Issue in Upload/download FTP file via Proxy C#.NET

naveenh · May 22nd, 2008, 06:27 PM

Subject: Issue in Upload/download FTP file via Proxy in ASP.NET 2.0 [C#]

Hello
How are you doing?

I am getting the following error when trying to FTP upload a file using FtpWebRequest via company proxy server.

"The requested FTP command is not supported when using HTTP proxy. "

Please suggest. as i am sure there should be a simple solution for this as it a very common proxy scenario

C# code is enclosed as below.

thanks

Naveen

using System.IO;
using System.Net;

namespace Bern.ISS.Web.Bloomberg
{
    public class requestproc
    {

        public requestproc()
        {
            this._ftpServer = ConfigurationManager.AppSettings["FTP.Server"];
            this._ftpPort = int.Parse(ConfigurationManager.AppSettings["FTP.Port"]);

            this._ftpUser = ConfigurationManager.AppSettings["FTP.User"];
            this._ftpPass = ConfigurationManager.AppSettings["FTP.Password"];
        }

        public static void SendRequest() //string filePath
        {
            try
            {
                string sFTPServer = "ftp://bfs.bloomberg.com/";
                string sRemoteFile = "eodpricing_I.req";
                string sURI = sFTPServer + sRemoteFile;
                string sReqFile = ConfigurationManager.AppSettings["Bloomberg.Draft.Path"] + "\\eodpricing_I.req";

                //Get the object used to communicate with the server
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(sFTPServer);

                //Set the proxy server login information
                WebProxy wproxy = new WebProxy("ftppxy.xyzcompany.com");
                wproxy.Credentials = new NetworkCredential("pxyuserid", "pxypasswd");
                request.Proxy = wproxy;
                //request.Proxy = null;

                //Use logon information
                request.Credentials = new NetworkCredential("bloomberguserid", "bloombergpwd");
                request.KeepAlive = false;
                request.UseBinary = true;
                request.UsePassive = true;

                request.Method = WebRequestMethods.Ftp.UploadFile;
// request.Method = WebRequestMethods.Ftp.DownloadFile;
// request.Method = WebRequestMethods.Ftp.MakeDirectory;

                // Copy the contents of the file to the request stream.
// StreamReader sourceStream = new StreamReader(sReqFile);
// byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
// sourceStream.Close();
// request.ContentLength = fileContents.Length;

                FileStream streamObj = File.OpenRead(sReqFile);
                byte[] buffer = new byte[streamObj.Length];
                streamObj.Close();
                streamObj = null;

                //Upload File to ftp://localHost/ set its object to nothing
                request.GetRequestStream().Write(buffer, 0, buffer.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();

            }
            catch (Exception exc)
            {
                throw exc;
                //throw new exception("Could not upload file to the FTP server.", exc);
            }
        }

    }
}

naveenh · May 26th, 2008, 10:50 PM

Hello

Anybody has any idea using the .NET class library to call ftp upload/download functionality through a company proxy server.

Please let me know as I am looking for a solution.
If not a native .NET class library functionality, then any information on any 3rd party component control that can do the needful,. i.e. Call FTP upload/download via a proxy server in an ASP.NET C# page.

Thanks

naveenh · May 27th, 2008, 02:54 PM

Hello

How are you doing?

I am looking for the following information to make a FTP call [via proxy] from a .NET program:

> The best practices followed for calling FTP through the corporate proxy server from a .NET C# Web page.
Currently I tried using System.Net class library [.NET 2.0] to call ftp upload/download functionality through proxy, without success.

> Do we have some kind of Internal built-in native .NET class library functionality that address this issue?

> If not, then do we have any 3rd party component control that can call FTP upload/download via a proxy server in an ASP.NET C# page.

> Does FTP Voyager provide a class library to programmatically call FTP via proxy.

> Provide specific FTP Contact links on the web for further details.

Please let me know as I am looking for a solution to finalize our market data needs.

Thanks

Doom · June 20th, 2008, 08:51 AM

Found this example off the net. Its a windows form application not a console application. it will give you a rough idea of the syntax.

Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
//Needed
using System.IO;
using System.Net;

namespace DownloadData
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void lbVCKicks_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            System.Diagnostics.Process.Start("http://vckicks.110mb.com");
        }

        private byte[] downloadedData;

        private void downloadData(string url)
        {
            WebClient downloadClient = new WebClient();

            downloadedData = new byte[0];
            try
            {
                //Optional
                this.Text = "Connecting...";
                Application.DoEvents();

                //Get a data stream from the url
                WebRequest req = WebRequest.Create(url);
                WebResponse response = req.GetResponse();
                Stream stream = response.GetResponseStream();

                //Download in chuncks
                byte[] buffer = new byte[1024];

                //Get Total Size
                string dataLengthString = response.Headers["Content-Length"];
                int dataLength = 0;
                if (dataLengthString != null)
                {
                    dataLength = Convert.ToInt32(dataLengthString);
                }

                //With the total data we can set up our progress indicators
                progressBar1.Maximum = dataLength;
                lbProgress.Text = "0/" + dataLength.ToString();

                this.Text = "Downloading...";
                Application.DoEvents();

                //Download
                MemoryStream memStream = new MemoryStream();
                while (true)
                {
                    //Try to read the data
                    int bytesRead = stream.Read(buffer, 0, buffer.Length);

                    if (bytesRead == 0)
                    {
                        //Finished downloading
                        progressBar1.Value = progressBar1.Maximum;
                        lbProgress.Text = dataLength.ToString() + "/" + dataLength.ToString();

                        Application.DoEvents();
                        break;
                    }
                    else
                    {
                        //Write the downloaded data
                        memStream.Write(buffer, 0, bytesRead);

                        //Update the progress bar
                        if (progressBar1.Value + bytesRead <= progressBar1.Maximum)
                        {
                            progressBar1.Value += bytesRead;
                            lbProgress.Text = progressBar1.Value.ToString() + "/" + dataLength.ToString();

                            progressBar1.Refresh();
                            Application.DoEvents();
                        }                        
                    }
                }

                //Convert the downloaded stream to a byte array
                downloadedData = memStream.ToArray();

                //Clean up
                stream.Close();
                memStream.Close();
            }
            catch (Exception)
            {
                MessageBox.Show("There was an error accessing the url");
            }

            txtData.Text = downloadedData.Length.ToString();
            this.Text = "Download Data";
        }

        private void btnDownload_Click(object sender, EventArgs e)
        {
            downloadData(txtUrl.Text);

            //We just want to extract the name for the save dialog
            if (downloadedData.Length != 0)
            {
                string urlName = txtUrl.Text;
                if (urlName.EndsWith("/"))
                    urlName = urlName.Substring(0, urlName.Length - 1); //Chop off the last '/'

                urlName = urlName.Substring(urlName.LastIndexOf('/') + 1);

                saveDiag1.FileName = urlName;
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            if (downloadedData.Length != 0)
            {
                if (saveDiag1.ShowDialog() == DialogResult.OK)
                {
                    this.Text = "Saving Data...";
                    Application.DoEvents();

                    //Write the bytes to a file
                    FileStream newFile = new FileStream(saveDiag1.FileName, FileMode.Create);
                    newFile.Write(downloadedData, 0, downloadedData.Length);
                    newFile.Close();

                    this.Text = "Download Data";
                    MessageBox.Show("Saved Successfully");
                }
            }
        }
    }
}

Here is the link for the snippet

http://vckicks.110mb.com/download_file_http.html