Getting file list on ftp server

Cem_Karaer · 2017-09-25

Hello, I want to get a list of files on FTP server giving a file pattern. For example I want to get a list of files matching following pattern: /matmaster/MATMASTER_*.CSV

Why do I want this? Because it is not allowed for us to make any file movement on the remote server. So we have to check none-downloaded files on the FTP and download if exists.

Is there any dotnet solution for this?

bbrown · 2017-09-25

Here's an example function I use to retrieve a list of files on a remote FTP site. The files are loaded to a temp table which can then be processed.

Hope this helps.

"FtpWebReques" is System.Net.FtpWebRequest.'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

FtpWebResponse is System.Net.FtpWebResponse.'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

--

LOCAL ListFTPFiles(SiteAddress : Text[250];Username : Text[30];PWD : Text[30];Path : Text)
FileCount := 0;
FilesToGet.RESET;
FilesToGet.DELETEALL;
FtpWebRequest := FtpWebRequest.Create('ftp://' + SiteAddress + '/' + Path);
FtpWebRequest.Credentials := NetworkCredential.NetworkCredential(Username, PWD);

FtpWebRequest.Method := 'NLST';
FtpWebRequest.KeepAlive := TRUE;
FtpWebRequest.UseBinary := TRUE;

FtpWebResponse := FtpWebRequest.GetResponse;
Stream := FtpWebResponse.GetResponseStream;

StreamReader := StreamReader.StreamReader(Stream);

WHILE NOT (StreamReader.EndOfStream) DO BEGIN
FileCount := FileCount + 1;
FilesToGet.INIT;
FilesToGet."Is a file" := TRUE;
FilesToGet.Name := StreamReader.ReadLine;
FilesToGet.INSERT;
END;

StreamReader.Close;
Stream.Close;
--

bbrown · 2017-09-25

Here's an example function I use to retrieve a list of files on a remote FTP site. The files are loaded to a temp table which can then be processed.

Hope this helps.

"FtpWebReques" is System.Net.FtpWebRequest.'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

FtpWebResponse is System.Net.FtpWebResponse.'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

--

LOCAL ListFTPFiles(SiteAddress : Text[250];Username : Text[30];PWD : Text[30];Path : Text)
FileCount := 0;
FilesToGet.RESET;
FilesToGet.DELETEALL;
FtpWebRequest := FtpWebRequest.Create('ftp://' + SiteAddress + '/' + Path);
FtpWebRequest.Credentials := NetworkCredential.NetworkCredential(Username, PWD);

FtpWebRequest.Method := 'NLST';
FtpWebRequest.KeepAlive := TRUE;
FtpWebRequest.UseBinary := TRUE;

FtpWebResponse := FtpWebRequest.GetResponse;
Stream := FtpWebResponse.GetResponseStream;

StreamReader := StreamReader.StreamReader(Stream);

WHILE NOT (StreamReader.EndOfStream) DO BEGIN
FileCount := FileCount + 1;
FilesToGet.INIT;
FilesToGet."Is a file" := TRUE;
FilesToGet.Name := StreamReader.ReadLine;
FilesToGet.INSERT;
END;

StreamReader.Close;
Stream.Close;
--

Cem_Karaer · 2017-09-27

@bbrown, thanks a lot. It seems good. I will try and post the result.

Cem_Karaer · 2017-10-02

Nice approach really, here is a link listing available options for FtpWebRequest.Method

https://msdn.microsoft.com/en-us/library/system.net.webrequestmethods.ftp_fields(v=vs.110).aspx

bbrown · 2017-10-03

https://en.wikipedia.org/wiki/List_of_FTP_commands

This provides a listing of the 4 character commands needed for the above process. Not all of the commands are supported. That, I think is just trial and error. I'm thinking only the RFC 959 commands are supported, but can't say for sure.

bbrown · 2017-10-03

Also note that I am using the assembly "System.Net.FtpWebRequest" and not "System.Net.WebRequestMethods".

Cem_Karaer · 2017-10-04

Hello, FtpWebRequest is derived from WebRequest and I think Method is not overriden in FtpWebRequest so the link is revelant actually.

Getting file list on ftp server

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