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.Sock ets.NetworkStre am.Write(Byte[] buffer, Int32 offset, Int32
size)
at System.Net.FtpD ataStream.Write (Byte[] buffer, Int32 offset, Int32
size)
at HSMoveFiles.FTP Client.Upload(F ileInfo fi, String targetFilename) in
C:\DOTNET\HSMov eFiles\FTPClien t.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(conten t, 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.Collecti ons.Generic;
using System;
using System.Net;
using System.IO;
using System.Runtime. Remoting.Lifeti me;
using System.Text.Reg ularExpressions ;
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 "CONSTRUCTO RS"
/// <summary>
/// Blank constructor
/// </summary>
/// <remarks>Hostna me, 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(strin g 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(strin g 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
ListDirectoryDe tail</remarks>
public List<stringList Directory(strin g directory)
{
//return a simple list of filenames in directory
System.Net.FtpW ebRequest ftp = GetRequest(GetD irectory(direct ory));
//Set request to do simple list
ftp.Method = System.Net.WebR equestMethods.F tp.ListDirector y;
string str = GetStringRespon se(ftp);
//replace CRLF to CR, remove last instance
str = str.Replace("\r \n", "\r").TrimEnd(' \r');
//split the string into a list
List<stringresu lt = 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 ListDirectoryDe tail(string directory)
{
System.Net.FtpW ebRequest ftp = GetRequest(GetD irectory(direct ory));
//Set request to do simple list
ftp.Method = System.Net.WebR equestMethods.F tp.ListDirector yDetails;
string str = GetStringRespon se(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(st r, _lastDirectory) ;
}
#endregion
#region "Upload: File transfer TO ftp server"
/// <summary>
/// Copy a local file to the FTP server
/// </summary>
/// <param name="localFile name">Full path of the local file</param>
/// <param name="targetFil ename">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(l ocalFilename))
{
throw (new ApplicationExce ption("File " + localFilename + " not found"));
}
//copy to FI
FileInfo fi = new FileInfo(localF ilename);
return Upload(fi, targetFilename) ;
}
/// <summary>
/// Upload a local file to the FTP server
/// </summary>
/// <param name="fi">Sourc e file</param>
/// <param name="targetFil ename">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.CurrentDir ectory + fi.Name;
}
else if (targetFilename .Contains("/"))
{
//If contains / treat as a full path
target = AdjustDir(targe tFilename);
}
else
{
//otherwise treat as filename only, use current directory
target = CurrentDirector y + targetFilename;
}
string URI = Hostname + target;
//perform copy
System.Net.FtpW ebRequest ftp = GetRequest(URI) ;
//Set request to upload a file in binary
ftp.Method = System.Net.WebR equestMethods.F tp.UploadFile;
ftp.UseBinary = true;
//Notify FTP of the expected size
ftp.ContentLeng th = 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.GetRequestS tream())
{
do
{
dataRead = fs.Read(content , 0, BufferSize);
rs.Write(conten t, 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="sourceFil ename">Target filename, if required</param>
/// <param name="localFile name">Full path of the local file</param>
/// <returns></returns>
/// <remarks>Targ et 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(localF ilename);
return this.Download(s ourceFilename, fi, PermitOverwrite );
}
//Version taking an FtpFileInfo
public bool Download(FTPfil eInfo file, string localFilename, bool
PermitOverwrite )
{
return this.Download(f ile.FullName, localFilename, PermitOverwrite );
}
//Another version taking FtpFileInfo and FileInfo
