(Delphi ActiveX) Unzip Text File to String

Demonstrates how to open a .zip and extract the 1st file (assuming it's a text file) to a string variable.

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;
fileContents: WideString;

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

zip := TChilkatZip.Create(Self);

success := zip.OpenZip('qa_data/zips/EC16100.zip');
if (success <> 1) then
  begin
    Memo1.Lines.Add(zip.LastErrorText);
    Exit;
  end;

// Get the 1st file in the .zip
entry := zip.GetEntryByIndex(0);
if (zip.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add('No files in this zip.');
    Exit;
  end;

fileContents := entry.UnzipToString(0,'utf-8');
Memo1.Lines.Add(fileContents);
end;