Pascal (Lazarus/Delphi)

Creates an AES Encrypted Zip with One File Unencrypted

See more Zip Examples

Demonstrates how to create an AES encrypted zip, but also containing one file that is not encrypted. The way we do it is to first create an AES encrypted zip in the usual way, and then we append an unecrypted file to it. 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.StringArray,
  Chilkat.Zip;

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

procedure RunDemo;
var
  success: Boolean;
  zip: TZip;
  saExclusions: TStringArray;
  recurse: Boolean;
  saveExtraPath: Boolean;

begin
  success := False;

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

  zip := TZip.Create;

  success := zip.NewZip('qa_output/aes_with_one_unencrypted.zip');
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Set properties to indicate that the Zip should be
  //  AES encrypted.

  //  A value of 4 indicates WinZip compatible AES encryption.
  zip.Encryption := 4;

  //  Key length can be 128, 192, or 256 bits.
  zip.EncryptKeyLength := 128;

  //  Set the password for AES encryption:
  zip.EncryptPassword := 'myPassword';

  //  Exclude the file helloWorld.txt
  //  This file will be added unencrypted to the .zip
  saExclusions := TStringArray.Create;
  saExclusions.Append('helloWorld.txt');
  zip.SetExclusions(saExclusions);

  zip.VerboseLogging := True;

  //  Add a directory tree to be zipped.
  recurse := True;
  //  Append from a directory relative to our current working directory.
  zip.AppendFromDir := 'qa_data/filesToZip';
  success := zip.AppendFiles('*',recurse);
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  WriteLn(zip.LastErrorText);

  //  Writes qa_output/aes_with_one_unencrypted.zip
  success := zip.WriteZipAndClose();
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  ----------------------------------------------
  //  At this point, we have an encrypted .zip with all 
  //  files except for helloWorld.txt.
  //  We'll add helloWorld.txt (unencrypted) to the .zip we just created.

  //  The NewZip method only initializes the Zip object -- it does
  //  not create or write a .zip file.

  success := zip.NewZip('notUsed.zip');
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  saExclusions.Clear();
  zip.SetExclusions(saExclusions);

  //  No encryption.
  zip.Encryption := 0;

  zip.AppendFromDir := 'qa_data/filesToZip';

  //  Add a reference to a file.  This is the file that will
  //  be added to a already-existing .zip.  
  saveExtraPath := False;
  success := zip.AddFile('helloWorld.txt',saveExtraPath);
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Appends the contents of the zip object to the preExisting.zip
  //  zip archive.  preExisting.zip is opened, and the files
  //  referenced by this zip object are streamed in, compressed,
  //  and appended to the end of the archive.
  success := zip.QuickAppend('qa_output/aes_with_one_unencrypted.zip');
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  WriteLn('Success!');


  zip.Free;
  saExclusions.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.