public bool Download(FTPfil eInfo file, FileInfo localFI, bool
PermitOverwrite )
{
return this.Download(f ile.FullName, localFI, PermitOverwrite );
}
//Version taking string/FileInfo
public bool Download(string sourceFilename, FileInfo targetFI, bool
PermitOverwrite )
{
//1. check target
if (targetFI.Exist s && !(PermitOverwri te))
{
throw (new ApplicationExce ption("Target file already exists"));
}
//2. check source
string target;
if (sourceFilename .Trim() == "")
{
throw (new ApplicationExce ption("File not specified"));
}
else if (sourceFilename .Contains("/"))
{
//treat as a full path
target = AdjustDir(sourc eFilename);
}
else
{
//treat as filename only, use current directory
target = CurrentDirector y + sourceFilename;
}
string URI = Hostname + target;
//3. perform copy
System.Net.FtpW ebRequest ftp = GetRequest(URI) ;
//Set request to download a file in binary mode
ftp.Method = System.Net.WebR equestMethods.F tp.DownloadFile ;
ftp.UseBinary = true;
//open request and get response stream
using (FtpWebResponse response = (FtpWebResponse )ftp.GetRespons e())
{
using (Stream responseStream = response.GetRes ponseStream())
{
//loop to read & write to file
using (FileStream fs = targetFI.OpenWr ite())
{
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(strin g filename)
{
//Determine if file or full path
string URI = this.Hostname + GetFullPath(fil ename);
System.Net.FtpW ebRequest ftp = GetRequest(URI) ;
//Set request to delete
ftp.Method = System.Net.WebR equestMethods.F tp.DeleteFile;
try
{
//get response but ignore it
string str = GetStringRespon se(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(s tring filename)
{
//Try to obtain filesize: if we get error msg containing "550"
//the file does not exist
try
{
long size = GetFileSize(fil ename);
return true;
}
catch (Exception ex)
{
//only handle expected not-found exception
if (ex is System.Net.WebE xception)
{
//file does not exist/no rights error = 550
if (ex.Message.Con tains("550"))
{
//clear
return false;
}
else
{
throw;
}
}
else
{
throw;
}
}
}
/// <summary>
/// Determine size of remote file
/// </summary>
/// <param name="filename" ></param>
/// <returns></returns>
/// <remarks>Thro ws an exception if file does not exist</remarks>
public long GetFileSize(str ing filename)
{
string path;
if (filename.Conta ins("/"))
{
path = AdjustDir(filen ame);
}
else
{
path = this.CurrentDir ectory + filename;
}
string URI = this.Hostname + path;
System.Net.FtpW ebRequest ftp = GetRequest(URI) ;
//Try to get info on file/dir?
ftp.Method = System.Net.WebR equestMethods.F tp.GetFileSize;
string tmp = this.GetStringR esponse(ftp);
return GetSize(ftp);
}
public bool FtpRename(strin g sourceFilename, string newName)
{
//Does file exist?
string source = GetFullPath(sou rceFilename);
if (!FtpFileExists (source))
{
throw (new FileNotFoundExc eption("File " + source + " not found"));
}
//build target name, ensure it does not exist
string target = GetFullPath(new Name);
if (target == source)
{
throw (new ApplicationExce ption("Source and target are the same"));
}
else if (FtpFileExists( target))
{
throw (new ApplicationExce ption("Target file " + target + " already
exists"));
}
//perform rename
string URI = this.Hostname + source;
System.Net.FtpW ebRequest ftp = GetRequest(URI) ;
//Set request to delete
ftp.Method = System.Net.WebR equestMethods.F tp.Rename;
ftp.RenameTo = target;
try
{
//get response but ignore it
string str = GetStringRespon se(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
public bool FtpCreateDirect ory(string dirpath)
{
//perform create
string URI = this.Hostname + AdjustDir(dirpa th);
System.Net.FtpW ebRequest ftp = GetRequest(URI) ;
//Set request to MkDir
