code = curl_easy_setopt(ftp_handle, CURLOPT_URL, "ftp:127.0.0.1:990/");
code = curl_easy_setopt(ftp_handle, CURLOPT_USERNAME, "username");
code = curl_easy_setopt(ftp_handle, CURLOPT_PASSWORD, "password");
code = curl_easy_setopt(ftp_handle, CURLOPT_DIRLISTONLY, 1L);
/*
code = curl_easy_setopt(ftp_handle, CURLOPT_FTP_SSL_CCC, CURLFTPSSL_CCC_NONE);
code = curl_easy_setopt(ftp_handle, CURLOPT_SSL_VERIFYPEER, 1L);
code = curl_easy_setopt(ftp_handle, CURLOPT_SSL_VERIFYHOST, 2L);
code = curl_easy_setopt(ftp_handle, CURLOPT_FTPSSLAUTH, CURLFTPAUTH_TLS);
code = curl_easy_setopt(ftp_handle, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
*/
/*
code = curl_easy_setopt(ftp_handle, CURLOPT_TLSAUTH_TYPE, 1L);
code = curl_easy_setopt(ftp_handle, CURLOPT_TLSAUTH_USERNAME, "tms");
code = curl_easy_setopt(ftp_handle, CURLOPT_TLSAUTH_PASSWORD, "ewstms");
*/
/*
code = curl_easy_setopt(ftp_handle, CURLOPT_USE_SSL, CURLUSESSL_ALL);
*/
code = curl_easy_setopt(ftp_handle, CURLOPT_VERBOSE, 1L);
CURLcode res = curl_easy_perform(ftp_handle);
上面的代码，会一直在curl_easy_perform轮询，什么也没做，等到超时了才跳出来，不知道怎么弄
虽然我贴的是C++的代码，但我看到PHP也会用到libcurl(CURL)，所以来碰下运气
问题：
FTP服务器强制要求SSL认证登陆，
客户端的代码，应该如何设置选项? (curl_easy_setopt应该设置哪些内容)
网上找不到有用的资料，如果你刚好做过这个，希望给予帮助，谢谢
------解决方案--------------------
http://cgwxyz.blog.163.com/blog/static/2628060201202953249575/
------解决方案--------------------
…………………………不懂帮顶