Hello,
I'm trying to upload a file programatically and occasionally I get the
following error message.
Unable to write data to the transport connection: An established connection
was aborted by the software in your host machine.
Stack Trace
at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32
size)
at System.Net.FtpDataStream.Write(Byte[] buffer, Int32 offset, Int32
size)
at HSMoveFiles.FTPClient.Upload(FileInfo fi, String targetFilename) in
C:\DOTNET\HSMoveFiles\FTPClient.cs:line 177
The source code for FTPClient.cs came from the following URL
http://www.codeproject.com/vb/net/FtpClient.asp
The exception is been thrown when trying to write the Stream.
rs.Write(content, 0, dataRead)
Has anyone got any Idea why this might happen and how to solve it?
Exception is caught at line number 185. Throw ex;.
Here is the source code. See line number 177.
using System.Collections.Generic;
using System;
using System.Net;
using System.IO;
using System.Runtime.Remoting.Lifetime;
using System.Text.RegularExpressions;
namespace HSMoveFiles
{
#region "FTP client class"
/// <summary>
/// A wrapper class for .NET 2.0 FTP
/// </summary>
/// <remarks>
/// This class does not hold open an FTP connection but
/// instead is stateless: for each FTP request it
/// connects, performs the request and disconnects.
/// </remarks>
public class FTPClient
{
#region "CONSTRUCTORS"
/// <summary>
/// Blank constructor
/// </summary>
/// <remarks>Hostname, username and password must be set manually</remarks>
public FTPClient()
{
}
/// <summary>
/// Constructor just taking the hostname
/// </summary>
/// <param name="Hostname">in either ftp://ftp.host.com or ftp.host.com
form</param>
/// <remarks></remarks>
public FTPClient(string Hostname)
{
_hostname = Hostname;
}
/// <summary>
/// Constructor taking hostname, username and password
/// </summary>
/// <param name="Hostname">in either ftp://ftp.host.com or ftp.host.com
form</param>
/// <param name="Username">Leave blank to use 'anonymous' but set password
to your email</param>
/// <param name="Password"></param>
/// <remarks></remarks>
public FTPClient(string Hostname, string Username, string Password)
{
_hostname = Hostname;
_username = Username;
_password = Password;
}
#endregion
#region "Directory functions"
/// <summary>
/// Return a simple directory listing
/// </summary>
/// <param name="directory">Directory to list, e.g. /pub</param>
/// <returns>A list of filenames and directories as a List(of
String)</returns>
/// <remarks>For a detailed directory listing, use
ListDirectoryDetail</remarks>
public List<stringListDirectory(string directory)
{
//return a simple list of filenames in directory
System.Net.FtpWebRequest ftp = GetRequest(GetDirectory(directory));
//Set request to do simple list
ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectory;
string str = GetStringResponse(ftp);
//replace CRLF to CR, remove last instance
str = str.Replace("\r\n", "\r").TrimEnd('\r');
//split the string into a list
List<stringresult = new List<string>();
result.AddRange(str.Split('\r'));
return result;
}
/// <summary>
/// Return a detailed directory listing
/// </summary>
/// <param name="directory">Directory to list, e.g. /pub/etc</param>
/// <returns>An FTPDirectory object</returns>
public FTPdirectory ListDirectoryDetail(string directory)
{
System.Net.FtpWebRequest ftp = GetRequest(GetDirectory(directory));
//Set request to do simple list
ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDeta ils;
string str = GetStringResponse(ftp);
//replace CRLF to CR, remove last instance
str = str.Replace("\r\n", "\r").TrimEnd('\r');
//split the string into a list
return new FTPdirectory(str, _lastDirectory);
}
#endregion
#region "Upload: File transfer TO ftp server"
/// <summary>
/// Copy a local file to the FTP server
/// </summary>
/// <param name="localFilename">Full path of the local file</param>
/// <param name="targetFilename">Target filename, if required</param>
/// <returns></returns>
/// <remarks>If the target filename is blank, the source filename is used
/// (assumes current directory). Otherwise use a filename to specify a name
/// or a full path and filename if required.</remarks>
public bool Upload(string localFilename, string targetFilename)
{
//1. check source
if (!File.Exists(localFilename))
{
throw (new ApplicationException("File " + localFilename + " not found"));
}
//copy to FI
FileInfo fi = new FileInfo(localFilename);
return Upload(fi, targetFilename);
}
/// <summary>
/// Upload a local file to the FTP server
/// </summary>
/// <param name="fi">Source file</param>
/// <param name="targetFilename">Target filename (optional)</param>
/// <returns></returns>
public bool Upload(FileInfo fi, string targetFilename)
{
//copy the file specified to target file: target file can be full path or
just filename (uses current dir)
//1. check target
string target;
if (targetFilename.Trim() == "")
{
//Blank target: use source filename & current dir
target = this.CurrentDirectory + fi.Name;
}
else if (targetFilename.Contains("/"))
{
//If contains / treat as a full path
target = AdjustDir(targetFilename);
}
else
{
//otherwise treat as filename only, use current directory
target = CurrentDirectory + targetFilename;
}
string URI = Hostname + target;
//perform copy
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to upload a file in binary
ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
ftp.UseBinary = true;
//Notify FTP of the expected size
ftp.ContentLength = fi.Length;
//create byte array to store: ensure at least 1 byte!