ftp.Method = System.Net.WebR equestMethods.F tp.MakeDirector y;
try
{
//get response but ignore it
string str = GetStringRespon se(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
public bool FtpDeleteDirect ory(string dirpath)
{
//perform remove
string URI = this.Hostname + AdjustDir(dirpa th);
System.Net.FtpW ebRequest ftp = GetRequest(URI) ;
//Set request to RmDir
ftp.Method = System.Net.WebR equestMethods.F tp.RemoveDirect ory;
try
{
//get response but ignore it
string str = GetStringRespon se(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(stri ng URI)
{
//create request
FtpWebRequest result = (FtpWebRequest) FtpWebRequest.C reate(URI);
//Set the login details
result.Credenti als = GetCredentials( );
//Do not keep alive (stateless mode)
result.KeepAliv e = true;
return result;
}
/// <summary>
/// Get the credentials from username/password
/// </summary>
private System.Net.ICre dentials GetCredentials( )
{
return new System.Net.Netw orkCredential(U sername, Password);
}
/// <summary>
/// returns a full path using CurrentDirector y for a relative file reference
/// </summary>
private string GetFullPath(str ing file)
{
if (file.Contains( "/"))
{
return AdjustDir(file) ;
}
else
{
return this.CurrentDir ectory + file;
}
}
/// <summary>
/// Amend an FTP path so that it always starts with /
/// </summary>
/// <param name="path">Pat h to adjust</param>
/// <returns></returns>
/// <remarks></remarks>
private string AdjustDir(strin g path)
{
return ((path.StartsWi th("/")) ? "" : "/").ToString () + path;
}
private string GetDirectory(st ring directory)
{
string URI;
if (directory == "")
{
//build from current
URI = Hostname + this.CurrentDir ectory;
_lastDirectory = this.CurrentDir ectory;
}
else
{
if (!directory.Sta rtsWith("/"))
{
throw (new ApplicationExce ption("Director y 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">curr ent FTP request</param>
/// <returns>Stri ng 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 GetStringRespon se(FtpWebReques t ftp)
{
//Get the result, streaming to a string
string result = "";
using (FtpWebResponse response = (FtpWebResponse )ftp.GetRespons e())
{
long size = response.Conten tLength;
using (Stream datastream = response.GetRes ponseStream())
{
using (StreamReader sr = new StreamReader(da tastream))
{
result = sr.ReadToEnd();
sr.Close();
}
datastream.Clos e();
}
response.Close( );
}
return result;
}
/// <summary>
/// Gets the size of an FTP request
/// </summary>
/// <param name="ftp"></param>
/// <returns></returns>
/// <remarks></remarks>
private long GetSize(FtpWebR equest ftp)
{
long size;
using (FtpWebResponse response = (FtpWebResponse )ftp.GetRespons e())
{
size = response.Conten tLength;
response.Close( );
}
return size;
}
#endregion
#region "Properties "
private string _hostname;
/// <summary>
/// Hostname
/// </summary>
/// <value></value>
/// <remarks>Hostna me can be in either the full URL format
/// ftp://ftp.myhost.com or just ftp.myhost.com
/// </remarks>
public string Hostname
{
get
{
if (_hostname.Star tsWith("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 CurrentDirector y value
/// </summary>
/// <remarks>Defaul ts to the root '/'</remarks>
private string _currentDirecto ry = "/";
public string CurrentDirector y
{
get
{
//return directory, ensure it ends with /
return _currentDirecto ry + ((_currentDirec tory.EndsWith("/")) ? "" :
"/").ToString ();
}
set
{
if (!value.StartsW ith("/"))
{
throw (new ApplicationExce ption("Director y should start with /"));
}
_currentDirecto ry = 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 DirectoryEntryT ypes 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.L astIndexOf(".") ;
if (i >= 0 && i < (this.Filename. Length - 1))
{
