(Delphi ActiveX) Replace/Update a FIle in a .zip

Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
zip: TChilkatZip;
success: Integer;
entry: IChilkatZipEntry;
zip2: TChilkatZip;

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

// First prepare a .zip and write it..
zip := TChilkatZip.Create(Self);

zip.NewZip('qa_output/abc.zip');

// Add some files..
entry := zip.AppendString('a.txt','aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa');

entry := zip.AppendString('b.txt','bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');

entry := zip.AppendString('c.txt','cccccccccccccccccccccccccccccccccccc');

// Write to qa_output/abc.zip
// This .zip contains three files: a.txt, b.txt, and c.txt
success := zip.WriteZipAndClose();

// -------------------------------------------------------------------
// Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
zip2 := TChilkatZip.Create(Self);
zip2.OpenZip('qa_output/abc.zip');

entry := zip2.GetEntryByName('b.txt');
entry.ReplaceString('This is the new content.  bbbbbbbbbbbbbbbbbbbbbb','utf-8');

// Write the modified .zip back to "abc.zip"
success := zip2.WriteZipAndClose();

Memo1.Lines.Add('success.');
end;