(Delphi ActiveX) Unzip Some Files by Iterating over Entries

Demonstrates how to unzip specific files by iterating over entries in a .zip.

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;
sbFilename: TChilkatStringBuilder;
numEntries: Integer;
i: Integer;
entry: IChilkatZipEntry;
entryFilePath: WideString;

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

zip := TChilkatZip.Create(Self);

// Open a .zip containing:
// 
// a1.xml
// b1.xml
// c1.xml
// dir1/a2.xml
// dir1/c2.xml
// dir2/dir3/c3.xml

// We wish to unzip only a1.xml, b1.xml, and c1.xml
success := zip.OpenZip('qa_data/zips/xml_files.zip');
if (success <> 1) then
  begin
    Memo1.Lines.Add(zip.LastErrorText);
    Exit;
  end;

sbFilename := TChilkatStringBuilder.Create(Self);

numEntries := zip.NumEntries;
i := 0;
while i < numEntries do
  begin
    entry := zip.GetEntryByIndex(i);

    entryFilePath := entry.FileName;
    Memo1.Lines.Add(entryFilePath);

    if (entry.IsDirectory = 0) then
      begin
        sbFilename.SetString(entryFilePath);
        if (sbFilename.Contains('/',0) = 0) then
          begin
            // Does not contain "/"
            // Unzip to the qa_output directory.
            success := entry.Extract('qa_output');
            if (success = 0) then
              begin
                Memo1.Lines.Add('Failed to unzip ' + entryFilePath);
              end
            else
              begin
                Memo1.Lines.Add('Unzipped ' + entryFilePath);
              end;
          end;
      end;

    i := i + 1;
  end;
end;