Hello,

Currently I use curl to download files with this functions:

WebGet::WebGet ()
{
  curl_global_init(CURL_GLOBAL_ALL);

  /* init the curl session */
  curl_handle = curl_easy_init();
}

WebGet::~WebGet ()
{
  /* cleanup curl stuff */
  curl_easy_cleanup(curl_handle);
}

long WebGet::urlToFile (const string &url, const string &filename)
{
  FILE *file;

  /* specify URL to get */
  curl_easy_setopt(curl_handle, CURLOPT_URL, url.c_str ());

  /* send all data to this function */
  curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION,
                        writeFileCallback);
  /* open the files */
  file = fopen(filename.c_str (), "w");
  if (file == NULL)
  {
    curl_easy_cleanup(curl_handle);
    return -1;
  }

  curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *) file);

  /* some servers don't like requests that are made without a user-agent
     field, so we provide one */
  curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
  
  /* get it! */
  curl_easy_perform(curl_handle);
  
  long httpResponse;
  curl_easy_getinfo( curl_handle , CURLINFO_HTTP_CODE , &httpResponse );

  fclose (file);
  
  return httpResponse;
}

My current solution is to run urlToFile() in a loop with multiple
files. I would like to download multiple files at the same time. So my
question is how to do that?

Before I ask many stupid question perhaps you could sketch me how to
design an application that is able to download multiple files at the
same time.

regards
Andreas
Received on 2007-12-12