I have a FTP (Filezila server), and I would like to download a large file on it, using c#.
WebClient client = new WebClient();
client.Credentials = new NetworkCredential(userName, password);
client.DownloadFile(new Uri("ftp://XXX.XXX.XXX.XXX/" + fileName), destinationFileFullPath);
or
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://XXX.XXX.XXX.XXX/" + fileName);
request.Method = WebRequestMethods.Ftp.DownloadFile;
request.KeepAlive = true; // I tried both
request.UseBinary = true; // I tried both
request.UsePassive = true;
request.Credentials = new NetworkCredential(userName, password);
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
// Writing bytes to local files
using (var outputStream = File.OpenWrite(destinationFileFullPath))
{
byte[] chunk = new byte[2048];
int bytesRead;
do
{
bytesRead = responseStream.Read(chunk, 0, chunk.Length);
outputStream.Write(chunk, 0, bytesRead);
} while (bytesRead > 0);
outputStream.Flush();
}
responseStream.Close();
response.Close();
For small file, it works well, but for large file (by large I mean around ~300MB and more) it works, but at the end of the transfer (I see on filezilla server side that the transfer is a success) for an unknown reason my app just hang on the line
client.DownloadFile(new Uri("ftp://XXX.XXX.XXX.XXX/" + fileName), destinationFileFullPath);
or
bytesRead = responseStream.Read(chunk, 0, chunk.Length);
until I got a timeout exception. If I force the break (pause) I can see that is really stuck on this line. It is like if Filezilla close the connection and C# just wait more to read...
Did you already experienced this issue?
Thanks for your help.
I'm using the code bellow to upload a zip file to to my ftp server:
string zipPath = #"d:\files\start.zip";
string ftpPath = ("ftp://######/start.zip");
WebRequest request = WebRequest.Create(ftpPath);
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential("######", "######");
StreamReader sourceStream = new StreamReader(zipPath);
byte[] fileContents = Encoding.Unicode.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
try
{
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse makeFileUploadResponse = (FtpWebResponse)request.GetResponse();
}
catch
{
MessageBox.Show("ftp failed!");
}
My zip archive is definitely valid (I can open it and extract it) but when I download the uploaded zip file, I got the error that archive is damaged.
Update 1: my source code is from MSDN article:How to: Upload Files with FTP
you should cast request to FtpWebRequest (as in that MSDN example)
and then specify request as binary (you're uploading binary file, not text).
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("aa");
request.Method = WebRequestMethods.Ftp.UploadFile;
request.UseBinary = true;
I can't say what the problem is but I can provide an alternate solution. You can use WebClient instead of WebRequest
string zipPath = #"d:\files\start.zip";
string ftpPath = ("ftp://######/start.zip");
WebClient ftpClient = new WebClient();
ftpClient.Credentials = new NetworkCredential("####", "######");
try{
ftpClient.UploadFile(ftpPath, WebRequestMethods.Ftp.AppendFile, zipPath);
}
catch(WebException ex){
MessageBox.Show("ftp failed");
}
Two questions here :
1)difference between WebRequestMethods.Ftp.uploadfile and WebRequestMethods.Ftp.uploadfilewithuniquename?
2)When i do an upload file using the code below for an already existing file would it override the file.And is it safe to assume that it would always override?
public static void Main ()
{
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://www.contoso.com/test.htm");
request.Method = WebRequestMethods.Ftp.UploadFile;
// what if i use request.Method = WebRequestMethods.Ftp.UploadFilewithuniquename;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential ("anonymous","janeDoe#contoso.com");
// Copy the contents of the file to the request stream.
StreamReader sourceStream = new StreamReader("testfile.txt");
byte [] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);
response.Close();
}
These methods refer to the FTP commands STOR and STOU.
If the logged in user has the privs, then STOR (WebRequestMethods.Ftp.UploadFile) will create a new file or overwrite an existing file.
