Download only the new file from FTP server

Zoltan Kerenyi

Hi,

Im trying to devise an algorithm for a remote FTP folder, since as far as I know it is not an easy task to mount a remote ftp in windows environment and c sharp.

So in every 2-3 minute I would log into the FTP shared folder (qnap) and search for the latest files and folders.

An event triggering is not possible since the remote shared folder is not mounted locally. So I would maintain a file list of the previous probe, and look for the difference, and only download the diff.

But the first obstacle is when listing the remote directory. 1 file is a string of attributes and the file name. Do you have a solution to this sproblem?

Thanks,

Zolee

here is the code so far:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://192.168.50.100/FolderA");
request.Credentials = new NetworkCredential("user", "pass");
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
request.KeepAlive = false;
request.UseBinary = true;
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
//List files = new List();
List<string> files = reader.ReadToEnd().Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).ToList();
reader.Close();
response.Close();
foreach (var item in files)
{
Console.WriteLine(item);

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sanjay Mrinal Kumar Kodangi5y ago
Accepted answer
Dear Zole,

I suggest you to maintain different folders for different states. Like New, Downloaded, Error.
New- All the new files will be dumped here.
Downloaded- You can write your program to download the file from New folder and once it is downloaded succesfully, you can move those specific files to downloaded folder.
Error- If any transaction error occurs and the download happen to fail, you can move them to error folder and take the necessary action
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Zoltan Kerenyi5y ago
Hi,

Very good idea, thanks. Im studiing the FluentFTP nuGet package which looks promising.
Do you think that an rsync could be implemented on top of ftp connection?

Rsync is a great tool in linux, I use it a lot, but now i gotta work out the same in windows environment.

Thanks,

Zolee

This is the code which is working right now:

static async void Syncronise()
{
//
string destination = @"C:\Temp";

using (FtpClient ftp = new FtpClient("192.168.50.100", 21, new NetworkCredential("user", "pass")))
{
await ftp.SetWorkingDirectoryAsync("FolderA");
FtpListItem[] items = await ftp.GetListingAsync();
ftp.Connect();
List rules = new List{ new FtpFolderNameRule(false, FtpFolderNameRule.CommonBlacklistedFolders)};

await ftp.DownloadDirectoryAsync(destination, "FolderA", FtpFolderSyncMode.Update, FtpLocalExists.Append, FtpVerify.Retry);
}
}

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