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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, FileAccess, StringArray, Ftp2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: HCkFtp2;
success: Boolean;
mode: Integer;
descendTree: Boolean;
previewOnly: Boolean;
sa: HCkStringArray;
fac: HCkFileAccess;
numFiles: Integer;
i: Integer;
localFilePath: PWideChar;

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

ftp := CkFtp2_Create();

CkFtp2_putHostname(ftp,'ftp.example.com');
CkFtp2_putUsername(ftp,'login');
CkFtp2_putPassword(ftp,'password');

CkFtp2_putKeepSessionLog(ftp,True);

// Connect and login to the FTP server.
success := CkFtp2_Connect(ftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

// Set the current remote directory to the root of
// the remote tree to be compared.
success := CkFtp2_ChangeRemoteDir(ftp,'abc123');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    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 := CkFtp2_SyncRemoteTree2(ftp,'/temp/abc123',mode,descendTree,previewOnly);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    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 := CkStringArray_Create();
CkStringArray_LoadFromText(sa,CkFtp2__syncPreview(ftp));

fac := CkFileAccess_Create();

numFiles := CkStringArray_getCount(sa);
i := 0;

while (i < numFiles) do
  begin
    localFilePath := CkStringArray__getString(sa,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 := CkFileAccess_FileDelete(fac,localFilePath);
    if (success <> True) then
      begin
        Memo1.Lines.Add('Failed to delete: ' + localFilePath);
      end;

    i := i + 1;
  end;

success := CkFtp2_Disconnect(ftp);

CkFtp2_Dispose(ftp);
CkStringArray_Dispose(sa);
CkFileAccess_Dispose(fac);

end;