On Mon, 6 Oct 2008, Amit Nargund wrote:

> curl_formadd(&post, &last, CURLFORM_COPYNAME,
> fileelement.m_filename.utf8().data(),
> CURLFORM_FILE, file,

And here's the relevant quote from the fine manual:

CURLFORM_FILE
               followed by a filename, makes this part a file upload part.

"filename" being the keyword. You didn't provide one.

Also, your "working example" showed three different parts while you only add
one in this libcurl code.

> curl_easy_setopt(CurlHandle, CURLOPT_POSTFIELDSIZE, size);

This isn't needed and doesn't even do anything when you use CURLOPT_HTTPPOST.

> curl_easy_cleanup(CurlHandle); //free curl session
> curl_easy_setopt(d->m_handle, CURLOPT_POST, TRUE);

This looks like bad copy and paste.

And for more details on exactly what libcurl sends/receives, use
CURLOPT_DEBUGFUNCTION!

-- 
  / daniel.haxx.se