int BufferSize = 2048;
byte[] content = new byte[BufferSize - 1 + 1];
int dataRead;
//open file for reading
using (FileStream fs = fi.OpenRead())
{
try
{
//open request to send
using (Stream rs = ftp.GetRequestStream())
{
do
{
dataRead = fs.Read(content, 0, BufferSize);
rs.Write(content, 0, dataRead);
} while (!(dataRead < BufferSize));
rs.Close();
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
//ensure file closed
fs.Close();
ftp = null;
}
}
return true;
}
#endregion
#region "Download: File transfer FROM ftp server"
/// <summary>
/// Copy a file from FTP server to local
/// </summary>
/// <param name="sourceFilename">Target filename, if required</param>
/// <param name="localFilename">Full path of the local file</param>
/// <returns></returns>
/// <remarks>Target can be blank (use same filename), or just a filename
/// (assumes current directory) or a full path and filename</remarks>
public bool Download(string sourceFilename, string localFilename, bool
PermitOverwrite)
{
//2. determine target file
FileInfo fi = new FileInfo(localFilename);
return this.Download(sourceFilename, fi, PermitOverwrite);
}
//Version taking an FtpFileInfo
public bool Download(FTPfileInfo file, string localFilename, bool
PermitOverwrite)
{
return this.Download(file.FullName, localFilename, PermitOverwrite);
}
//Another version taking FtpFileInfo and FileInfo
public bool Download(FTPfileInfo file, FileInfo localFI, bool
PermitOverwrite)
{
return this.Download(file.FullName, localFI, PermitOverwrite);
}
//Version taking string/FileInfo
public bool Download(string sourceFilename, FileInfo targetFI, bool
PermitOverwrite)
{
//1. check target
if (targetFI.Exists && !(PermitOverwrite))
{
throw (new ApplicationException("Target file already exists"));
}
//2. check source
string target;
if (sourceFilename.Trim() == "")
{
throw (new ApplicationException("File not specified"));
}
else if (sourceFilename.Contains("/"))
{
//treat as a full path
target = AdjustDir(sourceFilename);
}
else
{
//treat as filename only, use current directory
target = CurrentDirectory + sourceFilename;
}
string URI = Hostname + target;
//3. perform copy
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to download a file in binary mode
ftp.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
ftp.UseBinary = true;
//open request and get response stream
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
using (Stream responseStream = response.GetResponseStream())
{
//loop to read & write to file
using (FileStream fs = targetFI.OpenWrite())
{
try
{
byte[] buffer = new byte[2048];
int read = 0;
do
{
read = responseStream.Read(buffer, 0, buffer.Length);
fs.Write(buffer, 0, read);
} while (!(read == 0));
responseStream.Close();
fs.Flush();
fs.Close();
}
catch (Exception)
{
//catch error and delete file only partially downloaded
fs.Close();
//delete target file as it's incomplete
targetFI.Delete();
throw;
}
}
responseStream.Close();
}
response.Close();
}
return true;
}
#endregion
#region "Other functions: Delete rename etc."
