(Delphi DLL) Unzip Selected Files from a Zip Archive

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

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;
unzipDir: PWideChar;
n: Integer;
entry: HCkZipEntry;
i: Integer;

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

zip := CkZip_Create();

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

unzipDir := '/temp/unzipDir';

// Get the number of files and directories in the .zip
n := CkZip_getNumEntries(zip);
Memo1.Lines.Add(IntToStr(n));

for i := 0 to n - 1 do
  begin

    entry := CkZip_GetEntryByIndex(zip,i);
    if (CkZipEntry_getIsDirectory(entry) = False) then
      begin
        // (the filename may include a path)
        Memo1.Lines.Add(CkZipEntry__fileName(entry));

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

CkZip_Dispose(zip);

end;