Pascal (Lazarus/Delphi)

Encrypt Already Existing Zip

See more Zip Examples

To encrypt an already existing non-encrypted .zip, the application must open the .zip, set the encryption related properties, and then re-write. 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.Zip;

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

procedure RunDemo;
var
  success: Boolean;
  zip: TZip;
  numFilesUnzipped: Integer;

begin
  success := False;

  //  This requires the Chilkat Zip API to have been previously unlocked.
  //  See Unlock Chilkat Zip for sample code.

  zip := TZip.Create;

  //  Open an unencrypted .zip
  success := zip.OpenZip('qa_data/zips/test.zip');
  if (success <> True) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Unzip to a temp directory.
  numFilesUnzipped := zip.Unzip('qa_output/tmp');
  if (numFilesUnzipped < 0) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Clear the zip object.
  zip.NewZip('qa_output/aesTest.zip');

  //  Indicate that 128-bit AES encryption is to be used when writing the .zip
  zip.Encryption := 4;
  zip.EncryptKeyLength := 128;

  //  Set the password.
  zip.EncryptPassword := 'secret';

  //  Append the files.
  zip.AppendFromDir := 'qa_output/tmp';
  success := zip.AppendFiles('*.*',True);
  if (success <> True) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Write the .zip and close it.
  success := zip.WriteZipAndClose();
  if (success <> True) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');


  zip.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.