The following code is intended to retrieve a file via FTP. However, I'm getting an error with it.
serverPath = "ftp://x.x.x.x/tmp/myfile.txt";
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverPath);
request.KeepAlive = true;
request.UsePassive = true;
request.UseBinary = true;
request.Method = WebRequestMethods.Ftp.DownloadFile;
request.Credentials = new NetworkCredential(username, password);
// Read the file from the server & write to destination
using (FtpWebResponse response = (FtpWebResponse)request.GetResponse()) // Error here
using (Stream responseStream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(responseStream))
using (StreamWriter destination = new StreamWriter(destinationFile))
{
destination.Write(reader.ReadToEnd());
destination.Flush();
}
The error is:
The remote server returned an error: (550) File unavailable (e.g., file not found, no access)
The file definitely does exist on the remote machine and I am able to perform this ftp manually (i.e. I have permissions). Can anyone tell me why I might be getting this error?
I know this is an old Post but I am adding here for future reference. Here is a solution that I found:
private void DownloadFileFTP()
{
string inputfilepath = #"C:\Temp\FileName.exe";
string ftphost = "xxx.xx.x.xxx";
string ftpfilepath = "/Updater/Dir1/FileName.exe";
string ftpfullpath = "ftp://" + ftphost + ftpfilepath;
using (WebClient request = new WebClient())
{
request.Credentials = new NetworkCredential("UserName", "P#55w0rd");
byte[] fileData = request.DownloadData(ftpfullpath);
using (FileStream file = File.Create(inputfilepath))
{
file.Write(fileData, 0, fileData.Length);
file.Close();
}
MessageBox.Show("Download Complete");
}
}
Updated based upon excellent suggestion by Ilya Kogan
Easiest way
The most trivial way to download a binary file from an FTP server using .NET framework is using WebClient.DownloadFile:
WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.DownloadFile(
"ftp://ftp.example.com/remote/path/file.zip", #"C:\local\path\file.zip");
Advanced options
Use FtpWebRequest, only if you need a greater control, that WebClient does not offer (like TLS/SSL encryption, progress monitoring, ascii/text transfer mode, resuming transfers, etc). Easy way is to just copy an FTP response stream to FileStream using Stream.CopyTo:
FtpWebRequest request =
(FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(#"C:\local\path\file.zip"))
{
ftpStream.CopyTo(fileStream);
}
Progress monitoring
If you need to monitor a download progress, you have to copy the contents by chunks yourself:
FtpWebRequest request =
(FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(#"C:\local\path\file.zip"))
{
byte[] buffer = new byte[10240];
int read;
while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, read);
Console.WriteLine("Downloaded {0} bytes", fileStream.Position);
}
}
For GUI progress (WinForms ProgressBar), see:
FtpWebRequest FTP download with ProgressBar
Downloading folder
If you want to download all files from a remote folder, see
C# Download all files and subdirectories through FTP.
This paragraph from the FptWebRequest class reference might be of interest to you:
The URI may be relative or absolute.
If the URI is of the form
"ftp://contoso.com/%2fpath" (%2f is
an escaped '/'), then the URI is
absolute, and the current directory is
/path. If, however, the URI is of the
form "ftp://contoso.com/path", first
the .NET Framework logs into the FTP
server (using the user name and
password set by the Credentials
property), then the current directory
is set to /path.
I had the same issue!
My solution was to insert the public_html folder into the download URL.
Real file location on the server:
myhost.com/public_html/myimages/image.png
Web URL:
www.myhost.com/myimages/image.png
private static DataTable ReadFTP_CSV()
{
String ftpserver = "ftp://servername/ImportData/xxxx.csv";
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpserver));
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream responseStream = response.GetResponseStream();
// use the stream to read file from FTP
StreamReader sr = new StreamReader(responseStream);
DataTable dt_csvFile = new DataTable();
#region Code
//Add Code Here To Loop txt or CSV file
#endregion
return dt_csvFile;
}
I hope it can help you.
