FTP Factory

This code is written by Jaimon Mathew.

The author's code is very useful, and I referenced it blow, and added the function of get file date, returned to string type.

When use this class:

public static void main ()
{
FTPFactory ff = new FTPFactory();
ff.setDebug(true);
ff.setRemoteHost(remotehost);
ff.setRemoteUser(remoteuser);
ff.setRemotePass(remotepass);
ff.login();
ff.chdir(chdir);
ff.setBinaryMode(true);

string filename=@"myfile.txt";
ff.GetFileDate(filename);
...
...
}

Attach Jaimon Mathew's code(with the part of public string GetFileDate(string fileName) method I adde) below:

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;


namespace FTPDownload
{
public class FTPFactory
{

private string remoteHost, remotePath, remoteUser, remotePass, mes;
private int remotePort, bytes;
private Socket clientSocket;

private int retValue;
private Boolean debug;
private Boolean logined;
private string reply;

private static int BLOCK_SIZE = 512;

Byte[] buffer = new Byte[BLOCK_SIZE];
Encoding ASCII = Encoding.ASCII;

public FTPFactory()
{

remoteHost = "localhost";
remotePath = ".";
remoteUser = "anonymous";
remotePass = "jaimon@school2000.co.uk";
remotePort = 21;
debug = false;
logined = false;

}

//
// Set the name of the FTP server to connect to.
//
// Server name
public void setRemoteHost(string remoteHost)
{
this.remoteHost = remoteHost;
}

//
// Return the name of the current FTP server.
//
// Server name
public string getRemoteHost()
{
return remoteHost;
}

//
// Set the port number to use for FTP.
//
// Port number
public void setRemotePort(int remotePort)
{
this.remotePort = remotePort;
}

//
// Return the current port number.
//
// Current port number
public int getRemotePort()
{
return remotePort;
}

//
// Set the remote directory path.
//
// The remote directory path
public void setRemotePath(string remotePath)
{
this.remotePath = remotePath;
}

//
// Return the current remote directory path.
//
// The current remote directory path.
public string getRemotePath()
{
return remotePath;
}

//
// Set the user name to use for logging into the remote server.
//
// Username
public void setRemoteUser(string remoteUser)
{
this.remoteUser = remoteUser;
}

//
// Set the password to user for logging into the remote server.
//
// Password
public void setRemotePass(string remotePass)
{
this.remotePass = remotePass;
}

//
// Return a string array containing the remote directory's file list.
//
//
//
public string[] getFileList(string mask)
{

if (!logined)
{
login();
}

Socket cSocket = createDataSocket();

sendCommand("NLST " + mask);

if (!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}

mes = "";

while (true)
{

int bytes = cSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);

if (bytes < buffer.Length)
{
break;
}
}

char[] seperator = { '\n' };
string[] mess = mes.Split(seperator);

cSocket.Close();

readReply();

if (retValue != 226)
{
throw new IOException(reply.Substring(4));
}
return mess;

}

//Changed Dec 03,2008
public string GetFileDate(string fileName)
{
//if (!logined)
//{
// login();
//}

//sendCommand("MDTM " + fileName);

//if (retValue != 213)
//{
// throw new Exception(reply);
//}

//return this.reply.ToString();

if (null == fileName)
{
throw new ArgumentException("No file name specified");
}
if (fileName.Length <= 0)
{
throw new ArgumentException("No file name specified");
}


string returnDate = DateTime.MinValue.ToString();

if (!logined)
{
login();
}

sendCommand("MDTM " + fileName);


if (retValue == 213)
{
//Console.WriteLine(reply.ToString());
//size = Int64.Parse(reply.Substring(4));
returnDate = this.reply.ToString();
}
else
{
throw new IOException(reply.Substring(4));
}

Console.WriteLine(returnDate + " " + returnDate);
return returnDate.ToString();
}
//private DateTime ConvertFTPDateToDateTime(string input)
//{

// //yyyyMMddhhmmss":

// string dateInfo = input.Substring(4);
// dateInfo = dateInfo.Substring(0, 14);
// int year = Convert.ToInt16(dateInfo.Substring(0, 4));
// int month = Convert.ToInt16(dateInfo.Substring(4, 2));
// int day = Convert.ToInt16(dateInfo.Substring(6, 2));
// int hour = Convert.ToInt16(dateInfo.Substring(8, 2));
// int min = Convert.ToInt16(dateInfo.Substring(10, 2));
// int sec = Convert.ToInt16(dateInfo.Substring(12, 2));