/// <summary>
/// Delete remote file
/// </summary>
/// <param name="filename">filename or full path</param>
/// <returns></returns>
/// <remarks></remarks>
public bool FtpDelete(string filename)
{
//Determine if file or full path
string URI = this.Hostname + GetFullPath(filename);
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to delete
ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
/// <summary>
/// Determine if file exists on remote FTP site
/// </summary>
/// <param name="filename">Filename (for current dir) or full path</param>
/// <returns></returns>
/// <remarks>Note this only works for files</remarks>
public bool FtpFileExists(string filename)
{
//Try to obtain filesize: if we get error msg containing "550"
//the file does not exist
try
{
long size = GetFileSize(filename);
return true;
}
catch (Exception ex)
{
//only handle expected not-found exception
if (ex is System.Net.WebException)
{
//file does not exist/no rights error = 550
if (ex.Message.Contains("550"))
{
//clear
return false;
}
else
{
throw;
}
}
else
{
throw;
}
}
}
/// <summary>
/// Determine size of remote file
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
/// <remarks>Throws an exception if file does not exist</remarks>
public long GetFileSize(string filename)
{
string path;
if (filename.Contains("/"))
{
path = AdjustDir(filename);
}
else
{
path = this.CurrentDirectory + filename;
}
string URI = this.Hostname + path;
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Try to get info on file/dir?
ftp.Method = System.Net.WebRequestMethods.Ftp.GetFileSize;
string tmp = this.GetStringResponse(ftp);
return GetSize(ftp);
}
public bool FtpRename(string sourceFilename, string newName)
{
//Does file exist?
string source = GetFullPath(sourceFilename);
if (!FtpFileExists(source))
{
throw (new FileNotFoundException("File " + source + " not found"));
}
//build target name, ensure it does not exist
string target = GetFullPath(newName);
if (target == source)
{
throw (new ApplicationException("Source and target are the same"));
}
else if (FtpFileExists(target))
{
throw (new ApplicationException("Target file " + target + " already
exists"));
}
//perform rename
string URI = this.Hostname + source;
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to delete
ftp.Method = System.Net.WebRequestMethods.Ftp.Rename;
ftp.RenameTo = target;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
public bool FtpCreateDirectory(string dirpath)
{
//perform create
string URI = this.Hostname + AdjustDir(dirpath);
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to MkDir
ftp.Method = System.Net.WebRequestMethods.Ftp.MakeDirectory;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
public bool FtpDeleteDirectory(string dirpath)
{
//perform remove
string URI = this.Hostname + AdjustDir(dirpath);
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to RmDir
ftp.Method = System.Net.WebRequestMethods.Ftp.RemoveDirectory;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
#endregion
#region "private supporting fns"
//Get the basic FtpWebRequest object with the
//common settings and security
private FtpWebRequest GetRequest(string URI)
{
//create request
FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
//Set the login details
result.Credentials = GetCredentials();
//Do not keep alive (stateless mode)
result.KeepAlive = true;
return result;
}
/// <summary>
/// Get the credentials from username/password
/// </summary>
private System.Net.ICredentials GetCredentials()
{
return new System.Net.NetworkCredential(Username, Password);
}
/// <summary>
/// returns a full path using CurrentDirectory for a relative file reference
/// </summary>
private string GetFullPath(string file)
{
if (file.Contains("/"))
{
return AdjustDir(file);
}
else
{
return this.CurrentDirectory + file;
}
}
/// <summary>
/// Amend an FTP path so that it always starts with /
/// </summary>
/// <param name="path">Path to adjust</param>
/// <returns></returns>
/// <remarks></remarks>
private string AdjustDir(string path)
{
return ((path.StartsWith("/")) ? "" : "/").ToString() + path;
}
private string GetDirectory(string directory)
{
string URI;
if (directory == "")
{
//build from current
URI = Hostname + this.CurrentDirectory;
_lastDirectory = this.CurrentDirectory;
}
else
{
if (!directory.StartsWith("/"))
{
throw (new ApplicationException("Directory should start with /"));
}
URI = this.Hostname + directory;
_lastDirectory = directory;
}
return URI;
}
//stores last retrieved/set directory
private string _lastDirectory = "";
/// <summary>
/// Obtains a response stream as a string
/// </summary>
/// <param name="ftp">current FTP request</param>
/// <returns>String containing response</returns>
/// <remarks>FTP servers typically return strings with CR and
/// not CRLF. Use respons.Replace(vbCR, vbCRLF) to convert
/// to an MSDOS string</remarks>
