        curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/api");
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, jsonStr.c_str());
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
        CURLcode res = curl_easy_perform(curl);
        if (res == CURLE_OK) {
            std::cout << "Server response: " << response << std::endl;
        }
        curl_easy_cleanup(curl);
    }

    return 0;
}