(Delphi ActiveX) Delete Local Files that Do Not Exist on the FTP Server

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

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TChilkatFtp2;
success: Integer;
mode: Integer;
descendTree: Integer;
previewOnly: Integer;
sa: TCkStringArray;
fac: TCkFileAccess;
numFiles: Integer;
i: Integer;
localFilePath: WideString;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

ftp := TChilkatFtp2.Create(Self);

ftp.Hostname := 'ftp.example.com';
ftp.Username := 'login';
ftp.Password := 'password';

ftp.KeepSessionLog := 1;

// Connect and login to the FTP server.
success := ftp.Connect();
if (success <> 1) then
  begin
    Memo1.Lines.Add(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 <> 1) then
  begin
    Memo1.Lines.Add(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 1.
mode := 1;
descendTree := 1;
previewOnly := 1;
success := ftp.SyncRemoteTree2('/temp/abc123',mode,descendTree,previewOnly);
if (success <> 1) then
  begin
    Memo1.Lines.Add(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 := TCkStringArray.Create(Self);
sa.LoadFromText(ftp.SyncPreview);

fac := TCkFileAccess.Create(Self);

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

while (i < numFiles) do
  begin
    localFilePath := sa.GetString(i);
    Memo1.Lines.Add(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 <> 1) then
      begin
        Memo1.Lines.Add('Failed to delete: ' + localFilePath);
      end;

    i := i + 1;
  end;

success := ftp.Disconnect();
end;