Question

我对Asio有一个简单的问题。

我写了三个课程response，request和client。

我想将部分代码放在循环中以尝试连接将有另一个用于创建请求的循环。

我无法想象for循环的正确位置。

这是我的代码：

// typedef const HTTPResponse&(*Callback) (const HTTPRequest& request,
typedef void (*Callback)(const HTTPRequest &request, const HTTPResponse &response, const system::error_code &ec);

#include <fstream>
// const HTTPResponse& handler(const HTTPRequest& request,
void handler(const HTTPRequest &request, const HTTPResponse &response, const system::error_code &ec) {
    if (ec == 0) {
        /*
        if res.status_code == 200:
            for chunk in res.iter_content(DEFAULT_BUFFER_SIZE) :
                buffer.write(chunk)
            Logger.info("Fetched {0} completed in {1}s".format(id, time.time() - start))
            if len(buffer.getbuffer()) <= 0 :
                Logger.info("Buffer for {0} is empty ".format(id))
            return buffer.getbuffer()
        else:
            Logger.warn("Request to {0} failed with error code : {1} ".format(url, str(res.status_code)))
        */

        std::ofstream outFile("image.bc5", std::ofstream::out, std::ofstream::binary);

        outFile << response.get_response().rdbuf();

        outFile.close();

    } else if (ec == asio::error::operation_aborted) {
        std::cout << "Request #" << request.get_id() << " has been cancelled by the user." << std::endl;
    } else {
        std::cout << "Request #" << request.get_id() << " failed! Error code = " << ec.value()
                  << ". Error message = " << ec.message() << std::endl;
    }
    return response; //////?????????????
}

#include <iomanip>
#include <map>
#include <sstream>

void create_tasks(const symbols_enum &symbol, date day) {
    int start = 0;

    if (is_dst(day)) {
        start = 1;
    }

    ostringstream oss;
    oss << symbol;
    std::string url_currency{ oss.str() };
    std::ostringstream().swap(oss); // swap m with a default constructed stringstream
    std::string url_year{ day.year() };

    stringstream ss_month;
    ss_month << setw(2) << setfill('0') << ((day.month().as_number()) - 1);
    string url_month{ ss_month.str() };
    std::stringstream().swap(ss_month); // swap m with a default constructed stringstream
    // std::string url_month{std::to_string((day.month().as_number()) - 1)};

    stringstream ss_day;
    ss_day << setw(2) << setfill('0') << day.day().as_number();
    string url_day{ ss_day.str() };
    std::stringstream().swap(ss_day); // swap m with a default constructed stringstream
    // std::string url_day{day.day()};

    std::string URL{ protocol_host_URL + "/" + "datafeed" + "/" + url_currency + "/" + url_year + "/" + url_month +
                     "/" + url_day + "/" };

    HTTPClient client;

    // std::shared_ptr<HTTPRequest> request = client.create_request(hour, URL);
    std::map<std::string, std::shared_ptr<HTTPRequest> > requests_variables;
    // for (int i = 1; i < 3; ++i) {
    // std::string varname = "sol" + std::to_string(i);
    // variables[varname] = i * i;
    //}
    for (int hour = 0; hour < 24; hour++) {
        stringstream ss_hour;
        ss_hour << setw(2) << setfill('0') << hour;
        string url_hour{ ss_hour.str() };
        std::stringstream().swap(ss_hour); // swap m with a default constructed stringstream
        URL = URL + url_hour + "h_ticks.bi5";

        std::string request_name = "request_" + std::to_string(hour);
        requests_variables[request_name] = client.create_request(hour, URL);
        requests_variables[request_name]->set_callback(handler);
        requests_variables[request_name]->execute();

        /*
        for (int i : boost::irange(0, ATTEMPTS))
            {
            try
                {
                    requests_variables[request_name]->execute();
                }
            catch (system::system_error &e)
                {
                    std::cout << "Error occured! Error code = " << e.code()
                    << ". Message: " << e.what();
                    return e.code().value();
                }
            }
        */
    }
        tasks = [asyncio.ensure_future(get]


            return tasks;
}

评论中的代码是循环的猜测位置。

可能有python代码，我试图模仿python异步代码，这个代码在这个地方“如果正确的地方”将在单词后转换。

我不需要转换为c ++，我只需要帮助确定在此代码中使用完成处理程序的试验循环的位置。
来自Boost Asio C ++的asio代码。

如果for循环代码应该在类request或response或client中，请告诉我。

如果有人需要完整代码，请告诉我。我担心我会发布很多“不相关的代码”，否则：）

c ++ asio在for循环

0 个答案: