Merge Zip Archives - Append .zip onto another .zip

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

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

Demonstrates how to use the QuickAppend method to append the contents of one .zip archive to another .zip archive. This method works by editing the target .zip -- it does not rewrite the target .zip. It does not recompress (or re-encrypt) the data in either archive. It is the fastest way to append additional files or data to a pre-existing large .zip archive.

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

...

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

  end;

//  Open the .zip archive that is to be appended to target.zip.
//  You should open the smaller of the two .zip archives here --
//  to minimize the amount of data to be copied.  When the .zips
//  are merged, nothing is recompressed.  The compressed (and
//  possibly encrypted) data is simply appended to the end
//  of the target .zip.
success := zip.OpenZip('zipToBeAppended.zip');
if (success <> 1) then
  begin
    ShowMessage(zip.LastErrorText);

  end;

//  Appends the contents of this zip object to the target.zip
//  archive.  After calling QuickAppend, target.zip will contain
//  both its original contents as well as the contents of
//  "zipToBeAppended.zip".
success := zip.QuickAppend('target.zip');
if (success <> 1) then
  begin
    ShowMessage(zip.LastErrorText);

  end;

ShowMessage('Success!');


end;