'ByBit Api. Open Active Order. Return "empty param of timestamp". Libcurl c++

Please help!!!! Is there a working example of opening an order in C++

Constantly sending a request to open an order POST https://api.bybit.com/private/linear/order/create

{"api_key":"WTVpIZqOwx2LGYY3TB","order_type":"Market","qty":5,"side":"Buy","symbol":"MATICUSDT","time_in_force":"GoodTillCancel","timestamp":1652444871610,"sign":"433b79f452a6c43f3b507df4b5cee84314c7aae584546a889cde7d750ac2f4a6"}

I get an error

{"ret_code":10001,"ret_msg":"empty param of timestamp","ext_code":"","ext_info":"","result":null,"time_now":"1652444872.324646"

And no one can explain why

the code itself

int main(int, char **)
{
    CURL *curl;
    CURLcode res;

    unsigned long long timestamp = chrono::duration_cast<chrono::milliseconds>(chrono::_V2::system_clock::now().time_since_epoch()).count();

    string api_key = "WT***************3TB";
    string secret_key = "Ik**************4vE";

    string reqParam = "api_key=" + api_key + "&order_type=Market&qty=5&side=Buy&symbol=MATICUSDT&time_in_force=GoodTillCancel&timestamp=" + to_string(timestamp);

    string sign = hmacEncode(reqParam, secret_key);

    string json = "{\"api_key\":\"" + api_key + "\",\"side\"=\"Buy\",\"symbol\"=\"MATICUSDT\",\"order_type\":\"Market\",\"qty\":2,\"time_in_force\":\"GoodTillCancel\",\"timestamp\":" + to_string(timestamp) + " ,\"sign\":\"" + sign + "\"}";

    cout << json << endl;

    curl = curl_easy_init();
    if (curl)
    {
        // set params
        curl_easy_setopt(curl, CURLOPT_POST, 1);          // post req
        curl_easy_setopt(curl, CURLOPT_URL, "https://api.bybit.com/private/linear/order/create"); // url
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, json.c_str());
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);

        // Header "Content-Type: application/json"
        struct curl_slist *headers = NULL;
        curl_slist_append(headers, "Content-Type: application/json");
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

        /* Perform the request, res will get the return code */
        res = curl_easy_perform(curl);
        /* Check for errors */
        if (res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));

        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    return 0;
}

https://github.com/alex290/bybitorder-api/blob/master/src/main.cpp

c++apilibcurlbybit


Solution 1:[1]

Everything solved the problem. Here is the working code

int main(int, char **)
{
    CURL *curl;
    CURLcode res;

    unsigned long long timestamp = chrono::duration_cast<chrono::milliseconds>(chrono::_V2::system_clock::now().time_since_epoch()).count();

    string api_key = "WT***************3TB";
    string secret_key = "Ik**************4vE";

    string reqParam = "api_key=" + api_key + "&close_on_trigger=false&order_type=Market&position_idx=0&qty=5&reduce_only=false&side=Buy&symbol=MATICUSDT&time_in_force=GoodTillCancel&timestamp=" + to_string(timestamp);


    string sign = hmacEncode(reqParam, secret_key);

    reqParam = reqParam + "&sign=" + sign;
 
    string urlStr = "https://api.bybit.com/private/linear/order/create?" + reqParam;

    cout << urlStr << endl;

    curl = curl_easy_init();
    if (curl)
    {
        // set params
        curl_easy_setopt(curl, CURLOPT_POST, 1);             // post req
        curl_easy_setopt(curl, CURLOPT_URL, urlStr.c_str()); // url
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "");
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);

        // Header "Content-Type: application/json"
        struct curl_slist *headers = NULL;
        curl_slist_append(headers, "Content-Type: application/json");
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

        /* Perform the request, res will get the return code */
        res = curl_easy_perform(curl);
        /* Check for errors */
        if (res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));

        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    return 0;
}

Solution 2:[2]

I see some strange things. Your wrong JSON in the code:

"\"side\"=\"Buy\",\"symbol\"=\"MATICUSDT\"

It is not consistent with the dumped JSON

"side":"Buy","symbol":"MATICUSDT".

Your code has space after the timestamp, the dumped JSON has no spaces. And the parameter order is different.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Alexandr
Solution 2

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