hi i write method which must to know that is size of specified directory i get response from server which contains flags of file name size and other info and on the different ftp servers format of answer is different how to know format of answer?

unsigned long long  GetFtpDirSize(String^ ftpDir) {
unsigned long long  size = 0;
int j = 0;
StringBuilder^ result = gcnew StringBuilder();
StreamReader^ reader;
FtpWebRequest^ reqFTP;
reqFTP = (FtpWebRequest^)FtpWebRequest::Create(gcnew Uri(ftpDir));
reqFTP->UseBinary = true;
reqFTP->Credentials = gcnew NetworkCredential("anonymous", "123");
reqFTP->Method = WebRequestMethods::Ftp::ListDirectoryDetails;
reqFTP->KeepAlive = false;
reqFTP->UsePassive = false;
try {
    WebResponse^ resp = reqFTP->GetResponse();
    Encoding^ code;
    code = Encoding::GetEncoding(1251);
    reader = gcnew StreamReader(resp->GetResponseStream(), code);
    String^ line = reader->ReadToEnd();
    array<Char>^delimiters = gcnew array<Char>{
        '\r', '\n'
    };
    array<Char>^delimiters2 = gcnew array<Char>{
        ' '
    };
    array<String^>^words = line->Split(delimiters, StringSplitOptions::RemoveEmptyEntries);
    array<String^>^DetPr;
    System::Collections::IEnumerator^ myEnum = words->GetEnumerator();
    while ( myEnum->MoveNext() ) {
        String^ word = safe_cast<String^>(myEnum->Current);
        DetPr = word->Split(delimiters2);
   }
}