在cpp中从curl检索响应文本

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() {
    CURL* curl;
    CURLcode res;
    std::string response;

    curl_global_init(CURL_GLOBAL_DEFAULT);
    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "http://example.com"); // 设置请求的URL
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback); // 设置回调函数
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response); // 设置回调函数的参数

        res = curl_easy_perform(curl); // 执行请求

        if (res != CURLE_OK) {
            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
        }

        curl_easy_cleanup(curl);
    }

    curl_global_cleanup();

    // 输出响应文本
    std::cout << response << std::endl;

    return 0;
}