// return new DateTime(year, month, day, hour, min, sec);
//}

//
// Return the size of a file.
//
//
//
public long getFileSize(string fileName)
{

if (!logined)
{
login();
}

sendCommand("SIZE " + fileName);
long size = 0;

if (retValue == 213)
{
size = Int64.Parse(reply.Substring(4));
}
else
{
throw new IOException(reply.Substring(4));
}

return size;

}

//
// Login to the remote server.
//
public void login()
{

clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new IPEndPoint(Dns.GetHostEntry(remoteHost).AddressList[0], remotePort);

try
{
clientSocket.Connect(ep);
}
catch (Exception)
{
throw new IOException("Couldn't connect to remote server");
}

readReply();
if (retValue != 220)
{
close();
throw new IOException(reply.Substring(4));
}
if (debug)
Console.WriteLine("USER " + remoteUser);

sendCommand("USER " + remoteUser);

if (!(retValue == 331 || retValue == 230))
{
cleanup();
throw new IOException(reply.Substring(4));
}

if (retValue != 230)
{
if (debug)
Console.WriteLine("PASS xxx");

sendCommand("PASS " + remotePass);
if (!(retValue == 230 || retValue == 202))
{
cleanup();
throw new IOException(reply.Substring(4));
}
}

logined = true;
Console.WriteLine("Connected to " + remoteHost);

chdir(remotePath);

}

//
// If the value of mode is true, set binary mode for downloads.
// Else, set Ascii mode.
//
//
public void setBinaryMode(Boolean mode)
{

if (mode)
{
sendCommand("TYPE I");
}
else
{
sendCommand("TYPE A");
}
if (retValue != 200)
{
throw new IOException(reply.Substring(4));
}
}

//
// Download a file to the Assembly's local directory,
// keeping the same file name.
//
//
public void download(string remFileName)
{
download(remFileName, "", false);
}

//
// Download a remote file to the Assembly's local directory,
// keeping the same file name, and set the resume flag.
//
//
//
public void download(string remFileName, Boolean resume)
{
download(remFileName, "", resume);
}

//
// Download a remote file to a local file name which can include
// a path. The local file name will be created or overwritten,
// but the path must exist.
//
//
//
public void download(string remFileName, string locFileName)
{
download(remFileName, locFileName, false);
}

//
// Download a remote file to a local file name which can include
// a path, and set the resume flag. The local file name will be
// created or overwritten, but the path must exist.
//
//
//
//
public void download(string remFileName, string locFileName, Boolean resume)
{
if (!logined)
{
login();
}

setBinaryMode(true);

Console.WriteLine("Downloading file " + remFileName + " from " + remoteHost + "/" + remotePath);

if (locFileName.Equals(""))
{
locFileName = remFileName;
}

if (!File.Exists(locFileName))
{
Stream st = File.Create(locFileName);
st.Close();
}

FileStream output = new FileStream(locFileName, FileMode.Open);

Socket cSocket = createDataSocket();

long offset = 0;

if (resume)
{

offset = output.Length;

if (offset > 0)
{
sendCommand("REST " + offset);
if (retValue != 350)
{
//throw new IOException(reply.Substring(4));
//Some servers may not support resuming.
offset = 0;
}
}

if (offset > 0)
{
if (debug)
{
Console.WriteLine("seeking to " + offset);
}
long npos = output.Seek(offset, SeekOrigin.Begin);
Console.WriteLine("new pos=" + npos);
}
}

sendCommand("RETR " + remFileName);

if (!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}

while (true)
{

bytes = cSocket.Receive(buffer, buffer.Length, 0);
output.Write(buffer, 0, bytes);

if (bytes <= 0)
{
break;
}
}

output.Close();
if (cSocket.Connected)
{
cSocket.Close();
}

Console.WriteLine("");

readReply();

if (!(retValue == 226 || retValue == 250))
{
throw new IOException(reply.Substring(4));
}

}

//
// Upload a file.
//
//
public void upload(string fileName)
{
upload(fileName, false);
}

//
// Upload a file and set the resume flag.
//
//
//
public void upload(string fileName, Boolean resume)
{

if (!logined)
{
login();
}

Socket cSocket = createDataSocket();
long offset = 0;

if (resume)
{

try
{

setBinaryMode(true);
offset = getFileSize(fileName);

}
catch (Exception)
{
offset = 0;
}
}

if (offset > 0)
{
sendCommand("REST " + offset);
if (retValue != 350)
{
//throw new IOException(reply.Substring(4));
//Remote server may not support resuming.
offset = 0;
}
}

sendCommand("STOR " + Path.GetFileName(fileName));

if (!(retValue == 125 || retValue == 150))
{
throw new IOException(reply.Substring(4));
}

