SFTP Resume Download

Demonstrates how to resume an SFTP download from a previous partial download.

Download Chilkat SSH / SFTP ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATSSHLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
sftp: TChilkatSFtp;
success: Integer;
port: Integer;
hostname: String;
remoteFilePath: String;
localFilePath: String;

begin
//  Important: It is helpful to send the contents of the
//  sftp.LastErrorText property when requesting support.

sftp := TChilkatSFtp.Create(Self);

//  Any string automatically begins a fully-functional 30-day trial.
success := sftp.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;

//  Set some timeouts, in milliseconds:
sftp.ConnectTimeoutMs := 5000;
sftp.IdleTimeoutMs := 10000;

//  Connect to the SSH server.
//  The standard SSH port = 22
//  The hostname may be a hostname or IP address.

hostname := 'www.my-ssh-server.com';
port := 22;
success := sftp.Connect(hostname,port);
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;

//  Authenticate with the SSH server.  Chilkat SFTP supports
//  both password-based authenication as well as public-key
//  authentication.  This example uses password authenication.
success := sftp.AuthenticatePw('myLogin','myPassword');
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;

//  After authenticating, the SFTP subsystem must be initialized:
success := sftp.InitializeSftp();
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;

//  Download the file:

localFilePath := 'c:/temp/hamlet.xml';
remoteFilePath := 'subdir1/subdir2/hamlet.xml';
//  The ResumeDownloadFileByName method will check
//  the local file and begin downloading the remote file
//  at the appropriate point.  For example, if the local
//  file is already 215624 bytes long, it will begin downloading
//  the remote file at the 215625'th byte -- appending to
//  the local file.
success := sftp.ResumeDownloadFileByName(remoteFilePath,localFilePath);
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;

ShowMessage('Success.');
end;