(Delphi ActiveX) Unzip Selected Files from a Zip Archive

Demonstrates how to iterate over the files contained within a .zip and unzip specific files.

Note: This example requires Chilkat v11.0.0 or greater.

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
success: Integer;
zip: TChilkatZip;
unzipDir: WideString;
n: Integer;
entry: TChilkatZipEntry;
i: Integer;

begin
success := 0;

// 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('my_files.zip');
if (success = 0) then
  begin
    Memo1.Lines.Add(zip.LastErrorText);
    Exit;
  end;

unzipDir := '/temp/unzipDir';

// Get the number of files and directories in the .zip
n := zip.NumEntries;

entry := TChilkatZipEntry.Create(Self);

i := 0;
while i < n do
  begin

    zip.EntryAt(i,entry.ControlInterface);
    if (entry.IsDirectory = 0) then
      begin
        // (the filename may include a path)
        Memo1.Lines.Add(entry.FileName);

        // Your application may choose to unzip this entry
        // based on the filename.
        // If the entry should be unzipped, then call Extract(unzipDir)
        success := entry.Extract(unzipDir);
        if (success = 0) then
          begin
            Memo1.Lines.Add(entry.LastErrorText);
            Exit;
          end;

      end;
    i := i + 1;
  end;
end;