Download an image from an url using curl in c++
<p>I am doing a project and it's first step includes to download an image from an url and save it a some location.Further processing will be done on that image at the later stage.For this purpose I am using curl libraries in visual studio along with opencv.I am new to using curl libraries.I saw an answer <a href="https://stackoverflow.com/questions/10112959/download-an-image-from-server-curl-however-taking-suggestions-c">here</a>. But, I can't understand it.Here is my code</p>
<pre><code>#include &lt;stdio.h&gt;
#include &lt;curl/curl.h&gt;
#include &lt;curl/types.h&gt;
#include &lt;curl/easy.h&gt;
#include &lt;string&gt;

size_t write_data(void* ptr, size_t size, size_t nmemb, FILE* stream)
{
    size_t written;
    written = fwrite(ptr, size, nmemb, stream);
    return written;
}

int main(void)
{
    CURL* curl;
    FILE* fp;
    CURLcode res;
    char* url = &quot;http://pimg.tradeindia.com/01063301/b/1/CRO-Oscilloscope.jpg&quot;;
    char outfilename[FILENAME_MAX] = &quot;C:\\bbb.jpg&quot;;
    curl = curl_easy_init();
    if (curl)
    {
        fp = fopen(outfilename, &quot;wb&quot;);
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
        curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
        res = curl_easy_perform(curl);
        /* always cleanup */
        curl_easy_cleanup(curl);
        fclose(fp);
    }
    return 0;
}
</code></pre>
<p>Thanks for the help.</p>