Pascal (Lazarus/Delphi)

File Existence Check

See more FTP Examples

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes. 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;
  fileSize: Integer;

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 := 'username';
  ftp.Password := 'password';

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

  //  Set the current remote directory to where the file is located:
  success := ftp.ChangeRemoteDir('something');
  if (success <> True) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  //  Test to see if the file exists by getting the file size by name. 
  //  If a -1 is returned, the file does not exist.
  fileSize := ftp.GetSizeByName('test123.txt');
  if (fileSize < 0) then
    begin
      WriteLn('file does not exist');
    end
  else
    begin
      WriteLn('file exists and is ' + fileSize + ' bytes in size');
    end;

  success := ftp.Disconnect();


  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.