Unzip an Encrypted Zip

Demonstrates how to open an encrypted .zip archive and unzip.

Download Chilkat 32-bit Zip ActiveX (.msi) (includes objects for .zip, .gz, .bz2, and .Z)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    ChilkatZip2Lib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
zip: TChilkatZip2;
success: Integer;
unzipCount: Integer;

begin
zip := TChilkatZip2.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := zip.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(zip.LastErrorText);
    Exit;
  end;

//  Set the password required for decrypting.
zip.DecryptPassword := 'myPassword';

success := zip.OpenZip('encrypted.zip');
if (success <> 1) then
  begin
    ShowMessage(zip.LastErrorText);
    Exit;
  end;

//  Returns the number of files and directories unzipped.
unzipCount := zip.Unzip('c:/unzipDir');
if (unzipCount < 0) then
  begin
    ShowMessage(zip.LastErrorText);
  end
else
  begin
    ShowMessage('Success!');
  end;
end;