Pascal (Lazarus/Delphi)

Restart/Resume FTP Upload

See more FTP Examples

Demonstrates how to restart / resume an FTP upload. 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 will be uploaded.
  success := ftp.ChangeRemoteDir('temp');
  if (success <> True) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  //  In this example, assume that a previous FTP upload failed,
  //  and the incomplete file (bigFile.zip) exists on the FTP server.
  //  You only need to set the RestartNext property to resume
  //  the upload.  When RestartNext is set, the next call
  //  to PutFile (or PutFileFromBinaryData, PutFileFromTextData)
  //  will automatically resume the upload from the point of failure.
  //  (The way it works is that the FTP component sends a "SIZE";
  //  command to the FTP server to find out how many bytes of
  //  the file already exist on the server.  It then begins
  //  uploading from that point.

  //  Note: After PutFile is called, the RestartNext property
  //  is automatically set to false.
  ftp.RestartNext := True;

  //  Upload a file with restart.
  localFilename := 'bigFile.zip';
  remoteFilename := 'bigFile.zip';

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

  success := ftp.Disconnect();

  WriteLn('File Uploaded!');


  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.