Pascal (Lazarus/Delphi)

SFTP Resume Download

See more SFTP Examples

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

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

procedure RunDemo;
var
  success: Boolean;
  sftp: TSFtp;
  hostname: string;
  port: Integer;
  remoteFilePath: string;
  localFilePath: string;

begin
  success := False;

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

  sftp := TSFtp.Create;

  //  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 := 'sftp.example.com';
  port := 22;
  success := sftp.Connect(hostname,port);
  if (success <> True) then
    begin
      WriteLn(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 <> True) then
    begin
      WriteLn(sftp.LastErrorText);
      Exit;
    end;

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

  WriteLn('Success.');


  sftp.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.