File Existence Check

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.

Download 32-bit Chilkat FTP2 ActiveX (.msi)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATFTP2Lib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TChilkatFtp2;
success: Integer;
fileSize: Integer;

begin
ftp := TChilkatFtp2.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := ftp.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);

  end;

ftp.Hostname := 'ftp.***.com';
ftp.Username := '***';
ftp.Password := '***';

//  Connect and login to the FTP server.
success := ftp.Connect();
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);

  end;

//  Set the current remote directory to where the file is located:
success := ftp.ChangeRemoteDir('/something');
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);

  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
    Memo1.Lines.Add('file does not exist');
  end
else
  begin
    Memo1.Lines.Add('file exists and is ' + IntToStr(fileSize)
         + ' bytes in size');
  end;

ftp.Disconnect();
end;