IDN support not enabled for cURL - c++

Question

I am having some issue getting an image into a dynamic memory buffer with cURL.
The bit of code used is the following:
struct memoryStruct {
char *memory;
size_t size;
};
static void* CURL_realloc(void *ptr, size_t size)
{
/* There might be a realloc() out there that doesn't like reallocing
NULL pointers, so we take care of it here */
if(ptr)
return realloc(ptr, size);
else
return malloc(size);
}
size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
size_t realsize = size * nmemb;
struct memoryStruct *mem = (struct memoryStruct *)data;
mem->memory = (char *)CURL_realloc(mem->memory, mem->size + realsize + 1);
if (mem->memory)
{
memcpy(&(mem->memory[mem->size]), ptr, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
}
return realsize;
}
int main()
{
std::string everything = "https://upload.wikimedia.org/wikipedia/commons/1/1e/Stonehenge.jpg";
CURL *curl; // CURL objects
CURLcode res;
memoryStruct buffer; // memory buffer
curl = curl_easy_init(); // init CURL library object/structure
if(curl) {
// set up the write to memory buffer
// (buffer starts off empty)
buffer.memory = NULL;
buffer.size = 0;
// (N.B. check this URL still works in browser in case image has moved)
curl_easy_setopt(curl, CURLOPT_URL, everything);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1); // tell us what is happening
// tell libcurl where to write the image (to a dynamic memory buffer)
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
curl_easy_setopt(curl,CURLOPT_WRITEDATA, (void *) &buffer);
// get the image from the specified URL
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
free(buffer.memory);
}
return 0;
}
As an error output I get the error saying the following:
I am however not sure to understand the error being displayed. My guess is that I should enable IDN support for curl? I am however not sure on how to proceed. Does that mean that I would have to recompile the library with IDN enabled? (If I find how to do it)
Thank you for your help

Answer 1

You're passing an std::string object to curl_easy_setopt, while you should be passing a C string. It's actually trying to resolve god-knows-what.
curl_easy_setopt(curl, CURLOPT_URL, everything.c_str());