Pascal (Lazarus/Delphi)

Delete Local Files that Do Not Exist on the FTP Server

See more FTP Examples

Demonstrates how to get a list of local files in a directory tree that do not exist on the FTP server. 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.StringArray,
  Chilkat.Ftp2;

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

procedure RunDemo;
var
  success: Boolean;
  ftp: TFtp2;
  mode: Integer;
  descendTree: Boolean;
  previewOnly: Boolean;
  sa: TStringArray;
  fac: TFileAccess;
  numFiles: Integer;
  i: Integer;
  localFilePath: 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';

  ftp.KeepSessionLog := True;

  //  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 the root of
  //  the remote tree to be compared.
  success := ftp.ChangeRemoteDir('abc123');
  if (success <> True) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  //  Recursively descend the local directory tree
  //  and find the files that exist locally but not remotely.
  //  These are the files what would be uploaded via
  //  the SyncRemoteTree method call with mode = 1.
  //  (Mode 1 would upload all files that do not exist on the FTP server.)

  //  The actual uploading is avoided by setting the preview-only argument to True.
  mode := 1;
  descendTree := True;
  previewOnly := True;
  success := ftp.SyncRemoteTree2('/temp/abc123',mode,descendTree,previewOnly);
  if (success <> True) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  //  The files what would've been uploaded are now available in the SyncPreview property,
  //  which contains a list of local file paths, one per line.
  //  A program can iterate over them like this:
  sa := TStringArray.Create;
  sa.LoadFromText(ftp.SyncPreview);

  fac := TFileAccess.Create;

  numFiles := sa.Count;
  i := 0;

  while (i < numFiles) do
    begin
      localFilePath := sa.GetString(i);
      WriteLn(localFilePath);

      //  An application can delete the file using Chilkat's file access object,
      //  or it can choose to use the native file API available in the programming language:
      success := fac.FileDelete(localFilePath);
      if (success <> True) then
        begin
          WriteLn('Failed to delete: ' + localFilePath);
        end;

      i := i + 1;
    end;

  success := ftp.Disconnect();


  ftp.Free;
  sa.Free;
  fac.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.