private string GetStringResponse(FtpWebRequest ftp)
{
//Get the result, streaming to a string
string result = "";
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
long size = response.ContentLength;
using (Stream datastream = response.GetResponseStream())
{
using (StreamReader sr = new StreamReader(datastream))
{
result = sr.ReadToEnd();
sr.Close();
}
datastream.Close();
}
response.Close();
}
return result;
}
/// <summary>
/// Gets the size of an FTP request
/// </summary>
/// <param name="ftp"></param>
/// <returns></returns>
/// <remarks></remarks>
private long GetSize(FtpWebRequest ftp)
{
long size;
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
size = response.ContentLength;
response.Close();
}
return size;
}
#endregion
#region "Properties"
private string _hostname;
/// <summary>
/// Hostname
/// </summary>
/// <value></value>
/// <remarks>Hostname can be in either the full URL format
/// ftp://ftp.myhost.com or just ftp.myhost.com
/// </remarks>
public string Hostname
{
get
{
if (_hostname.StartsWith("ftp://"))
{
return _hostname;
}
else
{
return "ftp://" + _hostname;
}
}
set
{
_hostname = value;
}
}
private string _username;
/// <summary>
/// Username property
/// </summary>
/// <value></value>
/// <remarks>Can be left blank, in which case 'anonymous' is
returned</remarks>
public string Username
{
get
{
return (_username == "" ? "anonymous" : _username);
}
set
{
_username = value;
}
}
private string _password;
public string Password
{
get
{
return _password;
}
set
{
_password = value;
}
}
/// <summary>
/// The CurrentDirectory value
/// </summary>
/// <remarks>Defaults to the root '/'</remarks>
private string _currentDirectory = "/";
public string CurrentDirectory
{
get
{
//return directory, ensure it ends with /
return _currentDirectory + ((_currentDirectory.EndsWith("/")) ? "" :
"/").ToString();
}
set
{
if (!value.StartsWith("/"))
{
throw (new ApplicationException("Directory should start with /"));
}
_currentDirectory = value;
}
}
#endregion
}
#endregion
#region "FTP file info class"
/// <summary>
/// Represents a file or directory entry from an FTP listing
/// </summary>
/// <remarks>
/// This class is used to parse the results from a detailed
/// directory list from FTP. It supports most formats of
/// </remarks>
public class FTPfileInfo
{
//Stores extended info about FTP file
#region "Properties"
public string FullName
{
get
{
return Path + Filename;
}
}
public string Filename
{
get
{
return _filename;
}
}
public string Path
{
get
{
return _path;
}
}
public DirectoryEntryTypes FileType
{
get
{
return _fileType;
}
}
public long Size
{
get
{
return _size;
}
}
public DateTime FileDateTime
{
get
{
return _fileDateTime;
}
}
public string Permission
{
get
{
return _permission;
}
}
public string Extension
{
get
{
int i = this.Filename.LastIndexOf(".");
if (i >= 0 && i < (this.Filename.Length - 1))
{
return this.Filename.Substring(i + 1);
}
else
{
return "";
}
}
}
public string NameOnly
{
get
{
int i = this.Filename.LastIndexOf(".");
if (i 0)
{
return this.Filename.Substring(0, i);
}
else
{
return this.Filename;
}
}
}
private string _filename;
private string _path;
private DirectoryEntryTypes _fileType;
private long _size;
private DateTime _fileDateTime;
private string _permission;
#endregion
/// <summary>
/// Identifies entry as either File or Directory
/// </summary>
public enum DirectoryEntryTypes
{
File,
Directory
}
/// <summary>
/// Constructor taking a directory listing line and path
/// </summary>
/// <param name="line">The line returned from the detailed directory
list</param>
/// <param name="path">Path of the directory</param>
/// <remarks></remarks>
public FTPfileInfo(string line, string path)
{
//parse line
Match m = GetMatchingRegex(line);
if (m == null)
{
//failed
throw (new ApplicationException("Unable to parse line: " + line));
}
else
{
_filename = m.Groups["name"].Value;
_path = path;
Int64.TryParse(m.Groups["size"].Value, out _size);
//_size = System.Convert.ToInt32(m.Groups["size"].Value);
_permission = m.Groups["permission"].Value;
string _dir = m.Groups["dir"].Value;
if (_dir != "" && _dir != "-")
{
_fileType = DirectoryEntryTypes.Directory;
}
else
{
_fileType = DirectoryEntryTypes.File;
}
try
{
_fileDateTime = DateTime.Parse(m.Groups["timestamp"].Value);
}
catch (Exception)
{
_fileDateTime = Convert.ToDateTime(null);
}
}
}
private Match GetMatchingRegex(string line)
{
Regex rx;
Match m;
for (int i = 0; i <= _ParseFormats.Length - 1; i++)
{
rx = new Regex(_ParseFormats[i]);
m = rx.Match(line);
if (m.Success)
{
return m;
}
}
return null;
}
#region "Regular expressions for parsing LIST results"
/// <summary>
/// List of REGEX formats for different FTP server listing formats
/// </summary>
/// <remarks>
/// The first three are various UNIX/LINUX formats, fourth is for MS FTP
/// in detailed mode and the last for MS FTP in 'DOS' mode.
