Pascal (Lazarus/Delphi)

Restart/Resume FTP Download

See more FTP Examples

Resume downloading a file from an FTP server. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Ftp2;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  ftp: TFtp2;
  localFilename: string;
  remoteFilename: string;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  ftp := TFtp2.Create;

  ftp.Hostname := 'ftp.example.com';
  ftp.Username := 'login';
  ftp.Password := 'password';

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

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

  //  Resume downloading...
  success := ftp.GetFile(remoteFilename,localFilename);
  if (success <> True) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  success := ftp.Disconnect();

  WriteLn('File Downloaded!');


  ftp.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.