// open input stream to read source file
FileStream input = new FileStream(fileName, FileMode.Open);

if (offset != 0)
{

if (debug)
{
Console.WriteLine("seeking to " + offset);
}
input.Seek(offset, SeekOrigin.Begin);
}

Console.WriteLine("Uploading file " + fileName + " to " + remotePath);

while ((bytes = input.Read(buffer, 0, buffer.Length)) > 0)
{

cSocket.Send(buffer, bytes, 0);

}
input.Close();

Console.WriteLine("");

if (cSocket.Connected)
{
cSocket.Close();
}

readReply();
if (!(retValue == 226 || retValue == 250))
{
throw new IOException(reply.Substring(4));
}
}

//
// Delete a file from the remote FTP server.
//
//
public void deleteRemoteFile(string fileName)
{

if (!logined)
{
login();
}

sendCommand("DELE " + fileName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

//
// Rename a file on the remote FTP server.
//
//
//
public void renameRemoteFile(string oldFileName, string newFileName)
{

if (!logined)
{
login();
}

sendCommand("RNFR " + oldFileName);

if (retValue != 350)
{
throw new IOException(reply.Substring(4));
}

// known problem
// rnto will not take care of existing file.
// i.e. It will overwrite if newFileName exist
sendCommand("RNTO " + newFileName);
if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

//
// Create a directory on the remote FTP server.
//
//
public void mkdir(string dirName)
{

if (!logined)
{
login();
}

sendCommand("MKD " + dirName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

//
// Delete a directory on the remote FTP server.
//
//
public void rmdir(string dirName)
{

if (!logined)
{
login();
}

sendCommand("RMD " + dirName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

//
// Change the current working directory on the remote FTP server.
//
//
public void chdir(string dirName)
{

if (dirName.Equals("."))
{
return;
}

if (!logined)
{
login();
}

sendCommand("CWD " + dirName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

this.remotePath = dirName;

Console.WriteLine("Current directory is " + remotePath);

}

//
// Close the FTP connection.
//
public void close()
{

if (clientSocket != null)
{
sendCommand("QUIT");
}

cleanup();
Console.WriteLine("Closing...");
}

//
// Set debug mode.
//
//
public void setDebug(Boolean debug)
{
this.debug = debug;
}

private void readReply()
{
mes = "";
reply = readLine();
retValue = Int32.Parse(reply.Substring(0, 3));
}

private void cleanup()
{
if (clientSocket != null)
{
clientSocket.Close();
clientSocket = null;
}
logined = false;
}

private string readLine()
{

while (true)
{
bytes = clientSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);
if (bytes < buffer.Length)
{
break;
}
}

char[] seperator = { '\n' };
string[] mess = mes.Split(seperator);

if (mes.Length > 2)
{
mes = mess[mess.Length - 2];
}
else
{
mes = mess[0];
}

if (!mes.Substring(3, 1).Equals(" "))
{
return readLine();
}

if (debug)
{
for (int k = 0; k < mess.Length - 1; k++)
{
Console.WriteLine(mess[k]);
}
}
return mes;
}

private void sendCommand(String command)
{

Byte[] cmdBytes = Encoding.ASCII.GetBytes((command + "\r\n").ToCharArray());
clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
readReply();
}

private Socket createDataSocket()
{

sendCommand("PASV");

if (retValue != 227)
{
throw new IOException(reply.Substring(4));
}

int index1 = reply.IndexOf('(');
int index2 = reply.IndexOf(')');
string ipData = reply.Substring(index1 + 1, index2 - index1 - 1);
int[] parts = new int[6];

int len = ipData.Length;
int partCount = 0;
string buf = "";

for (int i = 0; i < len && partCount <= 6; i++)
{

char ch = Char.Parse(ipData.Substring(i, 1));
if (Char.IsDigit(ch))
buf += ch;
else if (ch != ',')
{
throw new IOException("Malformed PASV reply: " + reply);
}

if (ch == ',' || i + 1 == len)
{

try
{
parts[partCount++] = Int32.Parse(buf);
buf = "";
}
catch (Exception)
{
throw new IOException("Malformed PASV reply: " + reply);
}
}
}

string ipAddress = parts[0] + "." + parts[1] + "." +
parts[2] + "." + parts[3];

int port = (parts[4] << 8) + parts[5];

Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new IPEndPoint(Dns.GetHostEntry(ipAddress).AddressList[0], port);

try
{
s.Connect(ep);
}
catch (Exception)
{
throw new IOException("Can't connect to remote server");
}

return s;
}

}
}