return this.Filename.S ubstring(i + 1);
}
else
{
return "";
}
}
}
public string NameOnly
{
get
{
int i = this.Filename.L astIndexOf(".") ;
if (i 0)
{
return this.Filename.S ubstring(0, i);
}
else
{
return this.Filename;
}
}
}
private string _filename;
private string _path;
private DirectoryEntryT ypes _fileType;
private long _size;
private DateTime _fileDateTime;
private string _permission;
#endregion
/// <summary>
/// Identifies entry as either File or Directory
/// </summary>
public enum DirectoryEntryT ypes
{
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">Pat h of the directory</param>
/// <remarks></remarks>
public FTPfileInfo(str ing line, string path)
{
//parse line
Match m = GetMatchingRege x(line);
if (m == null)
{
//failed
throw (new ApplicationExce ption("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.Group s["size"].Value);
_permission = m.Groups["permission "].Value;
string _dir = m.Groups["dir"].Value;
if (_dir != "" && _dir != "-")
{
_fileType = DirectoryEntryT ypes.Directory;
}
else
{
_fileType = DirectoryEntryT ypes.File;
}
try
{
_fileDateTime = DateTime.Parse( m.Groups["timestamp"].Value);
}
catch (Exception)
{
_fileDateTime = Convert.ToDateT ime(null);
}
}
}
private Match GetMatchingRege x(string line)
{
Regex rx;
Match m;
for (int i = 0; i <= _ParseFormats.L ength - 1; i++)
{
rx = new Regex(_ParseFor mats[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+(?<timesta mp>\\w+\\s+\\d+ \\s+\\d{4})\\s+ (?<name>.+)",
"(?<dir>[\\-d])(?<permission> ([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\ s+\\d+\\s+(?<si ze>\\d+)\\s+(?< timestamp>\\w+\ \s+\\d+\\s+\\d{ 4})\\s+(?<name> .+)",
"(?<dir>[\\-d])(?<permission> ([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\ s+\\d+\\s+(?<si ze>\\d+)\\s+(?< timestamp>\\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+(?<timesta mp>\\w+\\s+\\d+ \\s+\\d{1,2}:\\ d{2})\\s+(?<nam e>.+)",
"(?<dir>[\\-d])(?<permission> ([\\-r][\\-w][\\-xs]){3})(\\s+)(?<s ize>(\\d+))(\\s +)(?<ctbit>(\\w +\\s\\w+))(\\s+ )(?<size2>(\\d+ ))\\s+(?<timest amp>\\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<FTPfileInf o>
{
public FTPdirectory()
{
//creates a blank directory listing
}
/// <summary>
/// Constructor: create list from a (detailed) directory string
/// </summary>
/// <param name="dir">dire ctory listing string</param>
/// <param name="path"></param>
/// <remarks></remarks>
public FTPdirectory(st ring dir, string path)
{
foreach (string line in dir.Replace("\n ",
"").Split(Syste m.Convert.ToCha r('\r')))
{
//parse
if (line != "")
{
this.Add(new FTPfileInfo(lin e, path));
}
}
}
/// <summary>
/// Filter out only files from directory listing
/// </summary>
/// <param name="ext">opti onal file extension filter</param>
/// <returns>FTPdir ectory listing</returns>
public FTPdirectory GetFiles(string ext)
{
return this.GetFileOrD ir(FTPfileInfo. DirectoryEntryT ypes.File, ext);
}
/// <summary>
/// Returns a list of only subdirectories
/// </summary>
/// <returns>FTPDir ectory list</returns>
/// <remarks></remarks>
public FTPdirectory GetDirectories( )
{
return this.GetFileOrD ir(FTPfileInfo. DirectoryEntryT ypes.Directory, "");
}
//internal: share use function for GetDirectories/Files
private FTPdirectory GetFileOrDir(FT PfileInfo.Direc toryEntryTypes 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(stri ng filename)
{
foreach (FTPfileInfo ftpfile in this)
{
if (ftpfile.Filena me == filename)
{
return true;
}
}
return false;
}
private const char slash = '/';
public static string GetParentDirect ory(string dir)
{
string tmp = dir.TrimEnd(sla sh);
int i = tmp.LastIndexOf (slash);
if (i 0)
{
return tmp.Substring(0 , i - 1);
}
else
{
throw (new ApplicationExce ption("No parent for root"));
}
}
}
#endregion
}
