Friday, 11 January 2013

Download Files from Remote FTP Server to Local


Download Files from Remote FTP Server to Local


For being able to download all files from a FTP directory to a local folder, you will have to list 

all files in the remote directory and then download them one by one. You can use the 

following code to do the same:


Call this inside an Event for Example Button Click:


string[] files = GetFileList();

foreach (string file in files)


{


Download(file);


}


public string[] GetFileList()


{


string[] downloadFiles;


StringBuilder result = new StringBuilder();


WebResponse response = null;


StreamReader reader = null;


try


{


FtpWebRequest reqFTP;


reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/"));


reqFTP.UseBinary = true;


reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);


reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;


reqFTP.Proxy = null;


reqFTP.KeepAlive = false;


reqFTP.UsePassive = false;


response = reqFTP.GetResponse();


reader = new StreamReader(response.GetResponseStream());


string line = reader.ReadLine();


while (line != null)


{


result.Append(line);


result.Append("\n");


line = reader.ReadLine();


}


// to remove the trailing '\n'


result.Remove(result.ToString().LastIndexOf('\n'), 1);


return result.ToString().Split('\n');


}


catch (Exception ex)


{


if (reader != null)


{


reader.Close();


}


if (response != null)


{


response.Close();


}


downloadFiles = null;


return downloadFiles;


}


}



Method Used to achieve Downloading:


private void Download(string file)


{


try


{


string uri = "ftp://" + ftpServerIP + "/" + remoteDir + "/" + file;


Uri serverUri = new Uri(uri);


if (serverUri.Scheme != Uri.UriSchemeFtp)


{


return;


}


FtpWebRequest reqFTP;


reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" +

remoteDir + "/" + file));


reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);


reqFTP.KeepAlive = false;


reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;


reqFTP.UseBinary = true;


reqFTP.Proxy = null;


reqFTP.UsePassive = false;


FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();


Stream responseStream = response.GetResponseStream();


FileStream writeStream = new FileStream(localDestnDir + "\" + file, FileMode.Create);


int Length = 2048;


Byte[] buffer = new Byte[Length];


int bytesRead = responseStream.Read(buffer, 0, Length);


while (bytesRead > 0)


{


writeStream.Write(buffer, 0, bytesRead);


bytesRead = responseStream.Read(buffer, 0, Length);


}


writeStream.Close();


response.Close();


}


catch (WebException wEx)


{


MessageBox.Show(wEx.Message, "Download Error");


}


catch (Exception ex)


{


MessageBox.Show(ex.Message, "Download Error");


}


}

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