(Delphi DLL) Unzip Encrypted Text into a String Variable

Demonstrates how to open an encrypted .zip archive and unzip a text file directly into a string variable.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
zip: HCkZip;
success: Boolean;
entry: HCkZipEntry;
lineEndingBehavior: Integer;
srcCharset: PWideChar;
strCsv: PWideChar;

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

zip := CkZip_Create();

// Set the password required for decrypting.
CkZip_putDecryptPassword(zip,'myPassword');

success := CkZip_OpenZip(zip,'encrypted.zip');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkZip__lastErrorText(zip));
    Exit;
  end;

// Locate the file within the Zip to be unzipped into a string variable:
entry := CkZip_FirstMatchingEntry(zip,'*.csv');
if (CkZip_getLastMethodSuccess(zip) = False) then
  begin
    Memo1.Lines.Add('No matching entry found.');
    Exit;
  end;

// lineEndingBehavior:
// 0 = leave unchanged.
// 1 = convert all to bare LF's
// 2 = convert all to CRLF's
lineEndingBehavior := 0;
srcCharset := 'utf-8';

strCsv := CkZipEntry__unzipToString(entry,lineEndingBehavior,srcCharset);
Memo1.Lines.Add(strCsv);
CkZipEntry_Dispose(entry);

CkZip_Dispose(zip);

end;