Hi !

First: I'am a newbie in programming with libcurl.

My Problem:
I want to use libcurl's multi interface for asynchronous data downloading
inside my ActiveX control which is embeded in a html document.

Yes I know. The win32 API provides also a downloading mechanism
(URLMonikers) which is documented as asyncronous. But it's syncronous... and
blocks my cotrol. That's bad and therefor I want to use libcurl.

When I use easy handles the writeDataCallback() is called correct. But If I
use multi handles the writeDataCallback() is not called. I set a breakpoint
inside writeDataCallback() but the debugger doesn't stop there (maybe the
multi interface is threaded).

I use VisualStudioC++6.0, downloaded/installed the libcurl package
(libcurl.dll, libcurl.lib) and openSSL package.

Here some code:

void startRequest()
{
  DataInfo* data1 = new DataInfo();
  CURLMcode code;

  curlHandle = curl_multi_init();

  CURL* curl1 = curl_easy_init();

  // set options
  curl_easy_setopt(curl1, CURLOPT_URL, "http://myserver/test.vsm");
  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

  do {
          code = curl_multi_perform(curlHandle, &runningHandles);
       }
  while (code == CURLM_CALL_MULTI_PERFORM);
}

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

// print debug info
OutputDebugString("writeDataCallback() \n");

  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;
}

Have anybody an idea what's going wrong ?

Thanks

-steve'o

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Received on 2004-05-21