Delphi DLL

Unzip Files in a Date Range

See more Zip Examples

Demonstrates how to use the Zip.MinDate and Zip.MaxDate properties to unzip only those files with a last-modified date within a date range.

Note: This example requires Chilkat v10.0.0 or greater.

Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
zip: HCkZip;
numUnzipped: Integer;

begin
success := False;

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

zip := CkZip_Create();

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

// The MinDate and MaxDate properties use the timestamp date/time string format.
// Here are some examples:
// YYYY-MM-DD (e.g., 2024-07-31)
// YYYY-MM-DDTHH:MM:SS�HH:MM (e.g., 2024-07-31T12:34:56+02:00)
// 2024-07-31T12:34:56Z (the "Z" denotes Zulu time, or UTC)

// Only unzip files having a last-modified date greater than 1-Jan-2017
CkZip_putMinDate(zip,'2017-01-01T00:00:00Z');

// Also, only unzip files having a last-modified date less than the end of 2020
CkZip_putMaxDate(zip,'2020-12-31T23:59:59Z');

// You don't need to specify both MinDate and MaxDate.
// You can specify only one or the other if needed.

// The MinDate/MaxDate properties apply to all of the Chilkat methods for unzipping.

numUnzipped := CkZip_Unzip(zip,'c:/temp/unzipDir');
if (numUnzipped < 0) then
  begin
    Memo1.Lines.Add(CkZip__lastErrorText(zip));
    Exit;
  end;

CkZip_CloseZip(zip);

CkZip_Dispose(zip);

end;