public void download(string remoteFile, string localFile)
{
private string host = "yourhost";
private string user = "username";
private string pass = "passwd";
private FtpWebRequest ftpRequest = null;
private FtpWebResponse ftpResponse = null;
private Stream ftpStream = null;
private int bufferSize = 2048;
try
{
ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + remoteFile);
ftpRequest.Credentials = new NetworkCredential(user, pass);
ftpRequest.UseBinary = true;
ftpRequest.UsePassive = true;
ftpRequest.KeepAlive = true;
ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;
ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
ftpStream = ftpResponse.GetResponseStream();
FileStream localFileStream = new FileStream(localFile, FileMode.Create);
byte[] byteBuffer = new byte[bufferSize];
int bytesRead = ftpStream.Read(byteBuffer, 0, bufferSize);
try
{
while (bytesRead > 0)
{
localFileStream.Write(byteBuffer, 0, bytesRead);
bytesRead = ftpStream.Read(byteBuffer, 0, bufferSize);
}
}
catch (Exception) { }
localFileStream.Close();
ftpStream.Close();
ftpResponse.Close();
ftpRequest = null;
}
catch (Exception) { }
return;
}
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverPath);
After this you may use the below line to avoid error..(access denied etc.)
request.Proxy = null;
FYI, Microsoft recommends not using FtpWebRequest for new development:
We don't recommend that you use the FtpWebRequest class for new development. For more information and alternatives to FtpWebRequest, see WebRequest shouldn't be used on GitHub.
The GitHub link directs to this SO page which contains a list of third-party FTP libraries, such as FluentFTP.
I am trying to stream a multiline textbox into a text file on an ftp server. Can someone tell me where I may be going wrong?
private void btnSave_Click(object sender, EventArgs e)
{
UriBuilder b = new UriBuilder();
b.Host = "ftp.myserver.com";
b.UserName = "user";
b.Password = "pass";
b.Port = 21;
b.Path = "/myserver.com/directories/" + selected + ".txt";
b.Scheme = Uri.UriSchemeFtp;
Uri g = b.Uri;
System.Net.FtpWebRequest c = (System.Net.FtpWebRequest)System.Net.FtpWebRequest.Create(g);
c.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
System.Net.FtpWebResponse d = (System.Net.FtpWebResponse)c.GetResponse();
System.IO.Stream h = d.GetResponseStream;
System.IO.StreamWriter SW = new System.IO.StreamWriter(h);
String[] contents = textBox1.Lines.ToArray();
for (int i = 0; i < contents.Length; i++)
{
SW.WriteLine(contents[i]);
}
h.Close();
SW.Close();
d.Close();
}
The error I am getting is this line:
System.IO.StreamWriter SW = new System.IO.StreamWriter(h);
Stream was not writable.
Any ideas?
The response stream from an FTP site is data from the site to you. You'd need the request stream... but then you wouldn't want a method of DownloadFile - you're not downloading, you're uploading, so you want the UploadFile method.
Additionally:
You're not closing anything if exceptions are thrown: use using blocks for this.
It's a bad idea to do network access like this on the UI thread; the UI thread will block (so the whole UI will hang) while the FTP request is happening. Use a background thread instead.
To upload a file you need to use the FtpWebRequest class.
Quote:
When using an FtpWebRequest object to
upload a file to a server, you must
write the file content to the request
stream obtained by calling the
GetRequestStream method or its
asynchronous counterparts, the
BeginGetRequestStream and
EndGetRequestStream methods. You must
write to the stream and close the
stream before sending the request.
For an example of uploading a file (which you can change to writing stream content as in your example) see here.
Taken from MSDN and slightly modified:
public static bool UploadFileOnServer(string fileName, Uri serverUri)
{
// The URI described by serverUri should use the ftp:// scheme.
// It contains the name of the file on the server.
// Example: ftp://contoso.com/someFile.txt.
// The fileName parameter identifies the file
// to be uploaded to the server.
if (serverUri.Scheme != Uri.UriSchemeFtp)
{
return false;
}
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri);
request.Method = WebRequestMethods.Ftp.UploadFile;
StreamReader sourceStream = new StreamReader(fileName);
byte [] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential ("anonymous","janeDoe#contoso.com");
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse) request.GetResponse();
Console.WriteLine("Upload status: {0}",response.StatusDescription);
response.Close();
return true;
}