Restart/Resume FTP Download

Resume downloading a file from an FTP server.

Download Chilkat FTP2 ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATFTP2Lib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TChilkatFtp2;
success: Integer;
localFilename: String;
remoteFilename: String;

begin
ftp := TChilkatFtp2.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := ftp.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);

  end;

ftp.Hostname := 'ftp.chilkatsoft.com';
ftp.Username := '****';
ftp.Password := '****';

//  Connect and login to the FTP server.
success := ftp.Connect();
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);

  end;

//  Change to the remote directory where the file is located.
//  This step is only necessary if the file is not in the root directory
//  for the FTP account.
success := ftp.ChangeRemoteDir('temp');
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);

  end;

//  To resume a download, it is assumed that the partial file
//  is already present on the local filesystem.
//  You only need to set the RestartNext property to resume
//  the download.  The Chilkat FTP component sets the resume
//  point by getting the existing size of the target (local) file.
ftp.RestartNext := 1;

localFilename := 'big.zip';
remoteFilename := 'big.zip';

//  Resume downloading...
success := ftp.GetFile(remoteFilename,localFilename);
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);

  end;

ftp.Disconnect();

ShowMessage('File Downloaded!');
end;