关于使用libcurl实现文件上传的一些困惑，请大家帮忙

[snmhm1991]

为了实现文件上传到服务器我使用了以下代码：

 	curl_global_init(CURL_GLOBAL_ALL);
 	CURL* hCurl = curl_easy_init();
 	if(hCurl != NULL)
 	{
 		curl_slist* pOptionList = NULL;
 		int filesize=0;
		pOptionList = curl_slist_append(pOptionList, "Blog-X-User: username");
 		pOptionList = curl_slist_append(pOptionList, "Expect:");
 		curl_easy_setopt(hCurl, CURLOPT_HTTPHEADER, pOptionList);
 
 		curl_httppost* pFormPost = NULL;
 		curl_httppost* pLastElem = NULL;
 		//上传文件，指定本地文件完整路径
 		curl_formadd(&pFormPost, &pLastElem, CURLFORM_COPYNAME, "sendfile", CURLFORM_FILE, "D:\\a.png"/*, CURLFORM_CONTENTTYPE, "application/octet-stream"*/, CURLFORM_END);
 		curl_formadd(&pFormPost, &pLastElem, CURLFORM_COPYNAME, "filename", CURLFORM_COPYCONTENTS, "a.png", CURLFORM_END);
 		curl_formadd(&pFormPost,&pLastElem,CURLFORM_COPYNAME, "submit",CURLFORM_COPYCONTENTS, "send",

 		curl_easy_setopt(hCurl, CURLOPT_HTTPPOST, pFormPost);
 		curl_easy_setopt(hCurl, CURLOPT_URL, "http://XXXX.com/UploadFileServlet");
//  		curl_easy_setopt(hCurl, CURLOPT_HEADERFUNCTION,function);
 // 		curl_easy_setopt(hCurl, CURLOPT_FOLLOWLOCATION,1);
 // 		curl_easy_setopt(hCurl, CURLOPT_HEADERDATA, &filesize);
 
 		CURLcode res = curl_easy_perform(hCurl);
 
		double t=0;
		curl_easy_getinfo(hCurl,CURLINFO_SIZE_UPLOAD,&t); 

 		if(res != CURLE_OK)
 		{
 //			std::cout << "Error" << std::endl;
 		}
 
 		curl_formfree(pFormPost);
 		curl_easy_cleanup(hCurl);
 	}
 
 	curl_global_cleanup();

使用上面的代码上传文件是否可行？然后还有更重要的一个问题就是，我如何才能获取到我上传文件所在的URL地址？libcurl是否会返回这个我需要的地址？