/// I wish VB.NET had support for Const arrays like C# but there you go
/// </remarks>
private static string[] _ParseFormats = new string[] {
"(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\w+\\s+\\w+\\s+(?<size>\\d+)\\s+ (?<timestamp>\\w+\\s+\\d+\\s+\\d{4})\\s+(?<name>.+ )",
"(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\d+\\s+(?<size>\\d+)\\s+(?<times tamp>\\w+\\s+\\d+\\s+\\d{4})\\s+(?<name>.+)",
"(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\d+\\s+(?<size>\\d+)\\s+(?<times tamp>\\w+\\s+\\d+\\s+\\d{1,2}:\\d{2})\\s+(?<name>. +)",
"(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\w+\\s+\\w+\\s+(?<size>\\d+)\\s+ (?<timestamp>\\w+\\s+\\d+\\s+\\d{1,2}:\\d{2})\\s+( ?<name>.+)",
"(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})(\\s+)(?<size>(\\d+))(\\s+)(?<ctbit>(\\w+\\s\ \w+))(\\s+)(?<size2>(\\d+))\\s+(?<timestamp>\\w+\\ s+\\d+\\s+\\d{2}:\\d{2})\\s+(?<name>.+)",
"(?<timestamp>\\d{2}\\-\\d{2}\\-\\d{2}\\s+\\d{2}:\\d{2}[Aa|Pp][mM])\\s+(?<dir>\\<\\w+\\>){0,1}(?<size>\\d+){0,1}\\s+ (?<name>.+)"
};
#endregion
}
#endregion
#region "FTP Directory class"
/// <summary>
/// Stores a list of files and directories from an FTP result
/// </summary>
/// <remarks></remarks>
public class FTPdirectory : List<FTPfileInfo>
{
public FTPdirectory()
{
//creates a blank directory listing
}
/// <summary>
/// Constructor: create list from a (detailed) directory string
/// </summary>
/// <param name="dir">directory listing string</param>
/// <param name="path"></param>
/// <remarks></remarks>
public FTPdirectory(string dir, string path)
{
foreach (string line in dir.Replace("\n",
"").Split(System.Convert.ToChar('\r')))
{
//parse
if (line != "")
{
this.Add(new FTPfileInfo(line, path));
}
}
}
/// <summary>
/// Filter out only files from directory listing
/// </summary>
/// <param name="ext">optional file extension filter</param>
/// <returns>FTPdirectory listing</returns>
public FTPdirectory GetFiles(string ext)
{
return this.GetFileOrDir(FTPfileInfo.DirectoryEntryTypes. File, ext);
}
/// <summary>
/// Returns a list of only subdirectories
/// </summary>
/// <returns>FTPDirectory list</returns>
/// <remarks></remarks>
public FTPdirectory GetDirectories()
{
return this.GetFileOrDir(FTPfileInfo.DirectoryEntryTypes. Directory, "");
}
//internal: share use function for GetDirectories/Files
private FTPdirectory GetFileOrDir(FTPfileInfo.DirectoryEntryTypes type,
string ext)
{
FTPdirectory result = new FTPdirectory();
foreach (FTPfileInfo fi in this)
{
if (fi.FileType == type)
{
if (ext == "")
{
result.Add(fi);
}
else if (ext == fi.Extension)
{
result.Add(fi);
}
}
}
return result;
}
public bool FileExists(string filename)
{
foreach (FTPfileInfo ftpfile in this)
{
if (ftpfile.Filename == filename)
{
return true;
}
}
return false;
}
private const char slash = '/';
public static string GetParentDirectory(string dir)
{
string tmp = dir.TrimEnd(slash);
int i = tmp.LastIndexOf(slash);
if (i 0)
{
return tmp.Substring(0, i - 1);
}
else
{
throw (new ApplicationException("No parent for root"));
}
}
}
#endregion
}
