(Delphi DLL) 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 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, StringBuilder, ZipEntry, Zip;

...

procedure TForm1.Button1Click(Sender: TObject);
var
zip: HCkZip;
success: Boolean;
sbFilename: HCkStringBuilder;
numEntries: Integer;
i: Integer;
entry: HCkZipEntry;
entryFilePath: PWideChar;

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

zip := CkZip_Create();

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

sbFilename := CkStringBuilder_Create();

numEntries := CkZip_getNumEntries(zip);
i := 0;
while i < numEntries do
  begin
    entry := CkZip_GetEntryByIndex(zip,i);

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

    if (CkZipEntry_getIsDirectory(entry) = False) then
      begin
        CkStringBuilder_SetString(sbFilename,entryFilePath);
        if (CkStringBuilder_Contains(sbFilename,'/',False) = False) then
          begin
            // Does not contain "/"
            // Unzip to the qa_output directory.
            success := CkZipEntry_Extract(entry,'qa_output');
            if (success = False) then
              begin
                Memo1.Lines.Add('Failed to unzip ' + entryFilePath);
              end
            else
              begin
                Memo1.Lines.Add('Unzipped ' + entryFilePath);
              end;
          end;
      end;
    CkZipEntry_Dispose(entry);

    i := i + 1;
  end;

CkZip_Dispose(zip);
CkStringBuilder_Dispose(sbFilename);

end;