CODEWITHSUNDEEP
c++curllibcurl
jng
jng

Reputation: 39

Receiving unhandled NULL exception when using curl_easy_cleanup(curl)

I have a Unity application that uses a c++ plugin that I wrote for making http requests. This plugin uses curl libraries.

As per curl documentation, they recommend using curl_easy_cleanup(curl) as the last command, in order to free the handle and clean up all the resources.

Here's my code that makes a simple http POST request:

struct curl_slist *headers = NULL;
CURL *curl = NULL;
curl  = curl_easy_init();
int httpCode(0);

if(curl)
{
    headers = curl_slist_append(headers, "Accept: application/json");
    headers = curl_slist_append(headers, "Content-Type: application/json");
    headers = curl_slist_append(headers, "charsets: utf-8");

    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
    //Set remote URL
    curl_easy_setopt(curl, CURLOPT_URL, endpoint.c_str());

    std::string params;
    for(std::unordered_map<std::string,std::string>::iterator it = parameters.begin(); it != parameters.end(); ++it)
    {
        params = it->first + ": " + it->second + " ";
        headers = curl_slist_append(headers, (const char *)params.c_str());
    }

    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, jsonObject.c_str());
    CURLcode res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, ResponseRecievedCallback);

    res = curl_easy_perform(curl);
    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpCode);

//Uncommenting this line makes my application crash

    //curl_easy_cleanup(curl);
}

However when I add this line, my unity app crashes with this following exception:

 Receiving unhandled NULL exception
Obtained 13 stack frames.
#0  0x000001207a4438 in Curl_expire_clear
#1  0x00000120790e25 in Curl_close

I've spent the past couple of days online searching for some solution, read curl documentation but couldn't find any help. I'd appreciate if someone can explain why this might crash?

Thanks much!

Upvotes: 0

Views: 603

Answers (1)

jng
jng

Reputation: 39

Fixed the issue by making httpCode a long instead of an int (per documentation). I must've overlooked it before!

Upvotes: 2

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