download image using libcurl

[mbag]

Hello everyone!
I am trying to download an image from an URL using libcurl, and I have found an appropriate example here http://www.cplusplus.com/forum/general/46477/ . This example creates the .jpg file in my project's folder but it does not download the picture, this part CURLE_OK == curl_read(url, ofs) is not succeeded.
Can anyone explain to me how to fix this problem?
Thank you!

#include <curl/curl.h>
#include <fstream>
#include <sstream>
#include <iostream>

// callback function writes data to a std::ostream
static size_t data_write(void* buf, size_t size, size_t nmemb, void* userp)
{
	if (userp)
	{
		std::ostream& os = *static_cast<std::ostream*>(userp);
		std::streamsize len = size * nmemb;
		if (os.write(static_cast<char*>(buf), len))
			return len;
	}

	return 0;
}


CURLcode curl_read(const std::string& url, std::ostream& os, long timeout = 30)
{
	CURLcode code(CURLE_FAILED_INIT);
	CURL* curl = curl_easy_init();

	if (curl)
	{
		if (CURLE_OK == (code = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &data_write))
			&& CURLE_OK == (code = curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L))
			&& CURLE_OK == (code = curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L))
			&& CURLE_OK == (code = curl_easy_setopt(curl, CURLOPT_FILE, &os))
			&& CURLE_OK == (code = curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout))
			&& CURLE_OK == (code = curl_easy_setopt(curl, CURLOPT_URL, url.c_str())))
		{
			code = curl_easy_perform(curl);
		}
		curl_easy_cleanup(curl);
	}
	return code;
}

// Image URL
std::string url = "http://thecandybros.co.uk/images/Cfudge.jpg";

int main()
{
	curl_global_init(CURL_GLOBAL_ALL);

	std::ofstream ofs("output.jpg", std::ostream::binary);

	if (CURLE_OK == curl_read(url, ofs))
	{
		// Image successfully written to file
	}

	curl_global_cleanup();
}