Pascal (Lazarus/Delphi)

FTP Download Binary File to a Stream

See more FTP Examples

Demonstrates how to FTP download a binary file to a Chilkat stream.

Note: This example requires Chilkat v9.5.0.67 or greater.

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.FileAccess,
  Chilkat.Task,
  Chilkat.BinData,
  Chilkat.Ftp2,
  Chilkat.Stream;

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

procedure RunDemo;
var
  success: Boolean;
  ftp: TFtp2;
  fac: TFileAccess;
  streamObj: TStream;
  t: TTask;
  bd: TBinData;

begin
  success := False;

  //  This example assumes the Chilkat FTP2 API to have been previously unlocked.
  //  See FTP2 Unlock Sample for sample code.

  ftp := TFtp2.Create;

  ftp.Hostname := 'www.my-ftp-server.com';
  ftp.Username := 'mFtpLogin';
  ftp.Password := 'myFtpPassword';
  ftp.AuthTls := True;
  ftp.Passive := True;

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

  //  We'll read the incoming data chunk-by-chunk and write to an output file.
  fac := TFileAccess.Create;
  success := fac.OpenForWrite('qa_output/penguins2.jpg');
  if (success <> True) then
    begin
      WriteLn(fac.LastErrorText);
      Exit;
    end;

  streamObj := TStream.Create;

  //  Create a task to do the FTP download.
  t := ftp.GetFileToStreamAsync('penguins2.jpg',streamObj);
  if (ftp.LastMethodSuccess <> True) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  //  Start the task in a background thread.
  t.Run();

  bd := TBinData.Create;
  while streamObj.EndOfStream <> True do
    begin
      //  Get the next chunk of JPG bytes.
      streamObj.ReadBd(bd);
      //  Do something with it..
      //  In this simple example, we'll just write to the file.
      fac.FileWriteBd(bd,0,0);
      //  Clear for the next read.
      bd.Clear();
    end;

  fac.FileClose();

  t.Free;

  WriteLn('Success.');


  ftp.Free;
  fac.Free;
  streamObj.Free;
  bd.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.