Authenticate() Method

Logs into the FTP server using configuration settings specified in Session.

Syntax

Visual Basic (Declaration)
Visual Basic (Usage)
C#
C++/CLI

Public Overloads Function Authenticate() As List(Of Response)

Dim instance As Ftp
Dim value As List(Of Response)
 
value = instance.Authenticate()

public List<Response> Authenticate()

public:
List<Response^>^ Authenticate();

Return Value

A List of Response objects generated.

Remarks

This method or Authenticate(String,String) should be used after Connect or Connect(String) (or another login techniques must be used).

FtpSession.Username, FtpSession.Password and FtpSession.Account are used for login purposes. SSL encryption is negotiated before logging in if Session.Security.EncryptionControl == EncryptionControl.Explicit.

Example

This example demonstrates using the FTP control to retrieve a file using the FTP GET command.

private void button1_Click(object sender, EventArgs e)
{
    //Wire up the FTP component's progress event to track the transfer's progress
    ftp1.Progress += new EventHandler<ProgressEventArgs>(ftp1_Progress);

    //Wire up the FTP component's error event to report errors
    ftp1.Error += new EventHandler<ErrorEventArgs>(ftp1_Error);

    //Setup the Ftp session and then connect, authenticate, and retrieve a file on a worker thread
    ftp1.Session.RemoteEndPoint.HostNameOrAddress = myServer;
    ftp1.Session.Username = myUsername;
    ftp1.Session.Password = myPassword;

    //The Start method executes the GET operation on a worker thread so the UI is not blocked.
    //Unhandled worker thread exceptions are automatically caught and marshaled to the Error event
    ftp1.Start(getFile, null);
}

private void getFile(object state)
{
    try
    {
        //Connect to the FTP Server.
        ftp1.Connect();

        //Authenticate the user.
        ftp1.Authenticate();

        //Retrieve a file.
        ftp1.Get("testfile.txt", myLocalDirectory + "\\testfile.txt", Synchronize.Off);
    }
    catch (Exception Ex)
    {
        //If an exception occurs, marshal it to the UI thread.
        ftp1.Marshal(Ex);
    }
    finally
    {
        //Close the connection.
        ftp1.Close();
    }
}

void ftp1_Progress(object sender, ProgressEventArgs e)
{
    //Transfer progress can be provided via this event, for a more complete
    //example of reporting progress, please see the Ftp Listview sample.

    //The file transfer is in progress.
    if (e.Item.Status == CopyStatus.InProgress)
    {
        if (e.Item.Count > 0)
        {
            //Update the progress of the transfer.
            progressBar1.Value = e.Item.Percentage;
        }
    }
    //The file transfer is complete.
    else if (e.Item.Status == CopyStatus.Completed)
    {
        //Reset the progressbar
        progressBar1.Value = 0;
    }
    //The file transfer was aborted or failed.
    else if (e.Item.Status == CopyStatus.Aborted || e.Item.Status == CopyStatus.Failed)
    {
        //Reset the progress bar
        progressBar1.Value = 0;

        //Report that the transfer has stopped.
        MessageBox.Show("The file transfer has failed or was aborted.", "The File transfer has stopped.", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

void ftp1_Error(object sender, ErrorEventArgs e)
{
    //Show a messagebox containg the exception.
    MessageBox.Show(e.GetException().ToString(), "An error has occurred.", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

Visual Basic

Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
    'Wire up the FTP component's progress event to track the transfer's progress
    AddHandler ftp1.Progress, AddressOf ftp1_Progress

    'Wire up the FTP component's error event to report errors
    AddHandler ftp1.Error, AddressOf ftp1_Error

    'Setup the Ftp session and then connect, authenticate, and retrieve a file on a worker thread
    ftp1.Session.RemoteEndPoint.HostNameOrAddress = myServer
    ftp1.Session.Username = myUsername
    ftp1.Session.Password = myPassword

    'The Start method executes the GET operation on a worker thread so the UI is not blocked.
    'Unhandled worker thread exceptions are automatically caught and marshaled to the Error event
    ftp1.Start(AddressOf getFile, Nothing)
End Sub

Private Sub getFile(ByVal state As Object)
    Try
        'Connect to the FTP Server.
        ftp1.Connect()

        'Authenticate the user.
        ftp1.Authenticate()

        'Retrieve a file.
        ftp1.Get("testfile.txt", myLocalDirectory & "\testfile.txt", Synchronize.Off)
    Catch Ex As Exception
        'If an exception occurs, marshal it to the UI thread.
        ftp1.Marshal(Ex)
    Finally
        'Close the connection.
        ftp1.Close()
    End Try
End Sub

Private Sub ftp1_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs)
    'Transfer progress can be provided via this event, for a more complete
    'example of reporting progress, please see the Ftp Listview sample.

    'The file transfer is in progress.
    If e.Item.Status = CopyStatus.InProgress Then
        If e.Item.Count > 0 Then
            'Update the progress of the transfer.
            progressBar1.Value = e.Item.Percentage
        End If
    'The file transfer is complete.
    ElseIf e.Item.Status = CopyStatus.Completed Then
        'Reset the progressbar
        progressBar1.Value = 0
    'The file transfer was aborted or failed.
    ElseIf e.Item.Status = CopyStatus.Aborted OrElse e.Item.Status = CopyStatus.Failed Then
        'Reset the progress bar
        progressBar1.Value = 0

        'Report that the transfer has stopped.
        MessageBox.Show("The file transfer has failed or was aborted.", "The File transfer has stopped.", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End If
End Sub

Private Sub ftp1_Error(ByVal sender As Object, ByVal e As ErrorEventArgs)
    'Show a messagebox containg the exception.
    MessageBox.Show(e.GetException().ToString(), "An error has occurred.", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Sub

Reference

Ftp Class
Ftp Members
Overload List