Hi !

I'am a newbie in libcurl and tried to use the multi interface of libcurl.

I want to pull several files from a server without blocking my application.
It's an ActiveX control embeded in html for running in IE. I know there are
also a win32 API, but it blocks !!

I followed the docs how to declare a writeDataCallback function.

Great, when I use an libcurl easy handle my callback function is called.
Using a multi handler the callback funtion is never called.

If I set an breakpoint into callback funtion the debugger is not stopped.
Maybe it's a problem of multi-threadig ?

Here a snipped code:

{
...
  DataInfo* data1 = new DataInfo();

  curlHandle = curl_multi_init();

  CURL* curl1 = curl_easy_init();

  // set options
  curl_easy_setopt(curl1, CURLOPT_URL, "http://myserver/dach_all.vsp");

  curl_easy_setopt(curl1, CURLOPT_WRITEFUNCTION, ::writeDataCallback);

  curl_easy_setopt(curl1, CURLOPT_WRITEDATA, (void *)data1);

  curl_easy_setopt(curl1, CURLOPT_PROXYAUTH, CURLAUTH_BASIC | CURLAUTH_NTLM
);

  // add easy handles to multi handle
  curl_multi_add_handle(curlHandle, curl1);

  // perform
  code = curl_multi_perform(curlHandle, &runningHandles);
}

and here the callback:

size_t writeDataCallback(void *buffer, size_t size, size_t nmemb, void
*userp)
{
int realsize = size * nmemb;

  DataInfo* info = (DataInfo*)userp;

  info->memory = (char *)realloc(info->memory, info->size + realsize + 1);

  if (info->memory)
   {
      memcpy(&(info->memory[info->size]), buffer, realsize);
      info->size += realsize;
      info->memory[info->size] = 0;
   }

  return realsize;
}

With an easy handle it works. Have anybody an idea ?

Thanks

-steve'o

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Received on 2004-05-19