Download files from SFTP with SSH NET library

Question

string host     ftphost   string username    user   string password               string localFileName    System IO Path GetFileName   localfilename    string remoteDirectory     export    using  var sftp   new SftpClient host  username  password         sftp Connect        var files   sftp ListDirectory remoteDirectory       foreach  var file in files                if   file Name StartsWith                             string remoteFileName   file Name              if  file LastWriteTime Date    DateTime Today               Console WriteLine file FullName                File OpenWrite localFileName                string sDir     localpath                Stream file1   File OpenRead remoteDirectory   file Name               sftp DownloadFile remoteDirectory  file1                       I am using SSH NET  Renci SshNet  library to work with an SFTP server  What I need to do is grab files from a specific folder on the SFTP server based on today s date  Then copy those files from the SFTP server to a local drive a server of mine   Above is the code I have but it is not working  Sometimes it says file does not exist but sometimes the files I will be downloading will not be on my local servers but I need to download whatever files were uploaded to the remote folder for that day   Can someone take a look and see what is wrong  I believe it has something to do with the stream portion  I have worked with FTP much besides uploading files which I took some previous code I had and thought I could reverse the process but that isn t working  The code I used is based off of this example

User · Answer

Without you providing any specific error message, it's hard to give specific suggestions.

However, I was using the same example and was getting a permissions exception on File.OpenWrite - using the localFileName variable, because using Path.GetFile was pointing to a location that obviously would not have permissions for opening a file > C:\ProgramFiles\IIS(Express)\filename.doc

I found that using System.IO.Path.GetFileName is not correct, use System.IO.Path.GetFullPath instead, point to your file starting with "C:\..."

Also open your solution in FileExplorer and grant permissions to asp.net for the file or any folders holding the file. I was able to download my file at that point.

User · Answer

This solves the problem on my end   var files   sftp ListDirectory remoteVendorDirectory  Where f   gt   f IsDirectory    foreach  var file in files        var filename      LocalDirectory   file Name        if   File Exists filename                 Console WriteLine  Downloading      file FullName           var localFile   File OpenWrite filename           sftp DownloadFile file FullName  localFile

User · Answer

While the example works  its not the correct way to handle the streams     You need to ensure the closing of the files streams with the using clause   Also  add try catch to handle IO errors            public void DownloadAll                 string host     sftp domain com           string username    myusername           string password    mypassword            string remoteDirectory     RemotePath            string localDirectory     C  LocalDriveFolder Downloaded             using  var sftp   new SftpClient host  username  password                         sftp Connect                var files   sftp ListDirectory remoteDirectory                foreach  var file in files                                string remoteFileName   file Name                  if    file Name StartsWith        amp  amp    file LastWriteTime Date    DateTime Today                        using  Stream file1   File OpenWrite localDirectory   remoteFileName                                                  sftp DownloadFile remoteDirectory   remoteFileName  file1

User · Answer

My version of  Merak Marey s Code  I am checking if files exist already and different download directories for  txt and other files          static void DownloadAll                 string host    xxx xxx xxx xxx           string username                  string password    123  string remoteDirectory     IN            string finalDir               string localDirectory     C  filesDN            string localDirectoryZip     C  filesDN ZIP            using  var sftp   new SftpClient host  username  password                         Console WriteLine  Connecting to     host     as     username               sftp Connect                Console WriteLine  Connected                 var files   sftp ListDirectory remoteDirectory                foreach  var file in files                                 string remoteFileName   file Name                   if    file Name StartsWith        amp  amp    file LastWriteTime Date    DateTime Today                                            if   file Name Contains   TXT                                                  finalDir   localDirectoryZip                                             else                                                finalDir   localDirectory                                              if  File Exists finalDir    file Name                                                 Console WriteLine  File     file Name     Exists                         else                          Console WriteLine  Downloading file      file Name                             using  Stream file1   File OpenWrite finalDir   remoteFileName                                                 sftp DownloadFile remoteDirectory   remoteFileName  file1                                                                                              Console ReadLine

User · Answer

A simple working code to download a file with SSH NET library is   using  Stream fileStream   File Create   C  target local path file zip          sftp DownloadFile   source remote path file zip   fileStream       See also Downloading a directory using SSH NET SFTP in C      To explain  why your code does not work   The second parameter of SftpClient DownloadFile is a stream to write a downloaded contents to   You are passing in a read stream instead of a write stream  And moreover the path you are opening read stream with is a remote path  what cannot work with File class operating on local files only   Just discard the File OpenRead line and use a result of previous File OpenWrite call instead  that you are not using at all now    Stream file1   File OpenWrite localFileName    sftp DownloadFile file FullName  file1     Or even better  use File Create to discard any previous contents that the local file may have   I m not sure if your localFileName is supposed to hold full path  or just file name  So you may need to add a path too  if necessary  combine localFileName with sDir

[c#] Download files from SFTP with SSH.NET library

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